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Green extraction of phenolic compounds from grape pomace by deep eutectic solvent extraction: physicochemical properties, antioxidant capacity

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Abstract

Herein, new function-oriented deep eutectic solvents (DESs) with on l-proline or betaine and DL-lactic acid were designed extraction of polyphenol compounds from grape pomace. The formations of new hydrogen between the two components of DESs were evidenced by FTIR and 1H NMR spectra. Physicochemical characteristics of deep eutectic solvents under the effect of water on density, viscosity, electrical resistance have been revealed. The betaine-based DES could changes the electrical resistance depending on the concentration of water. The feasibility of using ultrasound-assisted extraction of phytochemicals combined with betaine-based and proline-based DES as a green chemistry technique to improve extraction of green (polyphenols) compounds from grape pomace was evaluated. Grape pomace extracts were analyzed by LC-DAD-MS to identify extracted compounds and analyze the impact of type DES on compound chemical profile. LC results indicated that ultrasound-assisted extraction of phytochemicals using betaine-based and proline-based deep eutectic solvent application allowed enhanced hydroxycinnamic acids extraction, while the use of proline-based DES resulted in a more diverse compound profile. The highest recovery efficiencies were recorded with DESs giving the highest total phenolic content (80–92 mg EGE//g d.w), total flavonoid content (47–51 QUE/g d.w), antiradical activity (80% at 100 mg/ml) and reducing power (310–468 mg ASE/g extract). Scanning electron microscope (SEM) results further verified DESs intensified the destruction of cell wall structure, and thereby allowed greater release of polyphenolic from grape pomace.

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Funding

This work was supported by the Ministry of Education and Science of Ukraine [grant no. 2403, 2021].

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VV contributed to conceptualization, discussion, supervision, and coordination of the whole study, data analysis, main manuscript designing, editing, and finalization. GV contributed to preparation of NADESs, extraction, cyclic voltammetry analysis writing–review and editing draft. MS contributed to definition density. SF contributed to  viscosity study. JZ contributed to definition 1H nuclear magnetic resonance. OG contributed to SEM analysis. OL contributed to formal analysis.

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Correspondence to Victoria Vorobyova.

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Vorobyova, V., Vasyliev, G., Skiba, M. et al. Green extraction of phenolic compounds from grape pomace by deep eutectic solvent extraction: physicochemical properties, antioxidant capacity. Chem. Pap. 77, 2447–2458 (2023). https://doi.org/10.1007/s11696-022-02635-w

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  • DOI: https://doi.org/10.1007/s11696-022-02635-w

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