Method for extracting soluble dietary fibers from rice bran through extruding-expansion assisted with enzymolysis

A technology of extrusion puffing and assisted enzymatic hydrolysis, which is applied in the fields of food extraction, food science, food hydrolysis, etc., can solve the problems of inconvenient production and extraction, high cost and high cost, and achieve comprehensive utilization, wide application range and practicality. high effect

Inactive Publication Date: 2016-02-24
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, among the existing methods for extracting soluble dietary fiber from rice bran, some extract less dietary fiber, some have higher c

Method used

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  • Method for extracting soluble dietary fibers from rice bran through extruding-expansion assisted with enzymolysis

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Experimental program
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Effect test

Embodiment 1

[0039] a) Material pretreatment: select fresh rice bran, grind the rice bran and pass through a 40-mesh sieve;

[0040] b) Extrusion and expansion treatment: the crushed rice bran is extruded and expanded by a twin-screw extruder, and the extruded and expanded rice bran is cooled to room temperature before being further pulverized. The water content is 10%, the extrusion temperature is 110°C, and the screw speed is 150r / min;

[0041] c) Enzymolysis: add the rice bran after pressurized puffing treatment and further pulverization into boiling water, the weight volume ratio of rice bran to boiling water is 1:50, stir evenly, after cooling to room temperature, add 1.0% α- Amylase, carry out enzymolysis reaction at 70°C and pH 6.0 for 30 minutes;

[0042] d) Enzyme inactivation: Enzyme inactivation is carried out on the rice bran after enzymolysis, and then cooled to room temperature. The enzyme inactivation condition is heating at 105° C. for 10 minutes;

[0043] e) extracting t...

Embodiment 2

[0047] a) Material pretreatment: select fresh rice bran, grind the rice bran and pass through a 40-mesh sieve;

[0048] b) Extrusion and expansion treatment: the crushed rice bran is extruded and expanded by a twin-screw extruder, and the extruded and expanded rice bran is cooled to room temperature before being further pulverized. Moisture content 30%, extrusion temperature 150°C, screw speed 250r / min;

[0049] c) Enzymolysis: add extruded and expanded rice bran into boiling water, the weight-to-volume ratio of rice bran to boiling water is 1:50, stir evenly, and after cooling to room temperature, add 2.5% α- Amylase, carry out the enzymolysis reaction at 90°C and pH 8.0 for 150 minutes;

[0050] d) Enzyme inactivation: Enzyme inactivation is carried out on the rice bran after enzymolysis, and then cooled to room temperature. The enzyme inactivation condition is heating at 100° C. for 15 minutes;

[0051] e) Extract the supernatant: add 55ml of NaOH solution with a mass vol...

Embodiment 3

[0055] a) Material pretreatment: select fresh rice bran, grind the rice bran and pass through a 40-mesh sieve;

[0056] b) Extrusion and expansion treatment: the crushed rice bran is extruded and expanded by using a twin-screw extruder, and after the extruded and expanded rice bran is cooled to room temperature, it is further pulverized. The water content is 10%, the extrusion temperature is 110°C, and the screw speed is 150r / min;

[0057] c) Enzymolysis: add the rice bran after pressurized puffing treatment and further crushing into boiling water, the weight-to-volume ratio of rice bran to boiling water is 1:50, stir evenly, and after cooling to room temperature, add 2.0% α- Amylase, carry out the enzymolysis reaction at 75°C and pH 6.0 for 90 minutes;

[0058] d) Enzyme inactivation: Enzyme inactivation is carried out on the rice bran after enzymolysis, and then cooled to room temperature. The enzyme inactivation condition is heating at 105° C. for 10 minutes;

[0059] e) ...

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Abstract

The invention belongs to the field of processing and storing engineering of agricultural products, and particularly relates to a method for extracting soluble dietary fibers in rice bran through extruding-expansion assisted with enzymolysis. The method comprises the following steps of pretreatment of materials, extruding-expansion treatment, enzymolysis, enzyme deactivation, extraction of supernatant, precipitation and drying. The method disclosed by the invention is used for extracting the soluble dietary fibers from full cream rice bran, and the extraction rate can reach more than 20% which is apparently higher than the extracting rate of extracting the soluble dietary fibers from the rice bran without the extrusion treatment. The increase of the proportion of the soluble dietary fibers can well meet the physiological needs of human bodies. The method is broad in application range, low in cost and high in practicality, and the comprehensive utilization of rice bran products with a high added value is realized.

Description

technical field [0001] The invention belongs to the field of agricultural product processing and storage engineering, and in particular relates to a method for extracting soluble dietary fiber from rice bran with extrusion and expansion-assisted enzymatic hydrolysis. Background technique [0002] Rice bran is a high value-added by-product of rice deep processing. It contains a variety of amino acids, unsaturated fatty acids, dietary fiber and physiologically active substances necessary for the human body, which is of great benefit to human health. In our country, about 10 million tons of rice bran are produced every year. However, at this stage, rice bran is mostly used as feed or abandoned, the effective utilization rate of resources and the added value of products are extremely low, and the resources have not been fully utilized. [0003] Dietary fiber is a mixture of plant carbohydrate polymers, usually found in grains, legumes, vegetables and fruits. According to the s...

Claims

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Application Information

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IPC IPC(8): A23L33/21
CPCA23V2002/00A23V2250/5116A23V2300/14A23V2300/28
Inventor 徐杨王旭梁栋孙扬之
Owner CHINA AGRI UNIV
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