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Special Issue "Resource Extraction from Agricultural Products/Waste"

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A special issue of Resources (ISSN 2079-9276).

Deadline for manuscript submissions: 31 January 2024 | Viewed by 6478

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Special Issue Editors

Dr. Athanasios Angelis Dimakis

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Guest Editor

Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, UK
Interests: industrial ecology; waste management; circular economy; life cycle assessment
Special Issues, Collections and Topics in MDPI journals

Dr. Maria Dimopoulou

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Guest Editor

School of Health and Life Sciences, Teesside University, Middlesbrough, UK
Interests: food sustainability; agricultural waste extraction; polysaccharide extraction; physicochemical characterisation; functional applications

Dr. Antonia Vyrkou

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Guest Editor

Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, UK
Interests: life cycle assessment; waste management; valorization of agricultural waste

Special Issue Information

Dear Colleagues,

The extraction process is the starting point for the isolation and purification of chemical constituents present in agricultural resources, especially in agricultural byproducts. This Special Issue focuses not only on the conventional extraction methods, but also on the latest and most innovative approaches for extracting bioactive compounds from foods and agricultural by-products. Manuscripts that focus on functional applications, scale-up and process commercialisation using extraction techniques are also welcome.

Dr. Athanasios Angelis Dimakis
Dr. Maria Dimopoulou
Dr. Antonia Vyrkou
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. Resources 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 1600 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

extraction techniques: conventional, green impacts and sustainable
separation and purification methodologies
agricultural resources/wastes
industrial applications

Published Papers (5 papers)

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Research

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Open AccessArticle

Comparative Study of the Yield and Chemical Profile of Rose Oils and Hydrosols Obtained by Industrial Plantations of Oil-Bearing Roses in Bulgaria

Ana Dobreva

Deyana Nedeva

and

Milka Mileva

Resources 2023, 12(7), 83; https://doi.org/10.3390/resources12070083 - 10 Jul 2023

Viewed by 813

Abstract

Bulgaria is famous for its oil-bearing rose. R. damascena Mill. and R. alba L. are mainly cultivated in the country, but a recent survey of industrial plantations in 2020 revealed that R. centifolia L. and hybrids of R. damascena Mill. X R. gallica L. are also common in the rose valley. Although their essential oil cannot be compared in quality with the classic, these species are preferred by farmers with high yields of flowers and resistance to diseases and pests. All these roses are also used to produce rose water and extracts. The aim of this investigation was to compare the yield and chromatographic fingerprints of seven rose oils and hydrosols produced in Bulgaria. The quantitative composition of the main components of the oils was compared with the norms of the world standards. Our study showed that the yield of essential oil from these roses was in the range of 0.015–0.048%. The main group in the chemical composition is terpene alcohols, which vary in range: geraniol (15.85–34.02%), citronellol (6.70–28.72%), and nerol (5.80–11.90%) but with a different ratio. Hydrocarbons are represented by saturated aliphatic homologs with an odd number of carbon atoms, the main ones being nonadecane (8.10–22.67%), heneicosane (4.37–10.21%), heptadecane (1.07–2.98%), and triclosan (0.81–5.90%). In contrast, the chemical profile of the hydrosols was performed using phenylethyl alcohol (27.45–69.88%), geraniol (13.72–28.67%), and citronelol+nerol (4.56–17.37%). The results show that the presence of plantations with a genotype different from that of R. damascena implies differences in the quality of rose oils and hydrosols. This determines their properties of use. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste)

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Open AccessFeature PaperArticle

The Recovery of Bioactive Compounds from Olive Pomace Using Green Extraction Processes

Marina Stramarkou

Theodora-Venetia Missirli

Konstantina Kyriakopoulou

Sofia Papadaki

Athanasios Angelis-Dimakis

and

Magdalini Krokida

Resources 2023, 12(7), 77; https://doi.org/10.3390/resources12070077 - 29 Jun 2023

Cited by 1 | Viewed by 692

Abstract

In this study, solid olive mill waste (SOMW) was used to obtain antioxidant compounds using solid–liquid extraction. The effect of different extraction methods, namely microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), Soxhlet, and conventional solvent extraction, on the yield, total phenolics, and total antioxidant activity of SOMW extracts was investigated. Untreated and dried SOMW were subjected to extraction with water and methanol. The antioxidant activity of the extracts was evaluated using the DPPH assay, while their total phenolic content was measured using the Folin–Ciocalteu method. For the characterisation of the extracts, HPLC-DAD analysis was performed. The results showed that the extraction yield was significantly influenced (p < 0.05) by the solvent used, the material treatment prior to extraction, the moisture content of SOMW samples, and the extraction time. The optimised parameters were water, as the extraction solvent, and MAE as the extraction technique (extraction temperature of 50 °C and time of 1 h). The evaluation of the antioxidant activity of the extracts indicated that phenolics were the dominant bioactive compounds. The extracts were found to be rich in several hydroxytyrosol derivatives. Therefore, SOMW can be a valuable resource for bioactive compounds using conventional and innovative extraction techniques. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste)

