Method for extracting polyphenol from peanut shells

Abstract

The invention discloses a method for extracting polyphenol from peanut shells. The method comprises the following steps that the peanut shells are washed completely, dried and smashed to obtain peanutshell powder, and the peanut shell powder is sieved; an ethanol solution is added into the peanut shell powder, the solid-liquid ratio is 1:(25-1):70, the mixture is subjected to constant-temperaturewater bath for 2 h-6 h at the temperature of 45 DEG C-100 DEG C, and crude extract liquid is obtained; macroporous resin is taken and soaked in a 95% ethanol solution for 24 h-30 h, then the macroporous resin washed by distilled water repeatedly until no ethanol remains, an NaOH solution with the volume four times greater than that of the macroporous resin is used for soaking the macroporous resin for 2 h-5 h, and the macroporous resin is washed by distilled water until the macroporous resin is neutral; the macroporous resin is dried to constant weight at the temperature of 90 DEG C-95 DEG C;the dried macroporous resin is added into the crude extracted liquid, the mixture is vibrated on a vibrator for 24 h-36 h, and after filtering, polyphenol liquid is obtained. The method has the advantages that by adopting the method, the polyphenol can be effectively extracted from the wasted peanut shells, the purity of the extracted polyphenol exceeds 60%, and the surplus value of the peanut shells is fully utilized; the utilization rate of the peanut shells is increased, the utilization range of the peanut shells is expanded, and the economic value of peanuts is improved.

Description

technical field [0001] The invention relates to a method for purifying polyphenols, in particular to a method for purifying polyphenols from peanut shells. Background technique [0002] Plant polyphenols are secondary metabolites in plant tissues. Studies have proved that polyphenols have various biological activities and have positive effects on human health. Peanut is an annual herbaceous plant of the leguminous family, and is an important edible vegetable oil resource. As one of the main peanut producing countries, my country's annual output has reached more than 15 million tons in recent years, ranking first in the world, and the annual peanut shell output has reached 4.5 million tons. [0003] As a by-product of peanuts, peanut shells contain a variety of physiologically active ingredients and have a variety of effects in disease prevention and treatment. Among them, polyphenolic compounds are a type of active ingredients that are abundant in peanut shells. However, t...

AI Technical Summary

Problems solved by technology

However, the development and utilization of peanut resources in my country has not formed an industrial advantage. Peanut shells are used as peanut waste, a small part of which is used to make adhesives, wood-based panels, animal feed and plastic fillers, etc., while most of them are It is undoubtedly a waste to use it as fuel or throw it away as waste residue