Anthocyanins, Vibrant Color Pigments, and Their Role in Skin Cancer Prevention
by
, , , , ,
Zorița Diaconeasa
1,2,*,†
,
Ioana Știrbu
2,3,†, 
Jianbo Xiao
4,5,
Nicolae Leopold
3,
Zayde Ayvaz
6
,
Corina Danciu
7,
Huseyin Ayvaz
8,
Andreea Stǎnilǎ
1,2,
Mǎdǎlina Nistor
1,2 and 
Carmen Socaciu
1,2 
1
Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, 400372 Cluj-Napoca, Romania
2
Institute of Life Sciences, University of Agricultural Sciences and Veterinary Medicine, Calea Mănăştur 3-5, 400372 Cluj-Napoca, Romania
3
Faculty of Physics, Babeș-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania
4
Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Taipa, Macau 999078, China
5
International Research Center for Food Nutrition and Safety, Jiangsu University, Zhenjiang 212013, China
6
Faculty of Marine Science and Technology, Department of Marine Technology Engineering, Canakkale Onsekiz Mart University, 17100 Canakkale, Turkey
7
Victor Babes University of Medicine and Pharmacy, Department of Pharmacognosy, 2 Eftimie Murgu Sq., 300041 Timisoara, Romania
8
Department of Food Engineering, Engineering Faculty, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Biomedicines 2020, 8(9), 336; https://doi.org/10.3390/biomedicines8090336
Submission received: 31 July 2020
/
Revised: 24 August 2020
/
Accepted: 25 August 2020
/
Published: 9 September 2020
(This article belongs to the Special Issue Diabetes and Cancers)
Abstract
:Until today, numerous studies evaluated the topic of anthocyanins and various types of cancer, regarding the anthocyanins’ preventative and inhibitory effects, underlying molecular mechanisms, and such. However, there is no targeted review available regarding the anticarcinogenic effects of dietary anthocyanins on skin cancers. If diagnosed at the early stages, the survival rate of skin cancer is quite high. Nevertheless, the metastatic form has a short prognosis. In fact, the incidence of melanoma skin cancer, the type with high mortality, has increased exponentially over the last 30 years, causing the majority of skin cancer deaths. Malignant melanoma is considered a highly destructive type of skin cancer due to its particular capacity to grow and spread faster than any other type of cancers. Plants, in general, have been used in disease treatment for a long time, and medicinal plants are commonly a part of anticancer drugs on the market. Accordingly, this work primarily aims to emphasize the most recent improvements on the anticarcinogenic effects of anthocyanins from different plant sources, with an in-depth emphasis on melanoma skin cancer. We also briefly summarized the anthocyanin chemistry, their rich dietary sources in flowers, fruits, and vegetables, as well as their associated potential health benefits. Additionally, the importance of anthocyanins in topical applications such as their use in cosmetics is also given.
1. Introduction
Today, it is a generally accepted concept that including fruits and vegetables in our daily diet is beneficial for the prevention of a vast array of human diseases. Accordingly, numerous studies based on the hypothesis of the therapeutic potential of fruits and vegetables, as well as several medicinal plants, have been conducted. Following a diet that consists of fruits and vegetables has been associated with a lower frequency of diagnosed patients suffering from several pathologies such as obesity, cardiovascular and neurological diseases, diabetes, Alzheimer’s disease, and finally, yet importantly, cancer, due to their high content in phytochemicals, such as polyphenols [1,2,3]. Phytochemicals are secondary plant metabolites, known to stimulate plant reproduction as well to protect against pathogens and phytochemistry, including a systematic study of phytochemicals which has been of significant interest to researchers in the last decades [4].
Incontrovertible evidence of various health benefits arising from incorporating anthocyanins in our diet was presented by many researchers. The worldwide interest of the research community in respect to biochemical and biological aspects of anthocyanins has considerably increased not only due to their wide therapeutic potential but also due to their anticarcinogenic effects. Currently, the potential health benefits of these extraordinary molecules are strongly related to their potent antioxidant activity. Recent studies involving anthocyanin-based extracts carried out in vitro and in vivo, along with the epidemiological studies, have granted these pigments potential anticarcinogenic properties.
The most abundant compounds with antioxidant potential in the human daily diet are represented by polyphenols. There are over 15,000 polyphenols identified in nature, widely distributed not only among fruits and vegetables but also in different types of grains, oils, alcoholic and non-alcoholic beverages [5]. They may protect against an array of chronic diseases or even various cancers, as exhibited in some pre-clinical, clinical, and epidemiologic studies [1]. However, the nature and the underlying mechanisms of the most protective effects of polyphenols are still under investigation [6]. Dietary polyphenols have gained the attention of researchers worldwide owing to their antioxidant potential. They are able to protect the human organism from free-radical-induced damage to DNA and defend against the harmful UV radiation or pathogen aggressiveness. The most common polyphenols in plants that have proved potential health benefits are the well-known class of flavonoids. Furthermore, anthocyanins are natural-occurring plant pigments which are included in this class. Nearly 700 different anthocyanins have been discovered in nature [7], and they are considered the vastest and probably the most remarkable category of water-soluble pigments occurring in plants [8]. These natural plant pigments grant the color palette of flowers, leaves, fruits, and some vegetables. The red, blue, magenta, purple, and orange colors are the result of the conjugates bonds in anthocyanins structure, which are able to absorb the light at wavelengths around 500 nm [1]. The wide range of hues which an anthocyanin solution may present is not only the consequence of the pH variations. In this regard, the various structural patterns of anthocyanins play a key role as well the proportions of these diverse forms, particularly the flavylium cation under red appearance, the quinonoidal bases under violet appearance, the colorless solution or sulfite adducts, and the chalcones, which appear as yellow [9]. However, the phenomenon called “copigmentation” is the one that can offer a more elaborate explanation for the diversity of anthocyanin-derived colors observed in nature. To date, anthocyanins have had multiple applications, not only in different industrial branches, such as the textile industry, where they are used as natural colorants, but in the health sector as well, where they serve as bioactive components in the form of nutraceuticals [10].
Recently, several studies have focused on the anthocyanins’ potential, especially their anticarcinogenic potential; and numerous publications have shown the positive effects of this family of flavonoids in cancer therapy. However, to the best of our knowledge, there have been only two review papers published on the anticancer effect of anthocyanins. One of these papers overviewed the improvements on the anticancer activities of anthocyanins and the associated molecular mechanism, without targeting a specific type of cancer [11]. The other review paper was written on the preventative and inhibitory effects of anthocyanins on a specific kind of cancer: colorectal cancer [12]. On the other hand, a review paper on natural polyphenols as anticancer agents for skin cancer was recently published [1]. However, this study reviewed the polyphenols, focusing not on anthocyanins but other phenolics such as ellagitannins, quercetin, and resveratrol in purified forms (excluding total extracts and fractions). Their chemopreventive effects against skin cancer metastasis were illustrated by reviewing 34 in vivo mechanistic studies. Still, there is no comprehensive review of the anticarcinogenic effects of dietary anthocyanins on skin cancers available in the literature.
One of the leading causes of deaths among patients diagnosed with cancer is represented by skin cancer. This type of cancer is the most encountered type of cancer in the United States [13]. Depending on the cell type, skin cancers are divided into two types: cutaneous melanoma and non-melanoma. Although cutaneous melanoma, also known as malignant melanoma, is not very common compared to other skin cancers (prevalence rate of about 4%), it is the most deadly malignancy (responsible for the 80% of mortality of skin cancer), and the number of young patients diagnosed with melanoma increases faster than the number of patients diagnosed with any other types of cancer [1]. Malignant melanoma starts in melanocytes at the basal layer of the epidermis, which are the cells specialized for producing the brown pigment called melanin. Melanocytes are part of the basal cell layer of the epidermis, but they can be found in the eye as well [14]. On the other hand, non-melanoma skin cancer originates from keratinocytes of epidermis, and this cancer is also grouped into two categories: basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). As opposed to the low prevalence and high mortality of malignant melanoma, BCC is the most prevalent type of skin cancer with a low mortality rate due to its low probability to metastasize [1].
One of the most critical environmental factors for melanoma development is the UV light exposure, and the risk considerably increases in lightly pigmented skin compared to darkly pigmented skin, and as people become aged [15]. To date, several in vitro studies conducted on melanoma cell lines have demonstrated that anthocyanins have the ability to induce apoptosis [16], block the cell cycle at G0/G1 phase [17], increase the oxidative stress [18], decrease the cell viability [19], cell proliferation [20] and tumor progression [21]. Moreover, the polyphenol concentrated extract from acerola was used to examine the skin-lightening effect on brownish guinea pigs, which had been subjected to controlled UVB irradiation. The results showed that an oral administration of the applied treatment effectively lightened the pigmented skin of guinea pigs. This effect might have mainly been because of the suppression of melanin biosynthesis by inhibiting the tyrosinase activity in melanocytes [22].
In this review, we aim to provide an up-to-date overview regarding anthocyanins as functional molecules and their chemopreventive effects on melanoma in vitro and in vivo as well as a comprehensive description of major sources of anthocyanins.
2. Anthocyanins’ Chemistry
Anthocyanins are water-soluble vacuolar pigments that occur ubiquitously in the plant kingdom, and they are widely distributed in fruits and vegetables as glycosides, having different sugars, such as glucose, rhamnose, xylose or arabinose, attached to an aglycon nucleus [23]. Basically, anthocyanins are glycosylated or acylglycosylated forms of polyhydroxy or polymethroxy molecules, derivates of 2-phenylbenzopyrylium cation [24] (Figure 1).
They present a characteristic chemical structure, having a carbon chain (C6—C3—C6) where an intermediate heterocyclic ring divides the two aromatic rings. Anthocyanin molecules may contain variations in the number of hydroxyl groups or different degrees of methylation [27]. The rich structural diversity of anthocyanins is also sustained by their nature, number, and position of sugar molecules bound to aromatic rings, as well as their nature and number of aliphatic or aromatic acids attached to sugars [27]. The sugar components of anthocyanins are usually conjugated to the anthocyanidin skeleton via the C3-hydroxyl group in ring C [28].
Anthocyanins are unstable molecules, and they are prone to degradation. There are several factors which may influence the color stability of anthocyanins, such as temperature, pH, enzymes activity, light, oxygen, chemical structure, anthocyanin concentration, and also the presence of complex compounds such as other flavonoids, phenolic acids, copigments, sugars and metal ions [10]. The stability of the colored structural forms of the anthocyanins and their vibrant colors is the result of copigmentation [29]. The copigmentation occurs due to molecular associations between pigments and other usually uncolored organic molecules present in the solutions that are often reported as cofactors [30]. Unlike other flavonoids, the anthocyanins carry a positive charge in acidic solution [28]. In acidic conditions, anthocyanins appear as red but turn to blue when the pH increases [10]. They all present the basic flavylium cationic structure at low pH values, and they can be distinguished from one another by the occurrence of different substituents in ring B [31].
