Method for preparing acetate porous starch through ultrasonic assistance

A technology of porous starch and acetate, applied in the field of starch modification, can solve problems such as difficult esterification, and achieve the effect of changing the adsorption properties, keeping the pores intact, and improving the degree of substitution

Inactive Publication Date: 2017-06-27
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since porous starch is formed by amylase hydrolyzing the amorphous region of starch, the esterification reaction also mainly occurs in the amorphous region of starch, which makes porous starch more difficult to esterify than ordinary starch

Method used

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  • Method for preparing acetate porous starch through ultrasonic assistance
  • Method for preparing acetate porous starch through ultrasonic assistance
  • Method for preparing acetate porous starch through ultrasonic assistance

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Dissolve 30g of starch in 100mL of phosphate buffer solution with a pH of 4.5, place in a water bath and preheat at 40°C for 40min, then add α-amylase and glucoamylase (α-amylase and Glucoamylase volume ratio = 2:5), reacted for 10 hours under stirring conditions, neutralized with 3% sodium hydroxide solution, finally filtered, washed, dried and pulverized. The prepared porous starch was characterized by scanning electron microscopy.

[0020] (2) Weigh 30g of the porous starch prepared in step (1), dissolve it in 80mL of deionized water, and then add a mixed solution of acetic acid and acetic anhydride with 10% of the mass of the porous starch (the volume ratio of acetic acid and acetic anhydride is 1:3) , adjust the pH of the starch emulsion solution to 8.0 with 3% NaOH solution, then place the starch emulsion solution in an ultrasonic pulverizer, adjust the ultrasonic power to 200W, the time to 150min, and the temperature to 30°C, and finally neutralize it to pH6 ...

Embodiment 2

[0022] (1) Dissolve 30g of starch in 100mL of phosphate buffer solution with a pH of 4.5, place in a water bath and preheat at 40°C for 60min, then add α-amylase and glucoamylase (α-amylase and Glucoamylase volume ratio = 1:3), reacted for 12 hours under stirring conditions, neutralized with 3% sodium hydroxide solution, and finally filtered, washed, dried, and pulverized. The prepared porous starch was characterized by scanning electron microscopy.

[0023] (2) Weigh 30g of porous starch prepared in step (1), dissolve it in 100mL of deionized water, then add a mixed solution of acetic acid and acetic anhydride with 10% of the mass of porous starch (volume ratio of acetic acid and acetic anhydride = 2:5), Adjust the pH of the starch milk solution to 8.5 with a mass concentration of 3% NaOH solution, then place the starch milk solution in an ultrasonic pulverizer, adjust the ultrasonic power to 300W, the time to 120min, and the temperature to 30°C, and finally neutralize it wit...

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Abstract

The invention discloses a method for preparing acetate porous starch through ultrasonic assistance, and belongs to the technical field of starch modification. According to the method, porous starch is prepared through a mixed enzyme method, and esterification is carried out under an ultrasonic condition, thus preparing the acetate porous starch. The substitution degree of the acetate porous starch prepared through the method is 5.59 percent, and is increased by 64.4 percent when being compared with the substitution degree of acetate porous starch prepared without the ultrasonic assistance; when being compared with the degree of crystallinity of porous starch, the degree of crystallinity of the acetate porous starch is reduced by 16.10 percent, and intactness of honeycomb holes of the porous starch is retained.

Description

technical field [0001] The invention discloses a method for preparing acetate porous starch assisted by ultrasonic waves, which belongs to the technical field of starch modification. Background technique [0002] Porous starch is a granular material with adsorption properties that forms honeycomb-shaped pores through the hydrolysis of starch by amylase. Compared with general inorganic adsorbents, porous starch has many advantages such as high efficiency, non-toxicity, safety, and degradability, so porous starch has a good application prospect. Since each D-glucoside in the porous starch has 2-3 hydrophilic hydroxyl groups, the porous starch itself has a certain hydrophilicity, which leads to certain defects in the adsorption of non-hydrophilic substances by the starch. In order to improve the performance of porous starch, modification means can usually be used. Esterification is a commonly used modification method. The esterification reaction is to acetylate part of the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C12P19/14C12P19/04
CPCC08B31/04C12P19/04C12P19/14
Inventor 马晓军杨俊美
Owner JIANGNAN UNIV
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