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Straw stalk hemicellulose B preparation method

A technology for rice straw and hemicellulose is applied in the field of production and preparation of rice straw hemicellulose B, which can solve the problems of high production cost, difficult industrialized production, complicated process and the like, and achieves low production cost, good swelling capacity and water holding capacity. , the effect of simple process

Inactive Publication Date: 2010-01-20
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation method of hemicellulose B that is often used at present needs to degrease the raw material first, and then prepare hemicellulose B. The process is more complicated, the production cost is higher, and industrial production is more difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Grind 100 kg of dry rice straw (with a water content of 10%) into 60-mesh granules and mix with 2000 L of NaOH solution with a mass concentration of 2%, shake at 40°C for 20 hours, and neutralize the extract with acetic acid after centrifugation to make the pH of the solution 5.0 , after centrifuging to remove the residue, the filtrate was precipitated with 4 times the volume of 95% ethanol, and finally the precipitate was dried at 60°C for 16 hours, and after fine grinding, 13.0 kg of rice straw hemicellulose B was obtained, wherein the dietary fiber content was greater than 92% ( Neutral detergent fiber method). The appearance of the product is off-white powder, the taste is not harsh, and it dissolves quickly after absorbing water; the viscosity of 2% solution (25°C) is 8.2cps, the water holding capacity is 5.6ml / g; the swelling force is 6.3ml / g.

Embodiment 2

[0018] 50 kilograms of dry rice straw (water content is 12%) is crushed into 40 mesh granules and mixed with 1000L mass concentration of 4% NaOH solution, shaken at 40°C for 6 hours, after the solution is centrifuged, the extract is neutralized with acetic acid to make the pH of the solution 5.0, after centrifuging to remove the residue, the filtrate was precipitated with 4 times the volume of 95% ethanol, and finally the precipitate was dried at 60°C for 24 hours, and after fine grinding, about 6.5 kg of rice straw hemicellulose B was obtained, in which the dietary fiber content was greater than 92 % (determined by neutral detergent fiber method). The appearance of the product is off-white powder, the taste is not harsh, and it dissolves quickly after absorbing water; the viscosity of 2% solution (25°C) is 8.3cps, the water holding capacity is 5.4ml / g; the swelling force is 6.5ml / g.

Embodiment 3

[0020] 50 kilograms of dry rice straw (water content is 10%) is crushed into 80 mesh particles and mixed with 1500L mass concentration of 4% NaOH solution, shaken at 40°C for 12 hours, after the solution is centrifuged, the extract is neutralized with acetic acid to make the pH of the solution 5.0, after removing the residue by centrifugation, the filtrate was precipitated with 4 times the volume of 95% ethanol, and finally the precipitate was dried at 60°C for 12 hours, and after fine grinding, about 6.5 kg of rice straw hemicellulose B was obtained, in which the dietary fiber content was greater than 92 % (determined by neutral detergent fiber method). The appearance of the product is off-white powder, the taste is not harsh, and it dissolves quickly after absorbing water; the viscosity of 2% solution (25°C) is 8.4cps, the water holding capacity is 5.6ml / g; the swelling force is 6.2ml / g.

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PUM

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Abstract

The invention discloses a straw stalk hemicellulose B preparation method, comprising the following steps: after grinding dry straw stalk, mixing the grinded straw stalk with NaOH solution, vibrating at 25-45 DEG C for 6-24h; adjusting the pH value of filtrate to 4.5-5.5 and using 90%-98% of ethanol for precipitation. The invention has the advantages of simple process, high product purity, low production cost and the like, thus being applicable to industrialized production; the yield is 12-14%, the obtained straw stalk hemicellulose B has good physical and chemical properties, low viscosity and good swelling power and water-holding ability and the content of dietary fiber is more than 92%.

Description

technical field [0001] The invention relates to a method for producing hemicellulose, in particular to a method for producing and preparing rice straw hemicellulose B. Background technique [0002] Since the 1960s, as scientists have studied the role of dietary fiber in food, they have found that dietary fiber has important physiological functions for the human body. It has aroused people's new understanding of dietary fiber, thus accelerating the research and development of dietary fiber. Nowadays, dietary fiber has become an important ingredient of health food widely popular in developed countries, and it is officially listed as the "seventh largest nutrient" after sugar, protein, fat, water, minerals and vitamins. According to statistics, there are more than ten kinds of resources that can be developed and utilized for dietary fiber: rice bran, wheat bran, beet pulp, bean dregs, and fruit peels. [0003] my country is a large agricultural country, and rice straw is one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 胡国华吴彬王飞
Owner SHANGHAI NORMAL UNIVERSITY
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