The most common anthocyanin aglycones, also called anthocyanidins, found in plants include delphinidin (De), cyanidin (Cy), petunidin (Pt), peonidin (Pn), pelargonidin (Pg), and malvidin (Mv) [32]. Cyanidin has the highest proportion in tissues of plants (50%), followed by pelargonidin (12%), peonidin (12%), delphinidin (12%), petunidin (7%), and malvidin (7%). Nevertheless, these aglycones by themselves are very stable and convert to anthocyanins via glycosylation [10]. These structural variations among anthocyanins and anthocyanidins may influence their anticancer efficiency [20] Although a previous study demonstrated that anthocyanidins caused more potent growth inhibition of human hepatoma cell lines than anthocyanins [33], another study reported that both anthocyanins and their aglycones selectively inhibited the tumor growth [34]. Other biological effects influenced by the structural differences between anthocyanins and their aglycones are related to their antioxidant activities and bioavailability [18].
Although there has been an abundant number of studies available regarding the protective effects of dietary anthocyanins against health problems such as myocardial infarction, cardiovascular diseases, and cancer-related mortality, the exact mechanism is still complicated and not fully elucidated yet. Accordingly, a good grasp of how anthocyanins proceed in the human body from their consumption to their absorption, distribution, metabolism, and excretion is also crucial. In order to show their effect, anthocyanins need to be present in blood circulation and tissues upon their consumption through the diet. This is also known as “bioavailability,” indicating that a part of the dietary anthocyanins digested reaches the general circulation and specific locates and becomes available to exert their functions. Earlier, anthocyanins were considered to have deficient levels of bioavailability, such as between 0.26 and 1.8% in animal studies [35,36,37,38,39,40]. Nevertheless, a relevant study tracking the isotopically labeled cyanidin-3-glucoside in humans has further clarified the anthocyanin metabolism in the human body, reporting a remarkable higher recovery level of anthocyanins (12.4%) [40]. The authors stated that this unexpectedly higher bioavailability of the specific anthocyanin could be due to newly identified metabolites.
Once ingested, anthocyanins travel through the gastrointestinal tract, including stomach, small intestine, large intestine (fecal elimination), portal vein, liver, general circulation, organs, and tissues as well as being discarded through urine. As opposed to other flavonoids, previous studies have revealed that the glycosides follow a unique pattern and can be present in the human circulation after a few minutes of anthocyanin glycosides intake (reaching 100nM within 0.5–2 h and disappearing from the bloodstream in less than 6 h), indicating the intact anthocyanin absorption from the stomach [40,41,42]. Animal studies also validated the effective absorption of anthocyanins from the stomach [43,44,45]. However, the small intestine is the major part where anthocyanin absorption occurs. Various factors, including the type of aglycone, sugar moiety, or acylated groups and the presence of other flavonoids, may alter the anthocyanin absorption rate, and the extent [46,47]. Still, monitoring the intact anthocyanins may not be the best approach to evaluate the level of anthocyanin absorptions. Several studies evaluating the bioavailability of the anthocyanins have reported that along with the anthocyanins, their conjugates, and other related metabolites such as a variety of phenolic acids, might be present in the plasma [42,48]. In one human study, 35 anthocyanin metabolites were determined after labeled cyanidin-3-glucoside intake, with 17 being in the bloodstream, 31 in urine, and 28 in feces [48]. Indeed, the concentrations of phenolic acid metabolites detected in the bloodstream were remarkably higher than those of their parent anthocyanins. Thus, the health benefits of orally administered dietary anthocyanins could be due to these higher rates of metabolites [41]. On the other hand, some anthocyanins can reach the colon in substantial amounts. These anthocyanins go through decomposition there in the large intestine by the present microbiota [41]. A previous study demonstrated the hydrolyzation of the anthocyanin glycosides in intestinal microflora within 20 min to 2 h [49]. Furthermore, some studies conducted in rats and pigs in the literature also showed that anthocyanins could reach the liver, eye, and brain tissue [43,50].
3. Anthocyanins, as Part of the Daily Human Diet
A key factor for maintaining human homeostasis is food intake, but more importantly, the nature of the food, which constitutes our diet [51]. As mentioned earlier, evidence regarding the potential health benefits provided by the consumption of fruits and vegetables was reported by many researchers. In these studies, the biggest challenge was to identify the specific compounds responsible for the health benefits. Then, the new fields of research turned their attention towards flavonoid compounds [52], mainly on anthocyanins. In the flavonoid-rich foods ingested, anthocyanins represent a large subclass [53]. Almost all berry types are abundant in anthocyanins, as well as many other dark-colored fruits and vegetables (Figure 2) [54,55,56,57], fruit-derived products such as juices, wines, and jams. Table 1, Table 2 and Table 3 summarize major flowers, berries, and vegetables as sources of anthocyanins and their quantitative occurrence, respectively.
In 2007–2008, the National Health and Nutrition Examination Survey reported the estimated dietary intake of anthocyanins to be ~11.6 ± 1.1 mg/d for individuals aged ≥20 years [1]. This number is significant compared with other flavonoids ingested, such as genistein, quercetin, and apigenin, whose daily intake was estimated at only 20–25 mg [58]. However, anthocyanin intake largely depends on dietary habits. For instance, only one serving of berries can significantly increase daily anthocyanin intake. Additionally, the daily intake of anthocyanins can be estimated from 500 mg to 1 g if flavonoid supplements are included in the diet [59].
Another important subject to discuss, considering that anthocyanins are found in a significant amount in edible foods, is their toxicity. So far, no adverse effects of anthocyanins associated with their normal dietary intake have been reported [60]. Moreover, evaluations concerning anthocyanin toxicity suggest that adverse effects may occur only if anthocyanins are ingested at extremely high levels [61]. Certainly, further complex toxicological assessments are necessary in order to have complete data regarding side-effects of different concentrations of anthocyanins. To date, there is no specific level of anthocyanin intake to be recommended for optimal health benefits; therefore, this could be a new field of research, considering the consumer demands for natural health-promoting ingredients growing to a greater extent [61].
4. Rich Sources of Anthocyanins
4.1. Flowers
Including edible flowers in the human diet has recently become a trend, although they have been part of human nutrition since ancient times. They are considered plant foods which proved their medicinal use during the time, as well as the various health-promoting effects, due to their content of bioactive compounds such as phenolic compounds. Various species of edible flowers are consumed as ingredients in different meals, salads or drinks. They are widely used in tea infusions as well, due to their curative properties. Reports have shown that edible flowers contain anthocyanins (Figure 3) with a wide range of functional properties, e.g., antioxidant activity. For example, species of edible flowers used as greens in salads, such as Nasturtium and Morning glory, were reported to present high anthocyanin content [62,63]. Cyanidin-3-O-glucoside was identified as the major anthocyanin in culinary herbs such as purple basil [64,65]. Derivates of petunidin and delphinidin were identified in saffron [66,67]. Anthocyanins were also identified in various species widely used for tea infusions, such as delphinidin derivates in Clitoria ternatea L. [68,69], cyanidin 3,5-di-O-glucoside in edible rose and cyanidin-3-o-sambubioside and delphinidin-3-O-sambubioside in Hibiscus sabdariffa [70]. Cyanidin derivates were identified in flowers as well, such as Clemantis [71], Chinese herbaceous peony [72], or Plumeria rubra [73] with medicinal use. In Table 1, the major anthocyanins and their concentrations in flowers are outlined.
Table 1.
Rich sources of anthocyanins found in flowers.
| Source | Major Anthocyanin Reported | Total Anthocyanins Content mg/100 g FW * | Total Anthocyanins Content mg/100 g DW ** | Ref. |
|---|---|---|---|---|
| Purple basil (Ocimum basilicum L.) | Cyanidin-3-O-glucoside | [70] | ||
| Purple basil Ocimum basilicum L. Purple Ruffles | Cyanidin-based, p-coumaryl acid | 0.0127 | [64] | |
| Butterfly peas (Clitoria ternatea L.) | Delphinidin derivates | NR *** | NR | [74] |
| Butterfly peas (Clitoria ternatea L.) | Delphinidin-3-O-malonyl-glucoside | NR | NR | [74] |
| Butterfly peas (Clitoria ternatea L.) | Delphinidin-3-O-(6′′-O-malonyl)-β-glucoside-3′,5′-di-O-β-glucoside | NR | NR | [68] |
| Camelia (Camelia cv Dalicha) | Cyanidin-3-O-(2-O-β-xylo- pyranosyl)-β-galactopyranoside Cyanidin-3-O-(2-O-β-xylopyranosyl-6-O-(z)-p-coumaroyl)-β-galactopyranoside | NR | NR | [75] |
| Camelia (Camelia cv
| Cyanidin-3-O-(6-O-(e)-p-coumaroyl)-β-glucopyranoside Cyanidin-3-O-(6-O-(e)-p-coumaroyl)-β-galactopyranoside | 5.6± 1.6 5.6± 2.2 48.5± 24.2 26.9± 6.0 20.5± 1.5 | NR | [76] |
| Saffron (Crocus sativus) | Delphinidin-3,7-O-diglucoside | 480 ± 2.33 | [66] | |
| Saffron (Crocus antalyensis) | 3,7-di-O-β-d-glucoside of delphinidin Petunidin-3,7-di-O-(β-d-glucopyranoside) Delphinidin-3-O-(β-d-glucopyranoside)-5-O-(6-O-malonyl-β-d-glucopyranoside | NR | NR | [67] |
| Saffron (Crocus etruscus) | Delphinidin-3,5-di-O-β-glucoside Petunidin-3,5-di-O-β-glucoside | [77] | ||
| Chrysanths (Chrysanthemum Dendranthema grandiflorum Ramat. cv Angel) | Cyanidin-3-(3ʹʹ-malonoyl)glucoside | NR | 1386± 3.9 | [78] |
| Chrysanths (Chrysanthemum grandiflorum
| Cyanidin-3-O-(6″-O-malonylglucoside) Cyanidin-3-O-(3″,6″-O-dimalonylglucoside) | NR | NR | [79] |
| Clematis (Clematis
| Cyanidin-3-O-β-(2′′-e-caffeoylglucopyranosyl)-(1 --> 2)-O-β-galactopyranoside-3′′-O-β-glucuronopyranoside Cyanidin-3-O-β-(2′′-e-caffeoylglucopyranosyl)-(1 --> 2)-O-β-(6′′-malonylgalactopyranoside)-3′-O-β-glucuronopyranoside Cyanidin-3-O-β-(2′-e-feruloylglucopyranosyl)-(1 --> 2)-O-β-(6′′-malonylgalactoside)-3′-O-beta-glucuronopyranoside | NR | NR | [71] |
| Clematis (Clematis cv. Jackmanii Superba Fujimusume) | Delphinidin-3-O-β-[(2”-trans-caffeoylglucopyranosyl)-(1 --> 2)-(6”-succinylgalactopyranoside)]-7-O-β-glucopyranoside Delphinidin-3-O-β-[(2”-trans-caffeoylglucopyranosyl)-(1 --> 2)-(6”-trans-caffeoyl-tartaroyl-malonylgalactopyranoside)]-7-O-β-glucopyranoside Delphinidin-3-O-β-[(2”-trans-caffeoylglucopyranosyl)-(1 --> 2)-(6”-trans-caffeoyl-tartaroyl-malonylgalactopyranoside)]-3′-O-β-glucuronopyranoside | NR | NR | [80] |
| Carnation (Dianthus caryophyllus) | 3, 5-di-O-(β-glucopyranosyl) pelargonidin-6”-O-4, 6”-O-l-cyclic 3, 5-di-O-(β-glucopyranosyl) cyanidin-6”-O-4, 6”-O-l-cyclic malate | NR | NR | [81] |
| Carnation (Dianthus caryophyllus cv.
