Mathematical optimization of the green extraction of polyphenols from grape peels through a cyclic pressurization process

Abstract

In the current era of high consumption and increasing waste, many products that are believed to be unusable can find a new purpose in the market. For example, the grape peel waste resulting from the production of wine contains numerous bioactive compounds. In reality, grape peels are by-products of winemaking that can be conveniently reused in many different ways, including agronomic use and cosmetic industry applications. Moreover, the by-products can also be used in the energy field as biomass for the production of biogas or in food plants for the production of energy. In this article, to extract polyphenols, grape peels were processed via a cyclically pressurized extraction method known as rapid solid-liquid dynamic extraction (RSLDE), which does not require the use of any organic solvent or include heating or cooling processes that can cause the loss of substances of interest. To better understand the cyclically pressurized extraction process, a numerical simulation was performed to evaluate the exchange between the grape piece solid matrix and water during the extraction process. Furthermore, a finite element model was used to numerically determine the time-dependent concentration distribution at specific times.

Study of the Kinetics of Extraction Process for The Production of Hemp Inflorescences Extracts by Means of Conventional Maceration (CM) and Rapid Solid-Liquid Dynamic Extraction (RSLDE)

“…In the literature, several applications of CPE process have been reported in which it is possible to find that the CPE process was much more efficient, as it allowed to drastically reduce the extraction times. The saturation value and time were also confirmed by the experimental data: in a shorter time, the extractable material was still present in the matrix, while after 4 h the matrix was completely exhausted [14][15][16][17][18][19].…”

“…To better understand the extraction phenomenon under investigation, analytical and numerical approaches available in the current literature were considered [14][15][16][17][18][19].…”

Bioactive Phenolic Compounds From Agri-Food Wastes: An Update on Green and Sustainable Extraction Methodologies

“…The solid liquid dynamic Naviglio extraction of vine shoot waste from Vitis vinifera Airen variety performed in different conditions provided higher flavonoid and phenolic acid yields in comparison with others solid-liquid extraction methods (222). The vine shoot waste aqueous extract, in particular, stimulated Lactuca sativa radicule elongation (223). Naviglio extraction has also been reported for the recovery of polyphenols from grape peels (224).…”

Techniques and modeling of polyphenol extraction from food: a review

“…The technique uses liquid pressure and takes place at room temperature (or slightly lower) in order to avoid thermal stress on phenolic compounds. The technique is environmentally friendly and requires less energy as compared to conventional extraction process Wine Gallo et al ( 2019 ) Vacuum-based solvent-free microwave extraction Green extraction method which does not require solvent usage. The food matrix is exposed to microwave radiation leading to expansion of cells resulting in extraction of solutes.…”