Extraction method for grape seed polyphenols

Abstract

The invention discloses an extraction method for grape seed polyphenols, which comprises the following steps: 1) grape seed raw material is dried and then pulverized; 2) the pulverized grape seed raw material is placed in leachate to be subjected to leaching treatment to obtain grape seed raw juice; 3) the grape seed raw juice is filtered to obtain grape seed polyphenols. The extraction method has the benefits as follows: a water-ethanol double aqueous phase system is adopted to replace the traditional leaching method that polyphenols in grape seeds are extracted by a single solvent; as the polarities of leaching solvents can be adjusted better through solvent compounding, not only is the extraction rate of polyphenols in grape seeds increased, but also the selectivity of solvents is improved so as to facilitate follow-up purification, what's more, the solid to liquid ratio of the traditional technology is reduced from 1:20 to 1:1.5 in the whole extraction process, and massive water resource can be saved in the extraction technology.

Description

technical field [0001] The invention relates to the field of grape by-product processing, in particular to a method for extracting grape seed polyphenols. Background technique [0002] Traditional grape seed proanthocyanidins and tannins are extracted using only a single water solvent extraction method. The extraction process often only extracts proanthocyanidins or tannins, and the yield and purity of proanthocyanidins and tannins are not high. Most of the existing methods are as follows: 1. Extraction of polyphenolic substances in grape seeds: solvent leaching method: grape seeds→drying→crushing→leaching (solvent water, solid-liquid ratio 1:20)→filtering→polyphenolic substances in grape seeds crude extract. This method is more effective for extracting tannins in grape seeds, but the extraction effect on proanthocyanidins in grape seeds is poor, and the extraction rate is low, usually lower than 80%, and the purity of the product is low, which will also cause subsequent T...

AI Technical Summary

Problems solved by technology

This method is more effective for extracting tannins in grape seeds, but the extraction effect on proanthocyanidins in grape seeds is poor, and the extraction rate is low, usually lower than 80%, and the purity of the product is low, which will also cause subsequent The burden of purification is heavy, which further increases the energy consumption