| Pelargonidin-3,5-cyclicmalyldiglucoside Cyanidin-3-O-malylglucoside Pelargonidin-3,5-diglucoside | NR | NR | [82] |
| Carnation (Dianthus caryophyllus cv.
| Delphinidin-3,5-diglucoside-6”-O-4, 6”-O-1-cyclic-malyl diester | NR | NR | [83] |
| Carnation (Dianthus caryophyllus cv.
| Cyanidin-3,5-d-O-glucosides Cyanidin-3-O-(6-O-malyl glucoside)-5-O-glucoside | NR | NR | [84] |
| Edible roses (An ning) | Cyanidin-3,5-di-O-glucoside | 353.56 ± 2.50 | [2] | |
| Edible violet (Viola tricolor L.) | Delphinidin-3-(4”-p-coumaroyl)-rutinoside-5-glucoside | [85] | ||
| Freesias (Freesia hybrida) | Malvidin-3-O-glucoside | NR | [86] | |
| Roselle (Hibiscus sabdariffa) | Delphinidin-3-O-sambubioside Cyanidin-3-O-sambubioside | NR | NR | [87] |
| Delphinidin-3-O-sambubioside Cyanidin-3-O-sambubioside | NR | [68] | ||
| Morning glory (Ipomoea tricolor Cav.) | Peonidin-3-O-sophoroside-5-O-glucoside Peonidin-3-O-(2-O-(6-O-(trans-caffeoyl)-β -glucopyranosyl)-6-O-(trans-caffeoyl)-β-glucopyranoside)-5-O-(β glucopyranoside) Peonidin-3-O-(2-O-(β-glucopyranosyl)-6-O-(trans-caffeoyl)-β- glucopyranoside)-5-O-(β-glucopyranoside) | NR | NR | [68] |
| Leopard lily (Iris cv.
| Delphinidin-3-O-(cis-p-coumaroyl)rutinoside-5-O-glucoside Delphinidin-3-O-(trans-p-coumaroyl)-rutinoside-5-O-glucoside Delphinidin-3-O-(feruloyl)rutinoside-5-O-glucoside Pelargonidin-3-O-(cis-p-coumaroyl)rutinoside-5-O-glucoside Pelargonidin-3-O-(feruloyl)rutinoside-5-O-glucoside | 5.82-258.6 | [88] | |
| Japanese water iris (Iris ensata) | Malvidin-3-O-(p coumaroyl)rhamnosylglucoside-5-O-glucosides Petunidin-3-O-(p-coumaroyl)rhamnosylglucoside-5-O-glucosides | NR | NR | [89] |
| Dutch iris (Iris hollandica) | Delphinidin-3-O-(p-coumaroyl)rhammnosylglucoside-5-O-glucoside | NR | NR | [90] |
| Crimean iris (Iris lutescens) | Delphinidin-3-O-(p-coumaroylrutinoside)-5-O-glucoside | NR | NR | [1] |
| Edging lobelia (Lobelia erinus cv Rosamond) | Cyanidin-3-O-(6-O-(4-O-trans-p-coumaryl-α-l-rhamnopyranosyl)-β-d-glucopyranoside)-5- O-(6-O-malonyl-β-d glucopyranoside)-3′-O-(6-O-trans-caffeyl-β-d-glucopyranoside) Cyanidin-3-O-rutinoside-5,3′-diglucoside | NR | NR | [91] |
| Edging lobelia (Lobelia erinus cv.
| Delphinidin-3-O-p-coumaroylrutinoside-5-O-malonylglucoside-3′5′-O-dihydroxycinnamoylglucoside Delphinidin-3-O-glucoside | NR | NR | [26] |
| Meadow/bloody crane’s-bill (Geranium
| Malvidin-3-O-β-d-glucopyranoside-5-O-β-d-[6-O-acetylglucopyranoside] | NR | NR | [92] |
| Peony (Paeonia
| Peonidin-3,5-di-O-glucoside Cyanidin-3-O-glucosid | NR | NR | [93] |
Peony
| Peonidin-3,5-di-O-glucoside Cyanidin-3-O-glucoside | NR | NR | [94] |
| Petunia (Petunia hybrida
| Cyanidin-3-O-glucoside | 7.72± 0.8 µmolgFW 5.61± 0.39 | NR | [95] |
| Petunia (Petunia exserta) | Cyanidin-3-O-sophoroside Cyanidin-3-O-glucoside Peonidin-3-O-glucoside | NR | NR | [96] |
| Cyanidin-3-O-glucoside | NR | NR | [97] | |
| Petunia (Petunia hybrida) | Peonidin-3-O-(6-(6-coumaryl rhamnosyl)-glucoside)-5-O-glucoside | NR | NR | [98] |
| Red frangipani (Plumeria rubra) | Cyanidin-3-O-β-(2”-glucopyranosyl-O-β-galactopyranoside) | NR | NR | [73] |
| Pomegranate (Punica granatum) | Pelargonidin-3-O-glucoide Pelargonidin-3-O-diglucoside | NR | NR | [99] |
| Korean edible rose (Rosa hybrida cv. Noblered) | Cyanidin-3,5-di-O-glucoside | 375+_9.6 | NR | [100] |
Rosa rugosa
| Peonidin-3,5-di-O-glucoside Cyanidin-3,5-di-O-glucoside Cyanidin-3,5-di-O-glucoside | 165 ± 17.2 44.95 ± 0.38 14.01 ± 0.61 | NR | [101] |
| Nasturtium (Tropaeolum majus) | Delphinidin-3-O-dihexoside Pelargonidin-3-O-sophoroside | 245.5±167.3 880.3± 18.3 | 31.9± 21.7 114.5±17.22 | [62] |
| Nasturtium (Tropaeolum majus) | Pelargonidin-3-O-sophoroside | NR | NR | [102] |
| Marigold (Tagetes erecta) | Cyanidin-di-hexoside | NR | NR | |
| Aracress (Spilanthes oleracea) | Cyanidin-3-O-glucoside Delphinidina-3-O-glucuronide | NR | NR | |
| Tulip (Tulipa fosteriana ‘Albert heijn’) | Pelargonidin-3-O-acetylrutinoside Cyanidin-3-O-rutinoside | NR | NR | [103] |
| Blue periwinkle (Vinca. major L.) | Delphinidin-3-O-[6-O-(α-rhamnopyranosyl)-β-galactopyranoside]-7-O-(α-rhamnopyranoside) | NR | NR | [104] |
| Blue periwinkle (Vinca. minor L.) | Delphinidin-3-O-[2-O- (β-xylopyranosyl)-6-O-(α-rhamnopyranosyl)-β-galactopyranoside]-7-O-(α-rhamnopyranoside) | NR | NR | |
| Garden pansy (Viola wittrockiana) | Delphinidin-3-O-rhamnosyl-glucoside | NR | 0.57 ± 1.2 | [105] |
| Yunnan edible rose (An ning) | Cyanidin-3,5-O-diglucoside Cyanidin-3-O-glucoside | 353.56 ± 2.50 | NR | [106] |
| False shamrock (Oxalis triangularis) | Malvidin-3-O-(6-O-(4-O-malonyl-a-rhamnopyranosyl)-β-glucopyranoside)-5-O-β-glucopyranoside Malvidin-3-O-(6-O-(4-O-malonyl-a-rhamnopyranosyl)-β-glucopyranoside)-5-O-β-glucopyranoside | NR | NR | [107] |
| Malvidin-3-O-rutinoside-5-O-glucoside. | NR | NR | [108] | |
| Mavidin-3-O-(6-O-(4-O-malonyl-a-rhamnopyranosyl-β-glucopyranoside)-5-O-b-glucopyranoside | NR | [109] |
* FW—fresh weight; ** DW—dry weight; *** NR—not recorded.
4.2. Fruits and Vegetables
The current interest in dietary polyphenols is sustained by the mounting evidence that the intake of these phytochemicals has various human health benefits. Their uptake can be increased by consuming plant-based foods, which represent the primary source of polyphenols; however, these sources vary with the habitual diet. For example, polyphenols are major dietary components for people who drink red wine on a routine basis. The complexity of polyphenols lies in the potential for multiple decorations with other groups, including sugars, alcohols, and acids [110]. The most common flavonoids, a major sub-group of polyphenols, are rarely found in food without attached sugars, acids, or alcohols. Anthocyanidins, for instance, are mostly found as anthocyanins [111,112]. Anthocyanins represent a variety that has enhanced levels of specific polyphenols implicated in different therapies.
Evidently, fruits are the highest sources of anthocyanins, but vegetables make a large overall contribution to polyphenol intake as well. Among fruits, berries such as bilberry, blackberry, mulberry, and blackthorn have high anthocyanin contents. Both anthocyanin composition and concentration may vary among different varieties of berries, with variations arising from different factors such as environmental or climatic conditions. For example, wild, unripened varieties provide a source of variation and may influence their potential bioactivity. Environmental and agronomic conditions lead to inter-genotype variation. In blueberry, certain genotypes accumulate a higher proportion of acylated anthocyanins, which makes them different than other genotypes. This characteristic has a biological relevance because acylated anthocyanins improve color tone and stability in juices. However, reports suggested that they had a lower bioavailability than non-acylated anthocyanins. Strawberry and blackberry samples represent basic anthocyanin profiles, with pelargonidin-3-O-glucoside being dominant in the strawberries, and cyanidin-3-O-glucoside in the blackberries [113,114]. High anthocyanin content was reported in chokeberry by several studies, where cyanidin-3-O-galactoside was the major anthocyanin identified [115,116,117]. Cyanidin derivates were also identified in raspberry [118], mulberry [119,120], elderberry [117,121], redcurrant [122] and blackcurrant [123], along with the delphinidin derivates [124]. All those compounds identified in fruits and vegetables and their reported levels are summarized in Table 2 and Table 3, respectively.
Table 2.
