Method for extracting sesame protein

Abstract

The invention discloses a method for extracting sesame protein, which comprises a preprocessing procedure and an extraction procedure. The method is characterized in that: in the extraction procedure, a supercritical carbon dioxide is used as a solvent and the extraction conditions are that: extraction pressure is between 7 and 50 MPa; extraction temperature is between 32 and 45 DEG C; desorption temperature is between 30 and 75 DEG C; desorption pressure is between 4 and 8 MPa; and extraction time is between 0.5 and 5 hours. Compared with the sesame protein extracting by the prior art, the sesame protein can wholly keep the original flavor and mouthfeel of sesame; and the flavor and the mouthfeel of a sesame protein product are obviously superior to those of the sesame protein product prepared by the current alkali extraction and acid precipitation method.

Description

Technical field: [0001] The invention belongs to the production technology of natural plant protein, in particular to a method for extracting sesame protein from sesame. Background technique: [0002] Sesame is an annual herb belonging to the family Linaceae. It is one of the oldest oil crops and is known as the "Queen" of oil crops because of its high oil content. Sesame has a long history of planting in my country [0003] Sesame has extremely high nutritional value, has a broad consumer group, and has a wide range of uses. The main component of sesame is oil, with a content of about 50%, followed by protein, which accounts for about 20%. In addition, it also contains various vitamins, carbohydrates, Minerals, dietary fiber. [0004] Plant protein is easily digested and absorbed by the human body, does not contain cholesterol, and is complementary to animal protein in terms of amino acid composition. It has anti-tumor, cholesterol-lowering effects, lowers blood pressure...

AI Technical Summary

Problems solved by technology

[0006] Sesame protein is mainly alkali-soluble protein (67%), and its solubility is relatively large under alkaline conditions, so the basic method of extraction is alkali extraction and acid precipitation method. Separate and remove the insoluble substances in sesame, then adjust the pH value of the leachate to about 4.5 with edible hydrochloric acid, the protein is in the state of isoelectric point and coagulates and precipitates, and the finished sesame protein powder can be obtained after neutralization, pulping and drying. The highest protein content can reach 90%, but the alkaline extraction and acid precipitation process generally has the problem of high ash content and dark color of the product, the main reason is that some organic acids such as citric acid and pyroglutamic acid are left in the process of alkaline extraction, acid precipitation and neutralization Phosphorous compounds such as salts and phytic acid phospholipids, due to the long processing time and high temperature process, the protein is partially denatured, and the sesame protein products obtained through this process have the original unique strong aroma of sesame And the taste is completely lost, transformed into a unique unpleasant fishy smell, and the taste also loses the unique chewing taste that natural plant seeds should have

[0007] Taha et al. used 0.4mol / L NaOH with a solid-to-liquid ratio of 1:25. Using countercurrent extraction, 91.7% of nitrogen-containing substances can be extracted, and concentrated proteins and isolated proteins with very low phytic acid content can be obtained. However, this extraction The method has the problems of high acid and alkali consumption, high ash content, dark color, low protein yield, and environmental pollution.

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