Preparation method of rice bran dietary fiber

Abstract

The invention relates to a preparation method of rice bran dietary fiber, which comprises the following steps that: (1) rice bran is crushed, passes through a screen which is more than or equal to 30mesh, is added with water to be stirred uniformly, and stays still for 30 to 50min; (2) the prepared water-absorbing swelling rice bran material is added with dilute hydrochloric acid, the pH value is adjusted to be 4.5 to 5.5, and then 1.0 to 1.5 percent of hot temperature resistant amylase is added to be heated to 85 to 100DEG C, and the temperature is maintained for 30 to 40min; (3) dilute sodium hydroxide or potassium hydroxide solution is added, the pH value is adjusted to be 7.5 to 8.5, 1.0 to 1.5 percent of protease with the enzyme activity more than or equal to 500U / g to be heated to 45 to 55 DEG C, and the temperature is maintained for 60 to 90min; (4) the intermediate product is pressed, filtered and washed by water; (5) diluted phosphoric acid is added in to adjust the pH value to be 5.0 to 5.5, 0.1 to 0.2 percent of cellulose is added in to be heated to 45 to 55DEG C, and the temperature is maintained for 50 to 70min; (6) 2 to 5 percent of hydrogen peroxide is added into a sealed container to be stirred for 20 to 30min; and (7) and the product is dried and crushed. The dietary fiber prepared by the invention has delicate taste without roughness, and can serve as the additive in medicine, health food, bread, biscuits, drinks and the like.

Description

technical field [0001] The invention relates to a method for preparing dietary fiber, in particular to a method for preparing dietary fiber with oil-pressed rice bran as raw material. Background technique [0002] Dietary fiber generally refers to the general term of polysaccharide compounds that are not digested and absorbed by the human body, including cellulose, hemicellulose, xylan, pectin, pentosan, etc. According to the size of water solubility, it can be divided into two categories: water-soluble dietary fiber and water-insoluble dietary fiber. More and more experimental data prove that dietary fiber has many health functions, especially in the prevention of modern diseases of affluence, such as regulating blood sugar, preventing constipation, lowering blood fat, losing weight, and preventing cardiovascular diseases. Therefore, the academic circle generally believes that dietary fiber is the seventh largest nutrient after "sugar, protein, fat, mineral matter, vitamin...

AI Technical Summary

Problems solved by technology

[0003] According to reports, there are many raw materials used to prepare dietary fiber, such as bean dregs, wheat bran, bamboo shoots, pomace (skin), oat skin, bagasse, rice bran, etc. At present, wheat bran and bean dregs are the most researched at home and abroad. To prepare dietary fiber as a raw material, although it has been reported to prepare dietary fiber with rice bran as a raw material, there are many defects in the existing preparation methods: either the cost is too high to be marketable, or the taste is too rough to be accepted by consumers, or It is due to poor sensory properties such as color and limited application range, etc.

Rice is the main variety of my country's food crops, accounting for 40% of the country's total grain output. my country's annual rice output accounts for about 37% of the world's total rice output, ranking first in the world. There are about 20 million tons of rice bran in the country's rice processing every year. It is easy to use, part of it is used as feed, and part of it is almost completely unused and wasted