Rich anthocyanin sources of fruits and berries.
| Source | Major Anthocyanin Reported | Conc. mg/100 g FW | Conc. mg/100 g DW | Conc. mg/100 mL | Ref. |
|---|---|---|---|---|---|
| Chokeberry (Aronia melanocarpa) | Cyanidin-3-O-galactoside | 900 | NR | [125] | |
| Cyanidin-3-O-galactoside | 36.7 | NR | NR | [126] | |
| Cyanidin-3-O-galactoside Cyanidin-3-O-arabinoside | NR | 8.63 | [127] | ||
| Cyanidin-3-O-galactoside | 51.3 | NR | NR | [128] | |
| Cyanidin-3-O-galactoside | NR | NR | NR | [129] | |
| Cyanidin-3-O-galactoside | 93.3 | NR | NR | [115] | |
| Cyanidin-3-O-galactoside | 906.9 | NR | NR | [130] | |
| Cyanidin-3-O-galactoside | 248.24 | NR | NR | [117] | |
| Cyanidin-3-O-galactoside | 403 | NR | NR | [131] | |
| Cyanidin-3-O-galactoside | NR | 8286.4 | NR | [132] | |
| Cyanidin-3-O-galactoside | NR | NR | 30.1 | [133] | |
| Cyanidin-3-O-galactoside | NR | 40 | NR | [134] | |
| Cyanidin-3-O-galactoside | NR | 627 | NR | [135] | |
| Cyanidin-3-O-galactoside | NR | 798.08 | NR | [126] | |
| Cranberries (Vaccinium macrocarpon) | Peonidin-3-O-galactoside | NR | 75.26 | [136] | |
| Peonidin-3-O-galactoside | NR | 255 | NR | [137] | |
| Cyanidin-3-O-arabinose | NR | 588 | NR | [138] | |
| Peonidin-3-O-glucoside | NR | NR | 20.40 | [139] | |
| Cyanidin-3-O-galactoside | 15.7 | NR | NR | [117] | |
| Bilberry (Vaccinium spp.) | Delphinidin-3-O-glucoside | 47.7 | NR | NR | [140] |
| Delphinidin-3-O-glucoside | NR | 1761 | NR | [141] | |
| Delphinidin-3-O-glucoside | NR | NR | 57.41 | [139] | |
| Cyanidin-3-O-glucoside | NR | NR | 25.68 | [127] | |
| Delphinidin-3-O-galactoside | 177.97 | NR | NR | [117] | |
| Blueberry (Vaccinium spp.) | Maldivin-3-O-galactoside | 101.88 | NR | NR | [16] |
| Maldivin-3-O-galactoside | 194 | NR | NR | [142] | |
| Maldivin-3-O-galactoside | 178 | NR | NR | [143] | |
| Cyanidin-3-O-glucoside | 282 | NR | NR | [144] | |
| Petunidin-3-O-glucoside | 77.5 | NR | NR | [118] | |
| Maldivin-3-O-galactoside, Delphinidin-3-O-galactoside | 259.2 | NR | NR | [145] | |
| Delphinidin-3-O-glucoside | NR | 143.90 ± 1.56 | [124] | ||
| Delphinidin-3-O-galactoside | 55.37 ± 26.2 | NR | NR | [117] | |
| Maldivin-3-O-hexoside | NR | 1218 | NR | [146] | |
| Maldivin-3-O-galactoside Maldivin-3-O-glucoside | 36.24 ± 0.6 | NR | NR | [147] | |
| Cyanidin glycosides | 424.2 | NR | NR | [17] | |
| Delphinidin-3-O-glucoside | NR | 1435 | NR | [1] | |
| Maldivin-3-O-galactoside | 32.8 ± 18.9 | NR | NR | [148] | |
| Delphinidin-3-O-glucoside | 32893 ± 2.47 | NR | NR | [149] | |
| Maldivin glycosides | 790.7 ± 19 | NR | [150] | ||
| Maldivin-3-O-galactoside | 286.4 ± 37.97 | NR | NR | [151] | |
| Delphinidin-3-O-glucoside | 0.172 | NR | NR | [152] | |
| Blackberry (Rubus spp.) | Cyanidin-3-O-glucoside | NR | NR | 17.28 ± 0.0088 | [119] |
| Cyanidin-3-O-glucoside | 148.9 ± 69 | NR | NR | [117] | |
| Cyanidin-3-O-glucoside | NR | 606 | NR | [153] | |
| Cyanidin-3-O-rutinoside | NR | NR | 3.735 | [154] | |
| Cyanidin-3-O-glucoside | NR | 710 ± 0.02 | NR | [155] | |
| Cyanidin-3-O-glucoside | 124.3 | NR | [114] | ||
| Delphinidin-3-O-glucoside | 647.0 ± 19.2 | NR | [118] | ||
| Cyanidin-3-O-glucoside | NR | 811.85 ± 2.76 | NR | [156] | |
| Blackcurrant (Ribes nigrum) | Cyanidin-3-O-glucoside | 6.599 | NR | NR | [157] |
| Cyanidin-3-O-glucoside | NR | NR | NR | [158] | |
| Delphinidin-3-O-rutinoside | 27.85 ± 16.0 | NR | NR | [117] | |
| Delphinidin-3-O-rutinoside | 2.653 ± 1.82 | NR | NR | [152] | |
| Cyanidin-3-O-rutinoside Delphinidin-3-O-rutinoside | NR | NR | 8.94 | [127] | |
| Delphinidin-3-O-rutinoside | NR | NR | 140.75 ± 1.77 | [134] | |
| Delphinidin-3-O-rutinoside | NR | NR | 10.163 | [154] | |
| Delphinidin-3-O-glucoside | 644 ± 113 | NR | [132] | ||
| Blackthorn (Prunus spinose) | Peonidin-3-O-rutinoside | NR | 0.034 ± 0.03 | NR | [159] |
| Cyanidin-3-O-rutinoside | NR | NR | NR | [160] | |
| Cyanidin-3-O-glucoside | 128.648 ± 116.07 | NR | NR | [161] | |
| Redcurrant (Ribes rubrum) | Cyanidin-3-O-glucoside | 1.697 | NR | NR | [157] |
| Cyanidin-3-O-xylosylrutinoside | 6.85 ± 2.8 | NR | NR | [117] | |
| Cyanidin-3-O-rutinoside | NR | NR | [158] | ||
| Cyanidin-3-O-xylosyl-rutinoside | 104 ± 1.6 | NR | NR | [122] | |
| Elderberry (Sambucus spp.) | Cyanidin-3-O-glucoside | NR | 0.3738 ± 0.147 | [131] | |
| Cyanidin-3-O-glucoside | NR | NR | NR | [162] | |
| Cyanidin-3-O-glucoside Cyanidin-3-O-sambubioside | NR | NR | NR | [163] | |
| Cyanidin-3-O-glucoside | 132.17 ± 131.9 | NR | NR | [117] | |
| Strawberry (Fragaria spp.) | Pelargonidin-3-O-glucoside | NR | 15.13 | [139] | |
| Pelargonidin-3-O-glucoside | 61.11 ± 0.13 | NR | NR | [164] | |
| Pelargonidin-3-O-glucoside | 52.22 ± 46.4 | NR | NR | [117] | |
| Pelargonidin-3-O-glucoside | 57.9 ± 3.4 | NR | NR | [165] | |
| Pelargonidin-3-O-glucoside | 736.98 ± 178.9 | NR | [166] | ||
| Pelargonidin-3-O-glucoside | 18.581 | NR | NR | [167] | |
| Pelargonidin-3-O-glucoside | 407.8 ± 16.8 | NR | NR | [118] | |
| Pelargonidin-3-O-glucoside | 21.31 ± 1.11 | NR | NR | [132] | |
| Pelargonidin-3-O-glucoside | NR | NR | 20.1 | [168] | |
| Pelargonidin-3-O-glucoside | NR | 107 | NR | [165] | |
| Pelargonidin-3-O-glucoside | 33.27 | NR | NR | [123] | |
| Mulberry (Morus spp). | Cyanidin-3-O-glucoside | NR | 669 ± 34 | NR | [130] |
| Cyanidin-3-O-glucoside | NR | NR | 49.2 ± 0.0099 | [119] | |
| Cyanidin-3-O-glucoside | 156.1 ± 42.3 | NR | NR | [117] | |
| Cyanidin-3-O-glucoside | 1.543 ± 0.06 | NR | NR | [152] | |
| Sour Cherry (Prunus cerasus L) | Cyanidin-3-O-glucosyl-rutinoside | 1269.2 ± 23.3 | NR | NR | [169] |
| Cyanidin-3-O-glucosyl-rutinoside | NR | NR | NR | [170] | |
| Cyanidin-3-O-glucosyl-rutinoside | NR | 372.84 ± 1.67 | NR | [171] | |
| Cyanidin-3-O-glucosyl-rutinoside | 39.02 | NR | NR | [172] | |
| Cyanidin-3-O-glucosyl-rutinoside | 59.75 ± 5.06 | NR | NR | [173] | |
| Cyanidin-3-O-glucosyl-rutinoside | NR | NR | NR | [174] | |
| Cyanidin-3-O-glucosyl-rutinoside | NR | NR | NR | [175] | |
| Cyanidin-3-O-glucosyl-rutinoside | NR | NR | 73.67 | [139] | |
| Raspberries (Rubus idaeus) | Cyanidin-3-O-rutinoside | NR | NR | NR | [176] |
| Cyanidin-3-O-rutinoside | NR | NR | NR | [158] | |
| Cyanidin-3-O-sophoroside | 30.56 ± 33.7 | NR | NR | [117] | |
| Cyanidin-3-O-sophoroside | NR | 233 | NR | [153] | |
| Pelargonidin-3-O-glucoside | 0.313 ± 0.01 | NR | NR | [152] | |
| Cyanidin-3-O-sophoroside | NR | 8.098 | [154] | ||
| Cyanidin-3-O-glucoside Petunidin-3-O-glucoside | 133.9 ± 8.4 | NR | NR | [118] | |
| Plums (Prunus spp.) | Peonidin-3-O-rutinoside | NR | 0.034 ± 0.03 | NR | [173] |
| Lingonberries (Vaccinium vitis-idaea) | Cyanidin-3-O-glucoside | NR | NR | 60.5 ± 0.054 | [129] |
| Cyanidin-3-O-galactoside | 34.86 ± 21.5 | NR | NR | [117] | |
| Rosehip (Rosa spp.) | Cyanidin-3-O-glucoside | NR | 0.0068 | NR | [159] |
| Cyanidin-3-O-glucoside | NR | 0.92 ± 2.6 | NR | [177] | |
| Pomegranate (Punica granatum) | Cyanidin-3,5-O-diglucoside | NR | NR | NR | [178] |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [179] | |
| Delphinidin-3,5-O-diglucoside | NR | NR | NR | [180] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | 1.471 ± 0.32 | [181] | |
| Delphinidin-3,5-O-diglucoside | NR | NR | NR | [182] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [183] | |
| Pelargodin-3,5-O-diglucoside | 17.9 ± 7.9 | NR | NR | [184] | |
| Cyanidin-3-O-glucoside | 43.99 ± 4.67 | NR | NR | [185] | |
| Cyanidin-3-O-monoglucoside | NR | NR | NR | [186] | |
| Cyanidin-3-O-glucoside | NR | 85 ± 0.02 | NR | [187] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | [188] | ||
| Cyanidin-3,5-O-diglucoside | NR | 75.78 ± 3.78 | NR | [189] | |
| Cyanidin-3-O-glucoside | NR | NR | 2.816 ± 0.56 | [190] | |
| Cyanidin-3-O-glucoside | NR | NR | NR | [191] | |
| Cyanidin-3-O-glucoside | NR | NR | NR | [192] | |
| Malvidin-3-O-glucoside | NR | 117 ± 4 | NR | [193] | |
| Figs (Ficus carica) | Cyanidin-3-O-rutinoside | 1.191 ±6.33 | NR | NR | [194] |
| Cyanidin-3-O-rutinoside | NR | NR | [195] | ||
| Cyanidin-3-O-rutinoside | 4.82 | NR | NR | [196] | |
| Gooseberry (Ribes uva-crispa) | Cyanidin-3-O-glucoside | 37.79 ± 38.1 | NR | NR | [117] |
| Delphinidin-3-O-rutinoside | 61.19 | NR | NR | [197] | |
| Cyanidin-3-O-glucoside | 0.957 ± 1.66 | NR | NR | [157] | |
| Cyanidin-3-O-glucoside | 37.79 | NR | NR | [117] | |
| Acai (Euterpe oleracea) | Cyanidin-3-O-rutinoside | NR | 106.7 ± 125.95 | NR | [198] |
| Cyanidin-3-O-glucoside | 57 ± 0.39 | NR | NR | [199] | |
| Cyanidin-3-O-glucoside | NR | NR | [200] | ||
| Acerola (Malpighia emarginata) | Cyanidin-3-O-rhamnoside, Pelargonidin-3-O-rhamnoside | 12 ± 0.03 | NR | NR | [201] |
| Maqui (Aristotelia chilensis) | Delphinidin-3-O-glucoside | 715 ± 0.12 | NR | NR | [202] |
| Delphinidin-3-O-glucoside | 4235 ± 0.08 | NR | [203] | ||
| Cyanidin-3-O-sambubioside-5-O-glucoside+ Cyanidin-diglucoside | 2610 | NR | NR | [204] | |
| Delphinidin-3-O-glucoside-5-O-glucoside | NR | 1278 | NR | [205] | |
| Delphinidin-3-O-glucoside | 789 ± 0.14 | NR | NR | [206] | |
| Blood orange (Citrus × sinensis) | Cyanidin-3-O-(6″-malonyl glucoside) | NR | 1.20 ± 0.02 | [207] | |
| Red apples | Cyanidin-3-O-galactoside | 73.94 ± 31.7 | NR | NR | [208] |
| Cyanidin-3-O-galactoside Cyanidin-3-O-glucoside | NR | NR | NR | [209] | |
| Cyanidin-3-O-galactoside | 21.32 | NR | NR | [210] | |
| Cyanidin-3-O-galactoside | NR | NR | NR | [211] | |
| Dogberry (Cornus mas) | Cyanidin-3-O-rutinozit chloride | NR | NR | 342 | [212] |
| Cyanidin-3-O-galactoside | 123.5 ± 19.7 | NR | NR | [213] | |
| Peonidin-3-O-glucoside | 103.37 ± 5.77 | NR | NR | [214] | |
| Cyanidin-3-O-galactoside | 104.66 | NR | NR | [215] | |
| Pelargonidin-3-O-glucoside | NR | 1403 | NR | [216] | |
| Pelargonidin-3-O-glucoside | NR | NR | 38 ± 0.052 | [131] |
Table 3.
