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Antioxidants
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Intensification Technologies to Efficiently Extract Antioxidants from Agro-Food and Marine...
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Intensification Technologies to Efficiently Extract Antioxidants from Agro-Food and Marine Residues

A special issue of Antioxidants (ISSN 2076-3921). This special issue belongs to the section "Extraction and Industrial Applications of Antioxidants".

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 7847

Special Issue Editors

Dr. Soraya Rodriguez-Rojo

E-Mail Website
Guest Editor
High pressure process group, Bioeconomy Institute of University of Valladolid, Valladolid, Spain
Interests: natural products; polyphenols; essential oils; extraction; formulation; pressurized fluids; microwaves; ultrasounds
Special Issues, Collections and Topics in MDPI journals
Dr. Naiara Fernández

E-Mail Website
Guest Editor
Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal
Interests: waste valorization; deep eutectic solvents; pressurized co2 extraction; microwave-assisted extraction; natural bioactives

Special Issue Information

Dear Colleagues,

Last year, the Special Issue launched to gather research in the efficient recovery of bioactive compounds from vegetal matrices with nonconventional technologies (https://www.mdpi.com/journal/antioxidants/special_issues/Extract_Antioxidant_AgroFood_Residues) has had a notable impact, with 17 articles published.
In this second volume, we wish to widen the topic to marine residues as an important source of bioactive compounds, especially considering that more than 70% of the Earth is covered by water and the blue economy paradigm for sustainable development. Moreover, marine origin biomasses, such as microalgae, fish or seafood, are gaining attention lately, due to their high content on health-related bioactives.

These natural compounds can be employed widely in food and feed, nutraceuticals, cosmetics and pharma products, among others, thanks to their bioactive properties, such as antioxidant, antimicrobial, etc. 
The recovery of the bioactives usually involves several steps, where an adequate pretreatment and extraction method are of foremost importance. Conventional solid–liquid extraction is often the technique of choice at the industrial scale. Its main drawbacks are the high solvent consumption and long extraction times that may degrade thermolabile compounds, due to the relatively high temperature required to improve the mass transfer.
Therefore, the sustainable recovery of natural compounds from agro-food wastes and marine residues would benefit from the implementation of intensified processes covering the use of solvents with improved properties (pressurized and supercritical fluids, deep eutectic solvents or hydrotropes), nonconventional-energy-assisted techniques (microwave, ultrasound and pulsed electric) or high static pressure. All these technologies, which are being studied at laboratory and pilot scales, aim to develop highly efficient methods for the extraction of natural bioactive compounds according to the “Green Engineering principles ”.

As guest editors, we cordially invite you to contribute to this new Special Issue by submitting original research articles and review papers according to your notable expertise in the valorisation of by-products and wastes to efficiently extract bioactive compounds with antioxidant activities, along with other bioactive properties. 

Dr. Soraya Rodriguez-Rojo
Dr. Naiara Fernández
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Antioxidants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • agro-food residues
  • forest management residues
  • marine residues
  • bioactive compounds
  • natural antioxidant compounds
  • intensified extraction
  • green engineering
  • pressurized and supercritical fluids
  • (natural) deep eutectic solvents
  • hydrotropes
  • microwaves
  • ultrasounds
  • electrical pulsed energy

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Related Special Issue

Published Papers (3 papers)