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Open AccessArticle

Sustainable Valorisation of Peach and Apricot Waste Using Green Extraction Technique with Conventional and Deep Eutectic Solvents

Marina Stramarkou

Vasiliki Oikonomopoulou

Margarita Panagiotopoulou

Sofia Papadaki

and

Magdalini Krokida

Resources 2023, 12(6), 72; https://doi.org/10.3390/resources12060072 - 12 Jun 2023

Viewed by 927

Abstract

Worldwide, fruit processing industries reject high volumes of fruit waste, which represent rich sources of phenolic compounds and can be valorised through extraction, and then be reused for food, nutraceutical or cosmetic applications. In the present work, the optimisation of the recovery of phenolic compounds from apricot kernels and pulp, as well as peach pulp, through the green method of ultrasound and microwave assisted extraction (UMAE) is performed. Prior to extraction, a drying step of the pulps is conducted using freeze, vacuum and hot air drying. Except for the conventional extraction solvents of water and ethanol:water, a deep eutectic solvent (DES) formed by choline chloride/urea, and a natural deep eutectic solvent (NaDES) from choline chloride with lactic acid, are used, something that presentsecological benefits. With the aim of discovering the optimum extraction conditions, different values of the parameters of extraction time, utrasonic power and solvent/dry solid ratio are examined, and a mathematical model is developed to correlate them to the extraction yield (EY). The phenolic compounds and the antioxidant activity are determined through UV-Vis spectroscopy and High-Performance Liquid Chromatography (HPLC). The results of the study demonstrated that the most effective solvent in the extraction of apricot kernels is ethanol: water; DES is more efficient in the extraction of apricot pulp and NaDES in the extraction of peach pulps, reaching EYs of 25.65, 26.83 and 17.13%, respectively. In conclusion, both types of fruit waste are proved to have a significant content of valuable compounds, and the use of DES in fruit by-product extraction is effective and seems to be a promising alternative. Thus, the unexploited amounts of waste can be valorised through simple techniques and innovative solvents. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste)

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Open AccessArticle

Olive Mill Pomace Extract Loaded Ethylcellulose Microparticles as a Delivery System to Improve Olive Oils Oxidative Stability

Filipa Paulo

Loleny Tavares

and

Lúcia Santos

Resources 2023, 12(1), 6; https://doi.org/10.3390/resources12010006 - 03 Jan 2023

Cited by 1 | Viewed by 1149

Abstract

The protective effect of olive mill pomace (OMP) loaded ethylcellulose microparticles as an alternative to synthetic antioxidants against the oxidation of olive oils was assessed. OMP extract was obtained by an optimized two-step solid-liquid extraction; encapsulation was performed by double emulsion solvent evaporation technique considering a theoretical loading content in phenolic compounds of 5% (w/w). The changes in the peroxide values, the p-anisidine values, the total oxidation values, the free fatty acids content, the total antioxidant activity, and the total phenolic content were synchronized under storage at 62 °C. The results of oxidative stability were compared with plain oils, oils enriched with synthetic antioxidants, and oils fortified with OMP extract. The encapsulation efficiency of phenolic compounds was 96.0 ± 0.3%. The fortification of olive oils with microparticles retarded the appearance of peroxides, reduced the content of secondary oxidation products, and slowed down hydrolysis processes. The microparticles were efficiently designed to sustain the release of antioxidants to control the oxidative status of oil samples, retarding the free fatty acids formation rather than synthetic antioxidants. The results of this study bring new perspectives regarding the potential use of encapsulated extracts rich in antioxidants as an alternative to synthetic antioxidants to improve oil oxidative stability. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste)

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Review

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Open AccessReview

Solid-State Fermentation for the Recovery of Phenolic Compounds from Agro-Wastes

Nadia D. Cerda-Cejudo

José J. Buenrostro-Figueroa

Leonardo Sepúlveda-Torre

Cristian Torres-León

Mónica L. Chávez-González

Juan A. Ascacio-Valdés

and

Cristóbal N. Aguilar

Resources 2023, 12(3), 36; https://doi.org/10.3390/resources12030036 - 06 Mar 2023

Cited by 2 | Viewed by 2189

Abstract

Polyphenolic compounds are a group of secondary metabolites in plants; these molecules are widely distributed in fruits, vegetables, and herbs and can be found in the vacuoles of plant cells. The current trend in these compounds is their extraction to study their applications in several areas, such as the food, cosmetic, and pharmacology industry. This review article presents a critical analysis of polyphenol extraction using solid-state fermentation. The parameters of extraction, such as the substrate, temperature, pH, inoculum of the microorganism, moisture, and water activity, are discussed in detail. This biotechnological extraction method affects the concentration and recovery of polyphenolic compounds. Some polyphenolic sources that are rising for their biological properties belong to agro-industrial wastes, such as peels, seeds, and the pulp of some fruits. Solid-state fermentation is an innovative and environmentally friendly tool that can contribute to generating value-added agrifood from agro-industrial wastes. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste)

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