Rich anthocyanin sources of vegetables.
| Source | Major Anthocyanin | Conc. mg/100 g FW | Conc. mg/100 g DW | Conc. mg/100 mL | Ref. |
|---|---|---|---|---|---|
| Native Andean Potatoes (Solanum tuberosum, stenotonum, phureja and chaucha) | Petunidin-3-coumaroylrutinoside-5-glucoside Pelargonidin-3-coumaroylrutinoside-5- glucoside | NR | NR | NR | [217] |
| Red onion (Allium cepa) | Cyanidin-3-(6”-malonylglucoside) | 3.012 ± 1.62 | NR | NR | [218] |
| Cyanidin-3-(6”-malonyl)-glucopyranoside | 29.99 ± 1.19 | NR | NR | [156] | |
| Peonidin-3-O-glucoside | NR | 0.19 | NR | [219] | |
| Red cabbage (Brassica oleracea var. capitata f. rubra) | Cyanidin-3,5-O-diglucoside | NR | 232 | NR | [220] |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [221] | |
| Cyanidin-3,5-O-diglucoside | NR | 629 ± 0.25 | NR | [222] | |
| Cyanidin-3,5-O-diglucoside | NR | 588.44 ± 146.5 | NR | [223] | |
| Cy 3-(feruloyl)diglucoside-5-glucoside | 34.28 ± 1.60 | NR | NR | [224] | |
| Cyanidin-3,5-O-diglucoside | NR | 630 ± 0.09 | NR | [225] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [226] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [227] | |
| Cyanidin-3-(sinapoyl)-O-diglucoside-5-O-glucoside | NR | NR | NR | [228] | |
| Cyanidin-3,5-O-diglucoside | NR | NR | NR | [229] | |
| Cyanidin-3-coumaroyl-dihexoside-5-hexoside | 23.93 ± 1.02 | NR | NR | [230] | |
| Cyanidin-3-(sinapoyl)-O-diglucoside-5-O-glucoside | NR | NR | NR | [231] | |
| Cyanidin derivates | NR | 73.1 ± 203 | NR | [232] | |
| Purple corn (Zea mays indurata) | Cyanidin-3-O-glucoside | NR | NR | [233] | |
| Cyanidin-3-O-glucoside | NR | 38.035 ± 3.39 | NR | [234] | |
| Cyanidin-3-O-glucoside | NR | NR | [235] | ||
| Cyanidin-3-O-glucoside | NR | 83.45 ± 11.44 | NR | [236] | |
| Cyanidin-3-O-glucoside | NR | 350 | NR | [237] | |
| Cyanidin-3-(6”-malonylglucoside) | NR | 4000 ± 0.3 | NR | [238] | |
| Cyanidin-3-O-glucoside | NR | 140.69 ± 68.92 | NR | [239] | |
| Cyanidin-3-O-glucoside | NR | 3.081 | NR | [240] | |
| Cyanidin-3-O-glucoside | NR | NR | [241] | ||
| Purple carrot (Daucus carota subsp. sativus) | Cyanidin-3-xylosyl(feruloylglucosyl)-galactoside | NR | 1986 ± 0.36 | NR | [242] |
| Cyanidin-3-O-glucoside | 290 | NR | NR | [243] | |
| Cyanidin-3-xylosyl(feruloylglucosyl)galactoside | 82.2 ± 0.14 | NR | NR | [244] | |
| Cyanidin-3-xylosyl(feruloylglucosyl)galactoside | NR | NR | [245] | ||
| Radicchio (Cichorium intybus) | Cyanidin-3,5-di-O-(600-O-malonyl)-glucoside | NR | NR | [246] | |
| Cyanidin-3-O-(600-malonyl)-glucoside | NR | NR | [247] | ||
| Cyanidin-3- O -(6”- O -malonyl)-glucoside | 54.9 | NR | NR | [248] | |
| Cyanidin-3-O-(6”-O-malonyl)-glucoside | NR | NR | [249] | ||
| Cyanidin-3-O-(6”-Omalonyl)- glucoside | 51.15 ± 23.5 | NR | NR | [250] | |
| Purple asparagus (Asparagus officinalis) | Cyanidin-3-O-rutinoside | 3.34 ± 5.28 | NR | NR | [251] |
| Purple kale (Brassica oleracea) | Cyanidin-3-(sinapoyl)diglucoside-5- glucoside | NR | NR | NR | [252] |
| Rhubarb (Rheum rhabarbarum) | Cyanidin-3-O-glucoside Cyanidin-3-O-rutinoside | NR | 341.1 ± 41.6 | NR | [8] |
| Red radish (Raphanus raphanistrum subsp. sativus) | Pelargonidin-3-O-(6-O-p-coumaroyl-2-O-feruloyl)-sophoroside-5-O-(6-O-malonyl)-glucoside | NR | NR | NR | [253] |
| Cyanidin-3-O-sophoroside-5-O-glucoside | NR | NR | NR | [254] | |
| Pelargonidin-3-diglucoside-5 (malonyl)-glucoside | NR | NR | NR | [255] | |
| Black beans (Phaseolus vulgaris) | Petunidin-3-O-glucoside | 206 | NR | NR | [256] |
| Cyanidin-3-O-glucoside | NR | NR | NR | [257] | |
| Black rice (Oryza sativa) | Cyanidin-3-O-glucoside | 123.9 ± 31 | NR | NR | [258] |
| Cyanidin-3-O-glucoside | NR | 140.4 ± 336 | NR | [259] | |
| Cyanidin-3-O-glucoside | NR | 41692 ± 0.36 | NR | [260] | |
| Delphinidin-3-O-galactoside | NR | 74 | NR | [261] | |
| Cyanidin-3-O-glucoside | NR | NR | 278 | [262] | |
| Cyanidin-3-O-glucoside | NR | NR | NR | [263] | |
| Kohlrabi (Brassica oleracea Gongylodes Group) | Cyanidin-3,5-O-diglucoside | NR | NR | NR | [221] |
| Cyanidin-3-(caffeoyl) p-coumaroyl (sinapoyl) diglucoside-5-glucoside | NR | 302 ± 0.21 | NR | [264] | |
| Cyanidin-3-(sinapoyl)-diglucoside-5-glucoside | NR | 2.3 | NR | [265] | |
| Cyanidin-3-(feruloyl) diglucoside-5-glucoside | NR | 30 ± 0.01 | NR | [266] | |
| Eggplant (Solanum melongena) | Delphinidin-3-glucoside-5-(coumaryl) dirhamnoside | NR | 110 | NR | [267] |
| Delphinidin-3-O-rutinoside | 4810 | NR | NR | [268] | |
| Malvidin 3-(p-coumaroyl)rhamnoside(glucoside)-5-glucoside | 202.6 ± 0.286 | NR | [269] | ||
| Malvidin-3-rutinoside-5-glucoside | NR | NR | NR | [270] | |
| Artichoke (Cynara cardunculus) | Cyanidin-3-(6′-malonylglucoside) | NR | 124 ± 0.04 | NR | [271] |
| Purple sweet potato (Ipomoea batatas) | Peo-3-caffeoyl-feruloylsoph-5-glucoside | NR | 83.8 ± 0.4 | NR | [272] |
| Cyanidin-3-caffeoyl-p-hydroxybenzoyl sophoroside- 5-glucoside | NR | NR | [273] | ||
| Peonidin 3-caffeoyl-p-hydroxybenzoyl-sophoroside-5-glucoside | NR | 714 ± 0.28 | NR | [274] | |
| Peonidin-3-(6”-caffeoyl-6”‘-p-hydroxybenzoylsoph)-5-glucoside | NR | 68.4 | NR | [264] | |
| Peonidin-3-caffeoyl-p-hydroxybenzoyl sophoroside-5-glucoside | NR | NR | [248] | ||
| Peonidin-3-(caffeoylferuloyl sophoroside)-5-glucoside | NR | 730.3 ± 99.1 | NR | [275] | |
| Peonidin-3-caffeoyl-feruloyl sophoroside-5-glucoside | NR | NR | [276] | ||
| Cyanidin-3-(6”- caffeoyl-feruloyl sophoroside)-5-glcucoside | NR | 455.08 | NR | [277] | |
| Peonidin-3-(6”caffeoyl-6”‘p-hydroxybenzoyl sophoroside)-5-glucoside | NR | NR | [101] |
5. Anthocyanins’ Potential for Health Benefits
Anthocyanins have been known as therapeutic agents in traditional medicine, which indicates their protective effects against various diseases in humans [5]. For instance, anthocyanins from Hibiscus sp. have been used effectively in folk medicines as a remedy for liver dysfunctions and hypertension [278]. Similarly, anthocyanins from Vaccinum sp. have been used in the treatments of visual disorders and microbial infections [279]. Despite their well-known therapeutic effects, conclusive studies regarding the pharmacological properties of anthocyanins have only been recently studied [16,32,280].
Recent in vivo studies have suggested the anthocyanins’ potential to protect against liver dysfunction, improve eyesight, provide anti-inflammatory and antimicrobial effects, decrease the level of blood pressure, and provide anti-proliferative effects on tumor cells [52] as well as prevent obesity and diabetes [281]. Epidemiological studies have shown that including rich sources of anthocyanins in daily diet is correlated with reducing the risk of many chronic diseases such as hyperlipidemia, cardiovascular diseases, Alzheimer’s disease, and various types of cancer, including breast, colon and ovarian cancer [282,283]. The anti-inflammatory effects are notable, considering inflammation plays a key role in the carcinogenesis in animals, and probably in humans [284]. Moreover, anthocyanins have been shown to protect from DNA cleavage, estrogenic activity, enzyme inhibition, lipid peroxidation, decreasing capillary permeability, and membrane strengthening [285,286,287].
