Antioxidants and Bioactive Compounds in Fermented Foods Volume 2

A special issue of Antioxidants (ISSN 2076-3921). This special issue belongs to the section "Natural and Synthetic Antioxidants".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 11213

Special Issue Editors


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Guest Editor
Department of Food and Biotechnology, Korea University, Sejong 30019, Republic of Korea
Interests: fermented foods; fermentation; food safety; foodborne pathogenic bacteria; spore-forming bacteria; biogenic amines; ethyl carbamate; starter culture; antimicrobial compounds
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Guest Editor
Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju, Korea
Interests: reactive oxygen species (ROS); biomarkers in cancer stem cell; antioxidants from natural products and bioconversion; cytochrome P450

Special Issue Information

Dear Colleagues,

We are delighted to announce the Special Issue Antioxidants and Bioactive Compounds in Fermented Foods Volume 2. Volume 1 can be found here:

https://www.mdpi.com/journal/antioxidants/special_issues/Antioxidants_Fermented_Foods

Fermentation is one of the oldest techniques used in food processing and preservation. A variety of fermented foods have been developed, produced, and consumed worldwide for thousands of years to provide nutrients for human needs without being affected by seasonal availability or the environment. Fermented foods commonly consumed in Western countries include cheese, yogurt, fermented sausage, sauerkraut, bread, beer, and wine, whereas kimchi, pickles, fermented fish sauces, fermented soybean foods, and traditional alcoholic beverages are representative fermented foods eaten in Eastern countries. Over the past few decades, it has been proven that a variety of fermented foods and their bioactive compounds have health-promoting effects such as anti-obesity, anti-diabetic, anti-dyslipidemic, anti-atherogenic, anti-inflammatory effects, etc. Consequently, fermented foods are gaining popularity around the world, and the production, consumption, export, and import of fermented foods continue to increase year after year.

In fermented foods, carbohydrates, proteins, lipids, and aromatic polymers present in natural materials are bioconverted to bioactive compounds of particular interest, such as phenolic compounds, γ-aminobutyric acid, γ-polyglutamic acid, conjugated linoleic acid, etc., throughout the fermentation process. It has also been reported that, while different bioactive compounds may share the same physiological functionality, a single bioactive compound may have multiple activities. Moreover, bioconversion using microbial enzymes has been applied to enhance the activity of bioactive compounds by increasing production and/or changing structural conformation. Research has shown that bioactive compounds produced through fermentation or bioconversion have functional properties, such as antioxidative activity, tyrosinase inhibitory activity, elastase inhibitory activity, and α-glucosidase inhibitory activity, and have an effect in the prevention and treatment of several diseases such as obesity, diabetes, dyslipidemia, atherosclerosis, hypertension, inflammation, neurodegeneration, and hyperpigmentation. Due to such health-promoting functions, a variety of fermented foods have become of interest as potential sources of bioactive compounds. Thus, intensive research has been conducted to increase the production of bioactive compounds that are bioconverted or newly acquired and enhance the activity of these compounds via the fermentation and bioconversion of natural materials. Such research includes: identification of novel antioxidants and bioactive compounds in a variety of fermented foods and their physiological activities; optimization of fermentation and bioconversion conditions to maximize the production and physiological activities of antioxidants and bioactive compounds; validation of practical effects of antioxidants and bioactive compounds via in vivo and clinical tests; and application of antioxidants and bioactive compounds to various industries such as medicine, cosmetics, and food industries, along with other related studies. This Special Issue will focus on new information from research on the subject above. Please submit your latest research results or review articles on antioxidants and bioactive compounds in fermented foods to be published in this Special Issue.

Dr. Jae-Hyung Mah
Prof. Dr. Dong-Sun Lee
Guest Editors

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Published Papers (3 papers)

