Microwave-Assisted Extraction of Different Groups of Phenolic Compounds from Grape Skin Pomaces: Modeling and Optimization

Abstract

This means that grape pomace still exhibits high levels of bioactive compounds (60-70%) with strong antioxidant, antibacterial, and cytotoxic activities as well as favorable pharmacological properties [Bartolomé et al., 2004; Peixoto et al., 2018]. These compounds are known to contribute to human health and are particularly associated with reduced incidence of cardiovascular diseases as atherosclerosis and hypertension, neurodegeneration, and similar medical conditions [Auger et al., 2004; De Sales et al., 2018; Rodriguez-Rodriguez et al., 2012]. Grape skins pomace proved to be a good source of anthocyanins, hydroxycinnamic acids, fl avanols and fl avonols, whereas fl avanols are the most abundant seed polyphenols [Kammerer et al., 2004; Ky et al., 2014]. As a result of the increased concern over the sustainability of agricultural practices, efforts have been made to enable the use of grape pomaces bioactive extracts in various segments of food, pharmaceutical and cosmetic industry, resulting in applications such as natural antioxidant, source of natural pigments, additive in wine production, functional ingredient, etc. [Beres et al., 2017; Ky & Teissedre, 2015]. Thus, it is necessary to have effi cient extraction methods to achieve high recoveries of phenolic compounds that allow quality control of obtained extracts through their analysis and characterization. Microwave-assisted extraction (MAE) has been investigated and proposed as better than conventional extraction

Evaluation of Extracts Obtained from FruitWastes Using Different Methods

“…When comparing the results obtained with data reported in the literature for GP extracts, it is observed that ORAC values found in the pre-sent study are up to 12 times higher. In the case of MAE using methanol 60 % as a solvent, an ORAC value of 31.982,06 µg TRO-LOX/g [33] was reported, whereas for SOL, a value of 68.204,03 µg TROLOX/g was found [25]. This indicates that the operating conditions used in the extraction significantly affect the antioxidant capacity of the extracts.…”

Extraction of Phenolic Compounds From Fenugreek Seeds: Modelling and Analysis Using Artificial Neural Networks

“…In literature, ANN based modelling has been recently applied for simulation and optimization for the extractions of phenolic compounds from garlic [18], green and black tea [19], cocoa shell [20], sweet potato peel [21], peppermint [22], grape skin pomaces [23], and to predict the particle size of phenolic compounds in nano-systems [24]. However, there have been no studies modeling and analyzing the extraction of phenolic compounds from fenugreek seeds by ANN.…”

Chemometric Optimization of Biologically Active Compounds Extraction from Grape Marc: Composition and Antimicrobial Activity

“…New unconventional techniques have emerged that can reduce extraction time, process temperature and solvent consumption, thus contributing to higher extraction efficiency and lower energy consumption. Some of the most relevant technologies are: ultrasonic-assisted extraction (UAE) [ 6 , 34 ], microwave-assisted extraction (MAE) [ 35 , 36 ], supercritical fluid extraction (SFE) [ 37 ], liquid pressure extraction (PLE) [ 38 ], ohmic heating (OH) [ 39 ], pulsed electric fields (PEF) [ 40 , 41 ] and enzyme-assisted extraction (EAE) [ 42 ]. Some enzymes, such as cellulases, hemicellulases, pectinases or amylases, can break down or weaken cell walls, releasing cytoplasmic contents (e.g., phenolic compounds) into the extraction solvent and thus improving extraction recovery.…”