Currently, the potential health benefits of anthocyanins are strongly related to their antioxidant activity [288]. Due to their phenolic structure, anthocyanins are potent antioxidants in vitro. They are capable of scavenging the free-radicals, which are responsible for increased oxidative stress [289].
Reactive oxygen species are typically generated in the body. However, if they are overly produced, they can lead to cellular damage, which further leads to inflammations, cardiovascular diseases, cancer, and premature aging [290]. The antioxidant activity of these pigments is of particular importance at neutral pH because pH in the human body is generally neutral, except in the stomach [289]. As reported previously [291], the ability of free-radical scavenging is particularly due to anthocyanin chalcones and quinoidal bases with a double bond conjugated to the keto group. Moreover, the glycosylated B-ring in the structure of anthocyanins are highly effective regarding their antioxidant activity, where ortho-hydroxylation and methoxylation significantly increase the antioxidant activity [292]. Several in vitro studies have reported the antioxidant effect of anthocyanins when conducted on the colon [293,294], endothelial [295], liver [296], breast [226,239], leukemic [123] and keratinocytes [297], cervical [280] and melanoma [124] cell lines. In these studies, anthocyanins have shown to exhibit multiple anticarcinogenic effects from scavenging reactive oxygen species to reducing cell proliferation, from stimulating the expression of Phase II detoxification enzymes to inhibiting mutagenesis by environmental toxins and carcinogenesis, among others. Anthocyanins possess the hydroxyl groups in both position 3 of ring C and also in the 3′, 4′, and 5′ positions in ring B in their chemical structure. This pattern provides powerful antioxidant activity. Generally, anthocyanin aglycones are better at radical scavenging compared to anthocyanins. However, their radical scavenging activity diminishes as sugar fraction enhances [28].
Anthocyanins were also shown to possess strong metal chelators and reducing agents. In a study, purified and standardized ethanolic extracts of 10 varieties of elderberry fruits, which were high in cyanidin aglycone, were examined for iron and copper chelating and reducing activities [298]. The authors reported that cyanidin, cyanidin-3-glucoside as standards and all the extracts of elderberry fruits could chelate iron and also reduced both iron and copper. However, the standards and the extracts were found to be poor in chelating copper. Among the varieties of elderberries, variations in metal chelating and reducing properties were also observed.
The role of anthocyanins in preventing cardiovascular diseases is strongly related to oxidative stress protection. The oxidative stress induces a cellular redox imbalance, which often occurs in some types of cancer, and it is related to oncogene stimulation. Oxidative damage leads to genetic mutations that represent the first step of mutagenesis, carcinogenesis, and aging [55]. That being said, the latest studies have emphasized the potential health benefits of active compounds from different natural sources and suggested some useful applications for controlling the pathogenesis of chronic diseases caused by oxidative stress.
Anthocyanins have been shown to exhibit a variety of biological activities leading to their anticarcinogenic properties depending on the different substituents on their B-rings. Based on the relevant studies in the literature, including the use of various cancer cell lines, animal models and human clinical trials, anthocyanins have been shown to have an antitumor or anticancer role throughout the tumorigenesis and carcinogenesis, from the initial stage of tumorigenesis to cancer formation and cancer development stages. These roles have been extensively explained elsewhere [11]. The authors in the previous review paper grouped the activities of anthocyanins as an antioxidant, anti-inflammation, anti-mutagenesis for the initial stage of tumorigenesis; differentiation induction, inhibiting cellular transformation, cell proliferation, and signaling pathways from blocking signal transduction and regulating the expression of anti-oncogenes and relevant proteins in the cancer formation stage; inducing apoptosis of tumor cells, inhibiting angiogenesis of tumors in the cancer development stage and reducing the expression of cell adhesion and influencing the expression of components for extracellular matrix degradation to inhibit the invasion and metastasis of tumors. The authors also reported that the anthocyanins could reverse the multidrug resistance of cancer. However, the metabolism of anthocyanins is still uncertain [11]. In this context, we are presenting an overview of published data about anthocyanin potential in human health, focusing mainly on melanoma treatment, along with other types of cancers taking both in vivo and in vitro studies into consideration.
6. Anthocyanins Involvement in Cancer Prevention
Cancer is one of the most controversial and frequently debated topics, and it is one of the leading causes of global mortality. Today, many studies focus on finding novel methods for cancer prevention. Over the years, various pharmaceuticals have been extensively used in cancer therapy. Chemotherapy, for instance, is one of the conventional treatments commonly recommended to patients with metastatic tumors. However, nearly all anticancer drugs do not target rapidly proliferating cells. Therefore, they have the potential of life-threatening side effects, often limiting their efficient use due to the high risk of alteration of healthy tissues and organs. This may lead to severe consequences, such as blood cell aplasia as a consequence of chemotherapy, secondary immunodeficiency, deterioration of the detoxify cation function of the liver, and many others. Thus, developing novel anticancer agents with a lower level of toxicity remains a priority for the worldwide scientific community. The association of a diet rich in fruits and vegetables with a lower occurrence of several types of human cancer is a largely accepted concept. It has been reported that phytochemicals such as polyphenols from fruits and vegetables are able to induce apoptosis in cells or cell arrest in cancerous cells, while showing little or no toxic effects [299]. The organism could reap the benefits of these properties only if there is a combination of phytochemicals included in our diet since pure or limited compounds are not enough for maximum efficiency [20]. The detrimental effects of conventional cytostatic towards healthy tissues can be attenuated with the help of auxiliary therapy. Phenolic compounds such as anthocyanins play an important role in antitumor therapy via bioactive compounds. Previous in vivo, in vitro or clinical studies, have reported that anthocyanins have the ability to decrease the proliferation of cancerous cells and to inhibit the development of tumors [293,294,296,300,301,302]. Some studies found that anthocyanins and their aglycones were able to inhibit the growth of tumor cells, whilst the growth of healthy cells was little or not affected at all [303,304]. Nevertheless, their anticancer effects may vary among different cancer cell lines. Antimetastasis agents have been recognized as a novel category of cancer chemopreventive agents. Reports have suggested that cyanidin and pelargonidin sourced from blackberry or strawberry exert chemopreventive activity [305,306,307].
Recently, the interest of the worldwide scientific community on the biochemical aspects and biological effects of anthocyanins has substantially expanded, in response to the evidence demonstrating not only their broad therapeutic potential but also those that may have beneficial anticarcinogenic effects. In fact, various studies have proved their anticarcinogenic and anti-proliferative effects, as well as their role as chemopreventive agents. Several anthocyanin-based extracts from different plant sources have been shown to exhibit anti-proliferative activity towards multiple cancer cell types in vitro [124,300]. Cell proliferation was found to be inhibited by the ability of anthocyanins to block various stages of the cell cycle via effects on cell cycle regulator proteins [308].
The process of programmed cell death, also known as “apoptosis”, plays a significant role in maintaining the homeostasis among normal cell populations. Apoptosis potently suffers malfunctions in cancer cells; thus, some of the most efficient chemopreventive agents have been designed to induce apoptosis in premalignant and malignant cells [1]. Anthocyanin-rich extracts from berries and grapes have been found to exhibit proapoptotic effects when tested on various cancer cell lines [305]. Likewise, anthocyanins extracted from purple-fleshed sweet potato have been shown to have beneficial effects against colorectal cancer via apoptotic mechanisms. The treatment significantly inhibited aberrant crypt foci formation in the colons of female CF-1 mice, which has been correlated with a higher expression of apoptotic caspase-3 in the colon mucosal epithelial cells [309]. Similarly, a recent study investigated the effect of purple sweet potato anthocyanins on the proliferation of bladder cancer cell line BIU87. The data obtained showed that purple sweet potato anthocyanins could inhibit the bladder cancer BIU87 cell growth via apoptosis [250].
Another study has also demonstrated that anthocyanin extract of purple potato, through TNF-related apoptosis-inducing ligand, stimulates the maturation of acute myeloid leukemia cells. Moreover, anthocyanins from wine sources have been reported to have an anti-invasive property in human hepatoma Hep3B cells [310]. The effects of anthocyanins were also investigated on human lung cancer [21]. In this study, the potential of anthocyanins from fruits of Vitits coignetiae Pulliat to inhibit cell proliferation, invasion, and angiogenesis in human lung cancer A549 cells was investigated. These results bring evidence that the extract might have anticancer effects on human lung cancer. All these studies provide clear information about all chemopreventive, proapoptotic, and anti-proliferative effects of anthocyanins against various types of cancer. Moreover, these results demonstrate that anthocyanins are effective in vitro for many types of cancer.
Among all these types of cancer, melanoma is the one that is less studied; however, it is one of the most aggressive types. In this context, our next section will be focused on in vitro studies examining anthocyanins’ role in melanoma treatment.
7. Anthocyanins as Potential Agents for Melanoma Prevention
Skin cancer can be defined as the relentless division of cancer cells in the skin. There are three different types of skin cancers. The most common cancer in humans is basal cell carcinoma (BCC), which belongs to a non-melanoma subset, together with squamous cell carcinoma (SCC). The third major category of skin cancer is represented by melanoma (Figure 4). Merkel cell tumors and dermatofibrosarcoma protuberans are also considered as cancer types. Melanoma represents a type of skin cancer that starts in melanocytes. Melanocytes are the cells that can become a melanoma, and they are specialized pigment-producing cells found in both the basal layer of the epidermis and in the eye [14]. The number of patients diagnosed with melanoma has been increasing faster than the number of patients diagnosed with any other type of cancer [311].
Over 200,000 of new cases of melanoma and 50,000 of related deaths were registered worldwide in 2012, making the melanoma ranked at 15th among common cancers worldwide [312]. Currently, 132,000 melanoma skin cancers occur globally each year, one in every three cancer cases being diagnosed as skin cancer (WHO). The incidence of cutaneous melanoma varies markedly among regions; these variations being strongly correlated to the racial skin phenotype and the level of sun exposure. Unlike other cancers, melanoma mainly affects young and middle-aged individuals, with the median age at diagnosis being 57 years [313]. Analyzing the statistics related to sex, women cases occur more frequently in younger aged categories, while men prevail from the age of 55 onwards [314]. Most of the patients are diagnosed at an early stage. For these patients, surgical excision is curative in the majority of cases [315]; however, there is the risk of relapse.
On the other hand, approximately 10% of melanoma cases are diagnosed when the disease has already reached an advanced stage, when they are often already metastatic [313]. Therefore, cutaneous melanoma represents one of the most aggressive forms of skin cancer due to its incredible ability to spread and grow [313]. Malignant tumors are composed of cancer cells, having the ability to invade nearby normal tissues. These types of tumors entail the degradation of the extracellular matrix, cell metastasis, and proliferation. It is biologically the most aggressive form of skin cancer because it is spreading rapidly to other body parts, usually in five phases, each of which is characterized by specific molecular aberrations [316,317] such as the overexpression of proteolytic enzyme activity, such as matrix metalloproteinases, as well as the detaching and migration of tumor cells into the bloodstream or lymph nodes from where they can spread to any other tissue or organ [318].
