Method of extracting dietary fibers and protein from bean dregs

Abstract

The invention provides a method for extracting dietary fibers and protein from bean dregs. The method comprises the following steps of: 1) pretreating bean dregs; 2) performing leaching, extracting and degreasing; 3) extracting water-insoluble dietary fibers; 4) extracting protein; and 5) extracting water-soluble dietary fibers. The method comprises the specific steps of putting wet bean dregs into a pretreatment device for pretreatment of the bean dregs, crushing the pretreated wet bean dregs into bean dreg powder, drying the bean dreg powder, feeding the dried bean dreg powder into a degreasing device, and performing leaching, extracting and degreasing so as to obtain degreased bean dreg powder; putting the degreased bean dreg powder into a dietary fiber extraction device I, and adding alkali liquor for a reaction with the degreased bean dreg powder so as to obtain supernatant I and precipitate I which is water-insoluble dietary fibers; leading the supernatant I into a protein extraction device, adding acid liquor for a reaction with the supernatant I so as to obtain supernatant II and precipitate II which is protein; and leading the supernatant II into a dietary fiber extraction device II, and adding ethanol so as to obtain precipitate III which is water-soluble diet fibers.

Description

technical field [0001] The invention belongs to the technical field of chemistry and relates to a method for extracting dietary fiber and protein from bean dregs. Background technique [0002] Bean dregs is the main by-product in the processing of soybean products such as tofu and soy milk, accounting for about 15%-20% of the dry weight of whole beans. According to incomplete statistics, if 2 kg of wet bean dregs are produced per 0.5 kg of soybeans processed, the current domestic soybean The food industry produces approximately 20 million tons of wet okara per year. Studies have shown that the dietary fiber in bean dregs accounts for about 50%-60%, crude protein 15%-20%, crude fat 6%-12%, and functions such as multivitamins, minerals, soybean isoflavones, soybean saponins and phytic acid. sexual substance. For a long time because of its extremely high water content (75-85%) and very easy to ferment and deteriorate, it has been mostly discarded as low-value feed and fertili...

AI Technical Summary

Problems solved by technology

In recent years, with the rise of research on bioactive substances, active substances such as a large amount of cellulose, isoflavones, and natural VE contained in bean dregs have been paid more and more attention to, but the extraction of dietary fiber or protein from bean dregs is basically single and difficult. No systematic research has been carried out, and it is still in the laboratory stage, and there are few practical ones for production

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