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Method for preparing starch nanocrystal

A technology of starch nanocrystals and starch, which is applied in the field of modified starch processing, and can solve the problems of reducing the hydrolysis rate of original starch by acid

Active Publication Date: 2013-12-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies have shown that the starch-lipid complex has a certain resistance to acid, which will reduce the rate of hydrolysis of native starch by acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare 70% methanol aqueous solution, add waxy corn starch after high-pressure homogenization to make starch milk with a mass concentration of 10%, and then Soxhlet extract at 85°C for 12 hours, and vacuum-dry the extracted starch to constant weight .

[0020] Feed the defatted starch and 3M sulfuric acid solution dried to constant weight into the reaction kettle with a starch sulfuric acid solution with a mass volume concentration of 10%. After mixing, place it at 40°C for stirring and hydrolysis at a speed of 200rpm, and control the vacuum in the reaction kettle. The degree is 0.06MPa. After 48 hours of hydrolysis, centrifuge the obtained hydrolyzate, wash the starch nanocrystals in the lower layer with deionized water, and centrifuge until the supernatant is neutral. After precipitation and freeze-drying, the yield of starch nanocrystals was calculated to be 23%, and the median diameter D 50 =150nm.

Embodiment 2

[0022] Prepare 80% aqueous methanol solution, add high-pressure homogenized waxy corn starch to make starch milk with a mass concentration of 20%, extract it at 75°C for 18 hours, and vacuum-dry the extracted starch to constant weight.

[0023] The defatted starch and 3M sulfuric acid solution dried to constant weight were fed into the reaction kettle with a starch sulfuric acid solution with a mass volume concentration of 10%. After mixing, they were stirred and hydrolyzed at 40°C at a speed of 200rpm, and the inside of the reaction kettle was controlled. The degree of vacuum is 0.095MPa. After hydrolysis for 72 hours, the obtained hydrolyzate was centrifuged, and the starch nanocrystals in the lower layer were washed with deionized water, and centrifuged until the supernatant was neutral. After lyophilization, the yield of starch nanocrystals was calculated to be 20%, and the median diameter D 50 =180nm.

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Abstract

The invention discloses a method for preparing starch nanocrystal, and belongs to the field of modified starch processing. The method is based on the principle that lipid layers in waxiness corn starch grains have resistance for acid, the starch is prompted to be crushed because of homogenization treatment under a certain pressure, the lipid is prompted to be digested through Soxhlet extraction by using an alcohol-water solution, a pore structure from outside to inside is formed, then the resistance to the acid is eliminated, and the penetration of the acid inside the starch is prompted under a negative pressure condition so as to accelerate hydrolysis of the starch grains in an amorphous area. The method specifically comprises the following steps: homogenously crushing the starch grains under a pressure of 50-150 MPa, degreasing the crushed starch by using a 70-90% methanol-water solution, and accelerating hydrogen ions in sulfuric acid to rapidly penetrate into the starch grains to be subjected to restrictive hydrolysis under a 0.06-0.1MPa negative pressure condition, so as to prepare the nanocrystal. Through the technical measures, the hydrolysis period of the starch is shortened to be 48-72 hours, the starch nanocrystal yield is greatly improved to be 19-25%, and the particle size distribution is 20-300nm.

Description

technical field [0001] The invention discloses a method for preparing starch nanocrystals, which relates to the techniques of limited starch damage, alcohol degreasing and negative pressure starch hydrolysis, and belongs to the technical field of modified starch processing. Background technique [0002] As a new type of organic nanoparticles, starch nanocrystals have been paid more and more attention by people. As particle emulsifiers and material fillers, starch nanocrystals have been widely studied and applied in the fields of chemistry, materials science and polymer science. At present, the acid hydrolysis method is widely used to prepare starch nanocrystals. However, due to the semi-crystalline structure of starch granules and the dense structure of the granule surface, it is difficult for hydrogen ions to penetrate into the interior of the starch granules during the hydrolysis process. As a result, the hydrolysis time for traditional starch nanocrystal preparation is at...

Claims

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Application Information

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IPC IPC(8): C08B30/18
Inventor 金征宇田耀旗魏本喜胡秀婷陈煌莉赵建伟徐学明谢正军
Owner JIANGNAN UNIV
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