Over the past decade, the strategies to improve melanoma treatment were notably advanced. Researchers have been focused on a deeper understanding of the essential mechanisms involved in melanoma development and its biology. Due to the increasing incidence of melanoma in the United States, most of the studies aimed to develop more efficient drugs with lower toxicity in order to prevent and treat melanoma. Experimental approaches have used agents that modify tumor growth by inducing terminal differentiation [319].
The most vital role of the skin is to protect the body from environmental aggressions. The skin has epidermal units which are composed of a melanocyte surrounded by keratinocytes and regulated by a closed paracrine system. The epidermal units are responsible for melanogenesis. Melanogenesis is defined as a complex process that involves different stages through melanin synthesis and distribution [320]. Besides determining skin color and some phenotypic aspects, melanin plays an essential role in protecting the skin against ultraviolet light. Increased levels of melanin in the epidermis lead to hyperpigmentation, which can cause severe skin damages such as melasma, lentigo, or post-inflammatory hyperpigmentation [321]. Although melanocytes represent only 1% of total epidermal cells, they are responsible for melanin synthesis. These cells can be found in the basal layer of the epidermis as well in the choroidal layer of the eye [322]. Melanin is transferred to keratinocytes, where it acts as protection against solar radiation [318]. Although the knowledge of melanocyte biology has made remarkable progress, there is still much to be clarified. Investigating the mechanism of melanogenesis is critical for developing photoprotective measures, which reduce photoaging and photocarcinogenesis. Although there are no 100% curative treatments for melanoma yet, efficient results can be achieved by early diagnosis. Prevention has the main role in detecting melanoma in order to prevent more advanced stages.
The most important external factor for melanoma skin cancer development is exposure to UV radiation. It is well-known that excessive exposure to UV radiation leads to premature skin aging, hyperkeratosis, and premalignant lesions [323]. The increased risk of melanoma development due to sun exposure is directly associated with the UV level, particularly the UVB spectrum (280–320 nm) [324]. Exposure to these types of radiations has been demonstrated to initiate inflammatory pathways and oxidative damage in the epidermis and dermis, leading to an increased risk of skin cancers, including risk for the development of melanoma [325]. Moreover, UVA radiation (320–400 nm), even though less powerful than UVB radiation, has the ability to penetrate deeper into the skin layers [300].
The increasingly high number of patients diagnosed with skin cancer has led to high demand for finding active compounds that can efficiently fight against UVR-induced skin damage [325]. Other factors critical for the development of melanoma are the number of congenital and acquired melanocytic nevi along with the genetic susceptibility and family history [326,327,328]. Contrary to belief, no other environmental factors, such as tobacco/smoke addition, have been associated with melanoma [311]. Currently, early diagnosis is the main option for curing this disease, while prevention strategies are mandatory in spotting the disease at earlier and more curable stages [329].
Including biochemotherapy and biological agents into the classical treatment has been shown to be more effective than traditional treatments, which are based only on chemotherapy alone [330,331,332,333,334]. Most anticancer treatments are originated from natural resources, including marine, microbial, and botanical sources [335]. Natural supplements and a diet rich in antioxidants for the purpose of the complementary medication are the current topics of related research. Several studies have demonstrated that flavonoids and anthocyanins are suitable candidates for the prevention of the adverse effects of UV radiation due to their UV absorbing property and antioxidant properties. Table 4 summarizes the positive biological effects of anthocyanins in vivo. There are different available cell lines to create animal models of cancers. In the case of melanoma, there are different melanoma cell lines, for instance, melanoma B16F10 (metastatic), B16F0 (non-metastatic), which all derived from C57Bl/6 mice; B16-F0 being the parent cell line. The B16F10 model is very aggressive at the biological level, much more than the B16F0, which remains close to the parental B16 one and grows slowly.
Anthocyanins can act [336] as immune response stimulators, or they can induce gene suppression or block oxidative damage to DNA [337,338]. One study demonstrated that blackberry anthocyanins could reduce UV mediated oxidative injury in skin keratinocytes [339]. Bog blueberry anthocyanins have been found to possess protective effects against UVB-induced skin photoaging. This action occurs by blocking collagen destruction and inflammatory responses via transcriptional mechanisms of NF-κB (nuclear factor-kappaB) along with MAPK signaling [340]. The photoprotective properties of strawberry were previously shown in human dermal fibroblasts. One of the effective and reliable inhibitory solutions is natural bioactive compounds, such as anthocyanins, which are known for having an inhibitory effect on melanogenesis in human melanocytes [336].
In plants, anthocyanins gather in the vacuoles of epidermal cells. These pigments were associated with the protective effects against solar radiation a long time ago. Considering the photoprotective effects of anthocyanins in plants, researchers have started from the hypothesis that similar effects may be shown on human skin [325]. The photoprotective role of the anthocyanins is increased by the flavylium cation form of anthocyanins, strongly absorbing UV light [341]. Anthocyanins have strong absorptions in both visible and ultraviolet regions in the electromagnetic spectrum, particularly in the 505–550 and 280–320 nm ranges [342]. Anthocyanins sourced from purple sweet potato were included in the formulation of a cosmetic product at a concentration of 0.61 mg/100 g of cream, and they were able to absorb almost half of the UV radiation (46%) in vitro [343]. This has revealed that even low concentrations of anthocyanins may limit the amount of UVB radiation interacting with the epidermis, indicating the benefits of anthocyanins in preventing UV-induced skin damage. Another study has reported the protective effects of anthocyanins from black soybean coats both in in vitro keratinocytes and in vivo hairless mice [344]. A clinical study also stated that a formulation including anthocyanins and glutathione were found to be efficient in lowering the skin erythema caused by radiation therapy in breast cancer patients [345]. However, more studies are required to determine the most effective dose and response in clinical trials, as well as to clarify the effectiveness of anthocyanins as photoprotective compounds.
The studies have been focused on the antioxidant and detoxifying properties of anthocyanins as well as their effects on decreasing the rate of cell replication and thus controlling tumor growth [346]. Reports have shown that phenolic fractions inhibit melanogenic activity and decrease the development of melanoma cells [346]. This data suggest anthocyanins’ potential as therapeutic agents regarding the treatment of human melanoma. Many studies, both in vitro and in vivo, have been done on demonstrating the effects that anthocyanins, derived from various plant sources, have on different melanoma cell lines. It is well known that B16–F10 melanoma cells are a highly invasive metastatic cell line. A study reported that anthocyanin-rich fraction of blueberries has the ability to inhibit proliferation, stimulate apoptosis, and increase lactate dehydrogenase leakage activity in B16-F10 melanoma murine cells, after 24 h of treatment [16].
Another study proved that mulberry anthocyanin extract prevents atherosclerosis and inhibits melanoma metastasis [31]. The applied treatment with mulberry anthocyanin extracts on B16-F1 cells revealed within Western blotting assay that the expression levels of Ras, phosphoinositide 3-kinase (PI3K), phospho-Akt, and nuclear factor kappa B (NF-κB) were reduced after 24 h. Moreover, it was suggested that mulberry anthocyanin extracts could mediate B16-F1 cell metastasis by reduction of MMP-2 and MMP-9 activities involving the suppression of the Ras/ PI3K signaling pathway. They also carried out experiments in vivo, of B16-F1 melanoma cells being injected into the right groin of the C57BL/6 mice, and the mice were fed with the same mulberry anthocyanin extracts. The immunohistochemistry stain results and also hematoxylin-eosin stain showed that the applied treatment inhibited the metastasis of B16- F1 cells in vivo.
Table 4.
Anthocyanins from different food matrices and their positive biological effects against melanoma.
Table 4.
Anthocyanins from different food matrices and their positive biological effects against melanoma.
| Cell Line | Anthocyanins Sources | Conc. | Biological Effect | Ref. |
|---|---|---|---|---|
| C1 41 | Black Raspberry | 0–100 μg/mL | ↓tumor progression | [347] |
| B16-F1 | Mulberry | 0–5 mg/mL | ↓cell proliferation ↓viability | [31] |
| B16 | Cyanidin-3-α-O-rhamnoside Pelargodin-3- α-O-rhamnoside | 0–20 μg/mL | ↓melanin content ✓skin-lightening ↓tyrosinase activity | [25] |
| MeOMEZlan-a mouse melanocytes | Red wine | 4–500 mg/L | ↓melanogenic activity ↓tyrosinase activity | [346] |
| TVM-A12 | Cyanidin-3-O-β-glucopyranoside | 5/10 µM | ↓cell proliferation induced ✓morphological differentiation | [319] |
| B16-F1 | Mulberry | 0–3 mg/mL | ↓cells proliferation | [31] |
| B16 | Liriope platyphylla | 0–500 μg/mL | ↓tyrosinase activity ↓melanin content | [348] |
| B16-F10 | Blueberry | 0–800 μg/mL | ✓antioxidant activity ↓cells proliferation ✓apoptosis ↑LDH activity | [19] |
| A375 | Hibiscus sabdariffa Linn. | 5–50 mg/mL | ↓ melanin synthesis ↓tyrosinase activity | [349] |
| B16-F10 | Strawberry | ↓cell proliferation | [55] | |
| B16-F10 | Blueberry and blackcurrant juices | 0–500 µg/mL | ↓cell proliferation | [21] |
| B16-F10 | Delphinidin | 10 μg/mL | ↓endothelial cells proliferation | [295] |
| B-16 | Fructus Sorbi acupariae | 5 mL/kg | ✓antitumor activity ✓antimetastatic activity ↑stromal progenitor cells | [350] |
| A375, A549 | Rubus fairholmianus | 10–40 µg/mL | ↓cell proliferation ↓viability ↑cytotoxicity ✓apoptosis | [351] |
| A375, B16-F10 | Chokeberry, red grape | 0–400 µg/mL | ↓cell proliferation ↑oxidative stress biomarkers ↓Δψ | [21] |
| B16-F10 | Blueberry | 0–800 μg/mL | ↓viability ↓cell proliferation ✓blocked cell cycle G0/G1 phase ✓apoptosis | [20] |
| A375 | Houttuynia cordata Thunb | 25–200 μg/mL | ↓viability ↓cell proliferation ✓apoptosis | [352] |
| B16-F10 | Elderberries | ↓cell proliferation ↑LDH activity | [20] | |
| B16-F10 | Dendrobium | 0–120 μg/mL | ↓cell viability ↑melanin inhibition ↑enzyme inhibition | [353] |
| WM35 | Origanum vulgare | 0–4 μg/mL | ↓cell viability | [22] |
| B16-F1 | Hibiscus sabdariffa calyx | 0–1 mg/mL | ↓cell growth ↓ migration ↓tube formation ↓MMP–2/–9 and VEGF ↓migration and angiogenesis | [354] |
↑- increase activity, ↓-decrease activity, ✓- poses this actitivy.
Anthocyanins are the most important type of flavonoids and widely distributed phenolic compounds in strawberry. A study investigated the antiproliferative activity of anthocyanin-rich strawberry extracts on the B16–F10 murine melanoma cell line [51], which provided preliminary data for the ability of the extract to inhibit the growth and induce differentiation in a melanoma cancer cell line. Treatment of melanoma cells with the extract has affected several parameters of melanoma cells, proving the antitumor activities on the highly metastatic B16-F10 murine melanoma cell line. Therefore, the report has clearly demonstrated a remarkable inhibition of cell proliferation in the treated B16-F10 cells (about 30% after 48 h and by about 27% after 72 h compared to the control application. Trypan Blue exclusion test has also revealed that the strawberry extract caused no cell injury, and the toxicity level was lower than 5% in B16-F10 cells. The same authors lately conducted another study and reported the anti-proliferative activity of extracts from cell suspensions (strawberry, strawberry tree, blackberry, and red raspberry) on murine melanoma cells. The extracts containing anthocyanins were found to reduce cell proliferation (ranging from 30% to 38% compared to the control) [355].
