engleski

Green solvents for green technologies

Objectives Over the past decade, among neoteric solvents, natural deep eutectic solvents (NADES) have become promising alternatives to traditional organic solvents from both environmental and technological perspectives and have been dramatically increasing in popularity. Herein, a brief overview of the up to date knowledge regarding these solvents, with special emphasis on to possible application in extraction of phenolic compounds from grape pomace are presented. Methods Application of NADES in polyphenols compounds’ extraction from grape pomace was studied. The valorisation of obtained extracts was also performed by complete analysis of phenolic compounds. Recovery of polyphenols and recycling of the NADES were also accomplished. Green extraction method for polyphenols from grape pomace was performed on a bigger scale. Results An environmentally friendly extraction method for polyphenols from grape pomace with NADES coupled with alternative energy sources – ultrasound and microwave irradiation used simultaneously were developed on a bigger scale. Screening of 10 different NADES was performed and choline chloride-based NADES containing citric acid as a hydrogen bond donor was selected as the most promising one. Then, optimization of the process parameters of the extraction was carried out considering the anthocyanins extraction yield. Recovery of anthocyanins and efficient recyclation of NADES were accomplished on resin Amberlite XAD-7HP.

Green solvents, polyphenols compounds, grape pomace

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