Method for extracting rice bran dietary fibers

Abstract

The invention belongs to the field of food processing, and particularly relates to an extraction method of rice bran dietary fibers. According to the method, a dual-enzyme method of high temperature amylase and protease is used for performing separation and extraction on defatted rice bran, so that the rice bran dietary fibers of which the yield is as high as 37.6% and of which the purity is as high as 89% can be obtained. Through the adoption of the extraction method of the dietary fibers, on one hand, a part of equipment requirements can be avoided, the operation is simple, and the time consumption is short; and on the other hand, the condition for preparing the dietary fibers is mild, the rice bran dietary fibers with higher yield and higher purity can be obtained, the comprehensive utilization of rice bran added value products is realized, and the extraction method can be widely applied to the field of foods, health-care products and the like.

Description

technical field [0001] The invention belongs to the field of food processing, and in particular relates to a method for extracting rice bran dietary fiber. Background technique [0002] Rice bran is the main by-product of rice processing. It is rich in dietary fiber (Dietary fiber, DF) and polyphenols and other physiologically active substances. It is a high value-added resource with great development potential. However, fresh rice bran is prone to rancidity, poor storage stability, and because it contains a large amount of dietary fiber, resulting in low solubility, rough taste, and poor processing properties, which seriously restrict the application of rice bran in food. my country is the world's largest rice-producing country, with an annual output of about 200 million tons of rice, and about 18 million tons of rice bran can be obtained after processing. The development and application potential of rice bran is very huge. Although my country is rich in rice bran resource...

AI Technical Summary

Problems solved by technology

[0005] Physical methods are mainly divided into coarse separation method and membrane separation method, which can better retain the activity of dietary fiber, but the fiber extraction rate of water-insoluble dietary fiber in rice bran is low, coupled with equipment limitations, it is not suitable for industrial production, so it is currently used at home and abroad. The application of the chemical separation method is also very limited, so it has not been applied to actual production; the chemical separation method is simple in process and low in cost, but it will inevitably discharge a large amount of sewage and cause serious pollution to the environment, and the conditions are relatively severe, and it is easy to destroy the structure of dietary fiber and prepare The dietary fiber products usually contain a small amount of protein and starch, and the purity is not high. This method has been used less and less this year; the disadvantage of the enzyme-chemical reagent method is that the product has a deep color, strong alkali taste, and the strong alkali environment also destroys The structure of dietary fiber has been eliminated, so the yield of the product obtained by this method is also low; the method of enzymatic preparation of dietary fiber has mild conditions and can save some equipment requirements, but the process is more complicated and the reaction time is longer. Although the yield of the product Higher, but the purity is relatively low, and the cost is high; the color, smell and purity of the product obtained by the fermentation method are better than other methods, but because the method is still in the research and development stage, the technology is not yet mature

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