A further study investigated the effects of delphinidin on tumor development [295]. In vivo, delphinidin was shown to significantly decrease melanoma-induced tumor growth, while the data obtained after the in vitro experiment exhibited a decrease of endothelial cell proliferation. The influence of cyanidin-3-O-β-glucopyranoside (C-3-G) on TVM-A12 human melanoma cell line was investigated. C-3-G is widely distributed among plants and included in the diet [341]. The study investigated the effects of C-3-G on cell proliferation and morphology as well as melanin synthesis. C-3-G treatment was shown to affect cell proliferation and induce morphological differentiation. Furthermore, melanin formation and melanosome maturation were enhanced. Another study reported the photo-chemopreventive effect of delphinidin against UVB-induced biomarkers of skin cancer development [356] when tested on SKH-1 hairless mice. The results of the treatment suggested that delphinidin was able to inhibit UVB-mediated oxidative stress and reduced DNA damage, indicating that this anthocyanin may protect the cells from UVB-induced apoptosis.
Mulberry anthocyanins were investigated for their potential antimetastatic activity [350]. The data obtained suggested that mulberry anthocyanins had strong anticancer effects and inhibited the metastasis ability of B16-F1 cells. The antimetastatic effect of these compounds was also apparent in a C57BL/6 mice model.
Anthocyanins possess high antioxidant activity; however, they are highly susceptible to the impact of environmental factors. Therefore, encapsulating anthocyanin into liposomes was found to effectively stabilize these molecules. A study investigated the inhibitory effects of liposome-capsulated anthocyanin (LCA) isolated from Hibiscus sabadariffa Linn. on melanoma development in human A357 melanocytes [349]. The study demonstrated that anthocyanin with liposome encapsulation increased the stabilization of anthocyanin and the inhibition of melanogenesis.
Several studies have shown that anthocyanins exhibit antiproliferative and proapoptotic effects. Recently, a study using anthocyanin-enriched extracts (AEE) was obtained from elderberries, and the extract was used for the treatment of B16-F10 murine melanoma cells. After the treatment, AEE inhibited cell proliferation in a concentration-dependent manner and increased LDH activity. Moreover, AEE induced apoptosis of melanoma cells, confirmed by dual staining AO/EB and TUNEL assay. The data obtained in this study indicate that elderberry-derived anthocyanins may be utilized in skin cancer therapy due to their high anthocyanin content [20].
Blueberries are known for their high anthocyanin content, which has been shown to be involved in different cancer-associated processes. In a recent study, the chemopreventive potential of anthocyanin extracts from blueberry was investigated on the B16-F10 melanoma cell line. After the treatment, both anthocyanin and anthocyanidin extracts inhibited the viability and proliferation of melanoma cells. In this study, anthocyanin extract from the same berries was tested as well on murine melanoma cells, where it was found to exhibit higher cytotoxicity than anthocyanin extracts. Both extracts blocked cell cycle progression at the G0/G1 phase at a concentration lower than 400 and 200 µg/mL. The induction of apoptosis was observed using flow cytometric analysis. The data obtained shows that anthocyanin and anthocyanidin extracts might be used in order to treat skin cancer and in topical applications [17]
Anthocyanins and their aglycones have been proved to exhibit various biological effects, including anticarcinogenic potential on different types of cancer cell lines. In our latest study, the phytochemical content of nine different berry samples was investigated using liquid chromatography. The study focused on the effects of selected chokeberry and red grape anthocyanin extracts (C-ARE and RG-ARE) on melanoma cell lines. After the treatment with the extract, both C-ARE and RG-ARE anthocyanins reduced cell proliferation, increased oxidative stress biomarkers, and decreased mitochondrial membrane potential, without a negative effect on the normal cells. At the same time, RG-ARE was more effective in the treatment due to its five different aglycones. We concluded that C-ARE and RG-ARE anthocyanins might be effective in reducing cell proliferation and increasing the level of oxidative stress in cancer cells [18].
8. Anthocyanins as Functional Ingredients in Cosmetics
Along with increasing consumer preferences for products with functional ingredients, the cosmetic products embedded with polyphenols have also become more trendy. Thanks to healthy aspects of secondary plant metabolites, functional ingredients with such properties have recently become prevalent not only in cosmetics but also in pharmaceutical industries [357]. Accordingly, the number and variety of products with beneficial ingredients, also known as cosmeceuticals, are growing to meet the demand [357,358]. Based on the studies in the literature, anthocyanins were previously shown to constrain some of the reactions causing photoaging and skin diseases. The concept of selecting highly stable anthocyanins with previously reported health benefits and including them in topical applications can lead to desired properties observed in cosmetic products. However, the studies on evaluating the applications of active compounds in such products have been limited up to today. Although the benefit of such compounds to the skin was previously shown and accepted, not much is known as to penetration of these compounds to the stratum corneum (SC). Among the three layers of the skin (epidermis, dermis, and hypodermis), with a typical thickness of 10–20 μm, SC forms the outermost layer of the epidermis [359]. It is the main barrier of the skin, avoiding the water and electrolyte losses [360]. In order to be effective, anthocyanins applied in topical formulas should be released, in order to reach and overcome the SC so that it can reach the layers underneath [361]. The rate and the kinetics at which active components are released from the product and penetrate the skin depend on the molecular properties of the specific compound, including molecular weight and lipophilicity, together with the characteristics of the vehicle [362].
On the other hand, drugs can penetrate the skin through hair follicles, interfollicular sites, corneocytes, and lipid bilayer membranes [363]. The approaches for enhancing the permeation of the compounds into the skin in topical or “trans-dermal” drug delivery is a currently investigated topic for drug developers. Although the addition of some complexes may lead to better penetration of the active compounds [364], the use of the additional compounds is not commonly used since they irritate the skin at high concentrations [362].
There have been both in vitro and in vivo percutaneous studies conducted regarding the efficacy of the topical formulations on drug delivery and skin barrier properties. In one study, lipsticks with elderberry or red radish included in the formulations were evaluated for skin permeation and stratum corneum penetration in a porcine ear model [365] and yielded encouraging results. Briefly, the lipstick formulations containing anthocyanins showed their properties to act as antioxidants, and also, they were demonstrated to be effective on tyrosinase inhibition. The positive results were obtained at physiologically relevant concentrations taking the common lipstick usage within the United States. In another study, black soybean extracts were used on human skin, and the allergic response was evaluated. The results have revealed that the use of black soybean extract caused no allergic reaction on human patch trials and encouraged the potential use of such extracts high in anthocyanins as additives in cosmetic formulations for purposes such as anti-aging and whitening [366]. Another study evaluated the anthocyanins extracted from grapes and blackcurrants for skin-lightening goals by including them in the topical delivery of protein-rich formulations [367]. The authors reported no antimicrobial effect upon the use of the formula. This also supports the inclusion of anthocyanins in topical formulations.
9. Conclusions and Future Perspectives
The attention on anthocyanin research regarding human health benefits has expanded from diabetes and cardiovascular diseases to cancer in the last years. Extensive evidence has been provided about the multiple positive health effects of these bioactive compounds and their presumed mechanisms of action. There is a new trend to investigate how dietary polyphenols, especially anthocyanins, are implicated in the prevention or evolution of different chronic diseases. Rich sources of anthocyanins are represented by a large variety of fruits, vegetables, as well as various edible flowers. Phytochemical and pharmacological studies have validated the therapeutic uses of edible plants, and many reports on phytochemical composition have demonstrated that berries are rich sources of anthocyanins being effective in ameliorating various degenerative diseases. Additionally, if certain foods with particular groups of anthocyanins, as in the case of berries, are more beneficial than other fruits or vegetables is not clear yet. Anthocyanin extracts were shown to provide antioxidant effects, although the exact mechanism by which anthocyanins prevent the development of some diseases remains to be elucidated.
Moreover, the bioavailability and dosage of the extracts is yet another concern that has to be focused on. In this work, previous studies on anthocyanin content of common foods from the human daily diet have been reviewed in order to find out their current status. This review focuses on the chemopreventive activity of anthocyanins, and the most recent studies on these compounds regarding melanoma treatment are presented. Many studies suggested that anthocyanins from various plant sources exert anticarcinogenic and anti-proliferative effects and are able to reduce the damaging effects of reactive oxygen species. Recently, antimetastatic agents were defined as a new class of cancer chemopreventive agents, and several studies have demonstrated that cyanidin and pelargonidin obtained from different types of berries, exhibited chemopreventive and chemotherapeutic activity. Furthermore, the blueberry anthocyanin and anthocyanidin extracts are potential raw materials for the production of antitumor health foods and medicines.
In summary, this systematic review provides further support that anthocyanins reduce the risk of cancer; however, without doubt, in vivo animal studies or human clinical trials are more convincing in this area. Until a more precise conclusion can be drawn, we would recommend that a healthy dietary intake should include anthocyanin-rich sources as well as a varied diet of fruit and vegetables rich in other bioactive compounds. For future perspectives, further studies would be necessary in order to clarify the possible mechanisms and to evaluate the bioavailability of anthocyanins before they can be used extensively in clinical applications to reduce tumor and cancer risk.
Funding
The authors acknowledge support from the Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI, project number PN-III-P1-1.2-PCCDI-2017-0056 within PNCDI III.
Conflicts of Interest
No potential conflict of interest was reported by the authors.
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Figure 2.
Food rich in the source of anthocyanins.
Figure 3.
Anthocyanins’ sources and their chemical patterns.
Figure 4.
The illustrations of the types of skin cancer, namely: (a) Squamous cell carcinoma; (b) Basal cell cancer and (c) Melanoma.
Figure 4.
The illustrations of the types of skin cancer, namely: (a) Squamous cell carcinoma; (b) Basal cell cancer and (c) Melanoma.
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Diaconeasa, Z.; Știrbu, I.; Xiao, J.; Leopold, N.; Ayvaz, Z.; Danciu, C.; Ayvaz, H.; Stǎnilǎ, A.; Nistor, M.; Socaciu, C. Anthocyanins, Vibrant Color Pigments, and Their Role in Skin Cancer Prevention. Biomedicines 2020, 8, 336. https://doi.org/10.3390/biomedicines8090336
AMA Style
Diaconeasa Z, Știrbu I, Xiao J, Leopold N, Ayvaz Z, Danciu C, Ayvaz H, Stǎnilǎ A, Nistor M, Socaciu C. Anthocyanins, Vibrant Color Pigments, and Their Role in Skin Cancer Prevention. Biomedicines. 2020; 8(9):336. https://doi.org/10.3390/biomedicines8090336
Chicago/Turabian StyleDiaconeasa, Zorița, Ioana Știrbu, Jianbo Xiao, Nicolae Leopold, Zayde Ayvaz, Corina Danciu, Huseyin Ayvaz, Andreea Stǎnilǎ, Mǎdǎlina Nistor, and Carmen Socaciu. 2020. "Anthocyanins, Vibrant Color Pigments, and Their Role in Skin Cancer Prevention" Biomedicines 8, no. 9: 336. https://doi.org/10.3390/biomedicines8090336
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