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Research

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20 pages, 1355 KiB  
Article
Metabolite Profiling of Microwave-Assisted Sargassum fusiforme Extracts with Improved Antioxidant Activity Using Hybrid Response Surface Methodology and Artificial Neural Networking-Genetic Algorithm
by Ahsan Javed, Marufa Naznin, Md. Badrul Alam, Alshammari Fanar, Bo-Rim Song, Sunghwan Kim and Sang-Han Lee
Antioxidants 2022, 11(11), 2246; https://doi.org/10.3390/antiox11112246 - 14 Nov 2022
Cited by 11 | Viewed by 2167
Abstract
Sargassum fusiforme (SF) is a popular edible brown macroalga found in Korea, Japan, and China and is known for its health-promoting properties. In this study, we used two sophisticated models to obtain optimized conditions for high antioxidant activity and metabolite profiling using high-resolution [...] Read more.
Sargassum fusiforme (SF) is a popular edible brown macroalga found in Korea, Japan, and China and is known for its health-promoting properties. In this study, we used two sophisticated models to obtain optimized conditions for high antioxidant activity and metabolite profiling using high-resolution mass spectrometry. A four-factor central composite design was used to optimize the microwave-assisted extraction and achieve the maximum antioxidant activities of DPPH (Y1: 28.01 % inhibition), ABTS (Y2: 36.07 % inhibition), TPC (Y3: 43.65 mg GAE/g), and TFC (Y4: 17.67 mg CAE/g), which were achieved under the optimized extraction conditions of X1: 47.67 %, X2: 2.96 min, X3: 139.54 °C, and X4: 600.00 W. Moreover, over 79 secondary metabolites were tentatively identified, of which 12 compounds were reported for the first time in SF, including five phenolic (isopropyl 3-(3,4-dihydroxyphenyl)-2-hydroxypropanoate, 3,4-dihydroxyphenylglycol, scopoletin, caffeic acid 4-sulfate, and cinnamoyl glucose), two flavonoids (4’,7-dihydroxyisoflavone and naringenin), three phlorotannins (diphlorethohydroxycarmalol, dibenzodioxin-1,3,6,8-tetraol, and fucophlorethol), and two other compounds (dihydroxyphenylalanine and 5-hydroxybenzofuran-2(3H)-one) being identified for the first time in optimized SF extract. These compounds may also be involved in improving the antioxidant potential of the extract. Therefore, optimized models can provide better estimates and predictive capabilities that would assist in finding new bioactive compounds with improved biological activities that can be further applied at a commercial level. Full article
(This article belongs to the Special Issue Intensification Technologies to Efficiently Extract Antioxidants from Agro-Food and Marine Residues)
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19 pages, 10386 KiB  
Article
Ultrasound-Assisted Alcoholic Extraction of Lesser Mealworm Larvae Oil: Process Optimization, Physicochemical Characteristics, and Energy Consumption
by Seyed Mohammad Taghi Gharibzahedi and Zeynep Altintas
Antioxidants 2022, 11(10), 1943; https://doi.org/10.3390/antiox11101943 - 28 Sep 2022
Cited by 12 | Viewed by 2585
Abstract
The ultrasound-assisted extraction (UAE) of oil from lesser mealworm (Alphitobius diaperinus L.) larvae powders (LMLPs) using ethanol/isopropanol as the superior solvent was optimized. The evaluation of time (9.89–35.11 min), solvent-to-LMLPs (2.39–27.61 v/w), and temperature (16.36–83.64 °C) showed that the [...] Read more.
The ultrasound-assisted extraction (UAE) of oil from lesser mealworm (Alphitobius diaperinus L.) larvae powders (LMLPs) using ethanol/isopropanol as the superior solvent was optimized. The evaluation of time (9.89–35.11 min), solvent-to-LMLPs (2.39–27.61 v/w), and temperature (16.36–83.64 °C) showed that the highest extraction efficiency (EE, 88.08%) and in vitro antioxidant activity (IVAA) of reducing power (0.651), and DPPH free-radical scavenging capacity (70.79%) were achieved at 22.5 v/w solvent-to-LMLPs and 70 °C for 22.64 min. Optimal ultrasound conditions significantly improved the EE than n-hexane extraction (60.09%) by reducing the electric energy consumption by ~18.5 times from 0.637 to 0.035 kWh/g. The oil diffusivity in ethanol-isopropanol during the UAE (0.97 × 10−9 m2/s) was much better than that of n-hexane (5.07 × 10−11 m2/s). The microstructural images confirmed the high efficiency of ethanol-isopropanol in the presence of ultrasounds to remove oil flakes from the internal and external surfaces of LMLPs. The improved IVAA was significantly associated with the total phenolic (4.306 mg GAE/g, r = 0.991) and carotenoid (0.778 mg/g, r = 0.937) contents (p < 0.01). Although there was no significant difference in the fatty acid profile between the two extracted oils, ethanol-isopropanol under sonication acceptably improved oxidative stability with lower peroxides, conjugated dienes and trienes, and free fatty acids. Full article
(This article belongs to the Special Issue Intensification Technologies to Efficiently Extract Antioxidants from Agro-Food and Marine Residues)
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Review

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21 pages, 2694 KiB  
Review
Advances in Production of Hydroxycinnamoyl-Quinic Acids: From Natural Sources to Biotechnology
by Egle Valanciene and Naglis Malys
Antioxidants 2022, 11(12), 2427; https://doi.org/10.3390/antiox11122427 - 9 Dec 2022
Cited by 9 | Viewed by 2481
Abstract
Hydroxycinnamoyl-quinic acids (HCQAs) are polyphenol esters formed of hydroxycinnamic acids and (-)-quinic acid. They are naturally synthesized by plants and some micro-organisms. The ester of caffeic acid and quinic acid, the chlorogenic acid, is an intermediate of lignin biosynthesis. HCQAs are biologically active [...] Read more.
Hydroxycinnamoyl-quinic acids (HCQAs) are polyphenol esters formed of hydroxycinnamic acids and (-)-quinic acid. They are naturally synthesized by plants and some micro-organisms. The ester of caffeic acid and quinic acid, the chlorogenic acid, is an intermediate of lignin biosynthesis. HCQAs are biologically active dietary compounds exhibiting several important therapeutic properties, including antioxidant, antimicrobial, anti-inflammatory, neuroprotective, and other activities. They can also be used in the synthesis of nanoparticles or drugs. However, extraction of these compounds from biomass is a complex process and their synthesis requires costly precursors, limiting the industrial production and availability of a wider variety of HCQAs. The recently emerged production through the bioconversion is still in an early stage of development. In this paper, we discuss existing and potential future strategies for production of HCQAs. Full article
(This article belongs to the Special Issue Intensification Technologies to Efficiently Extract Antioxidants from Agro-Food and Marine Residues)
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