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Research

15 pages, 3608 KiB  
Article
Antioxidant Capacities and Polyphenol Contents of Kombucha Beverages Based on Vine Tea and Sweet Tea
by Adila Saimaiti, Si-Yu Huang, Ruo-Gu Xiong, Si-Xia Wu, Dan-Dan Zhou, Zhi-Jun Yang, Min Luo, Ren-You Gan and Hua-Bin Li
Antioxidants 2022, 11(9), 1655; https://doi.org/10.3390/antiox11091655 - 25 Aug 2022
Cited by 23 | Viewed by 4058
Abstract
Kombucha beverage is commonly prepared by black tea infusion fermentation without tea residues, and possesses various health benefits. In this paper, kombucha beverages of two non-Camellia sinensis teas, including vine tea (Ampelopsisgrossedentata) and sweet tea (Rubus suavissimus), [...] Read more.
Kombucha beverage is commonly prepared by black tea infusion fermentation without tea residues, and possesses various health benefits. In this paper, kombucha beverages of two non-Camellia sinensis teas, including vine tea (Ampelopsisgrossedentata) and sweet tea (Rubus suavissimus), were studied for the first time. The antioxidant activities and polyphenol contents of kombucha beverages were evaluated by ferric-reducing antioxidant power assay, Trolox equivalent antioxidant capacity assay, and Folin-Ciocalteu method, respectively. In addition, effects of tea residues on antioxidant capacities of kombucha beverages were evaluated. The results showed that kombucha beverages from vine tea and sweet tea possessed strong antioxidant activities (especially vine tea kombucha), and fermentation with tea residues could significantly increase antioxidant capacities (maximum increase of 38%) and total phenolic content (maximum increase of 55%) of two kombucha beverages compared with those without tea residues. Moreover, the sensory evaluations showed that the sensory evaluation scores of kombucha with tea residues could be improved compared with those without tea residues. Furthermore, the concentrations of several bioactive components in the kombucha beverages were detected by high-performance liquid chromatography. These kombucha beverages could be used for prevention of several diseases with related of oxidative stress. Full article
(This article belongs to the Special Issue Antioxidants and Bioactive Compounds in Fermented Foods Volume 2)
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18 pages, 2170 KiB  
Article
Evaluation of Bioactive Compounds and Antioxidative Activity of Fermented Green Tea Produced via One- and Two-Step Fermentation
by Huiling Xu, Jong Hyoung Hong, Dabin Kim, Young Hun Jin, Alixander Mattay Pawluk and Jae-Hyung Mah
Antioxidants 2022, 11(8), 1425; https://doi.org/10.3390/antiox11081425 - 22 Jul 2022
Cited by 7 | Viewed by 2742
Abstract
This study investigated the influence of one- and two-step fermentation on bioactive compound production in fermented green tea, i.e., one-step fermented green tea (OFG) and two-step fermented green tea (TFG). One-step fermentation entailed acetic acid fermentation, while two-step fermentation consisted of lactic acid [...] Read more.
This study investigated the influence of one- and two-step fermentation on bioactive compound production in fermented green tea, i.e., one-step fermented green tea (OFG) and two-step fermented green tea (TFG). One-step fermentation entailed acetic acid fermentation, while two-step fermentation consisted of lactic acid fermentation followed by acetic acid fermentation. Acetobacter pasteurianus PCH 325, isolated from an over-ripened peach, was selected for acetic acid fermentation based on its growth and organic acid production characteristics. Acetic acid fermentation conditions were optimized for one- and two-step fermentation: 3% fermentation alcohol for both processes; 8% and 4% sucrose, respectively; and fermentation at 25 °C for both processes. For lactic acid fermentation of TFG, the inoculum and optimized conditions reported previously were used. Under the optimized conditions, the acetic acid content in OFG and TFG increased 21.20- and 29.51-fold, respectively. Furthermore, through two-step fermentation, γ-aminobutyric acid and lactic acid were produced up to 31.49 ± 1.17 mg/L and 243.44 ± 58.15 mg/L, respectively, which together with acetic acid could contribute to the higher DPPH scavenging activity of TFG. This study suggests that two-step fermentation may be a valuable strategy in industry for raising the amount of acetic acid and/or providing additional bioactive compounds. Full article
(This article belongs to the Special Issue Antioxidants and Bioactive Compounds in Fermented Foods Volume 2)
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16 pages, 822 KiB  
Article
The Impact of Fermentation on Bee Pollen Polyphenolic Compounds Composition
by Vaida Adaškevičiūtė, Vilma Kaškonienė, Karolina Barčauskaitė, Paulius Kaškonas and Audrius Maruška
Antioxidants 2022, 11(4), 645; https://doi.org/10.3390/antiox11040645 - 28 Mar 2022
Cited by 23 | Viewed by 3334
Abstract
Bee-collected pollen is one of the most valuable natural products. However, the pollen cell walls limit the digestibility and release of nutrients to the human body. Solid-state lactic acid fermentation can be used to ease the release of bioactive compounds from the pollen [...] Read more.
Bee-collected pollen is one of the most valuable natural products. However, the pollen cell walls limit the digestibility and release of nutrients to the human body. Solid-state lactic acid fermentation can be used to ease the release of bioactive compounds from the pollen cell. The aim of this research was to determine the impact of a solid-state lactic acid fermentation process on biologically active compound composition and antioxidant activity of bee-collected pollen from various European regions (Italy, Netherlands, Lithuania, Poland, Sweden, Denmark, Malta, Slovakia, and Spain). Spontaneous fermentation and fermentation using an L. rhamnosus culture were performed. The total content of phenolic compounds, total content of flavonoids, and radical (DPPH) scavenging activity were measured by spectrophotometric tests, while UPLC was employed for quantification of phenolic compounds. The determined fermentation positive effects included an increase of total phenolic content by 1.4–2.3 times, total flavonoid content by 1.1–1.6 times, and radical scavenging activity by 1.4–2.3 times. Naringenin (21.09–135.03 µg/g), quercetin (6.62–78.86 µg/g), luteolin (29.41–88.90 µg/g), and rutin (21.40–89.93 µg/g) were the most abundant flavonoids in all samples; however, their variation level was both geographical in origin and fermentation-type dependent. Fermentation increased the content of phenolic acids with high antioxidant potentials such as ellagic, ferulic and caffeic, while reduction of chlorogenic acid was determined. Full article
(This article belongs to the Special Issue Antioxidants and Bioactive Compounds in Fermented Foods Volume 2)
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