Method for preparing acetic acid esterified modified dextrin and crosslinking acetic acid esterified composite modified dextrin

A technology of acetic esterification and compound modification, which is applied in the field of preparation of dextrin acetate derivatives, can solve problems such as limiting the application of dextrin, achieve the effects of reducing the number of hydrogen bonds, improving the degree of fineness, and strengthening excellent properties

Inactive Publication Date: 2011-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These defects greatly limit the application of dextrin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Prepare dextrin solution: add enzymatic maltodextrin and water to prepare a uniform dextrin solution with a mass concentration of 1%wt;

[0048] (2) Acetic esterification: add 0.1% acetic anhydride to the enzymatic hydrolysis maltodextrin into the prepared dextrin solution, and maintain the pH value of the system at 7 with sodium hydroxide solution during the process of adding acetic anhydride. After reacting for 1 h, the pH value of the system was adjusted to 5 with acid, and then the esterification reaction process of acetate was completed to obtain the crude acetate dextrin.

[0049] (3) Post-refining treatment: After the crude acetate dextrin is decolorized by activated carbon, filtered, ion exchanged and spray-dried, the acetate modified dextrin product is obtained.

[0050] By weighing 10 g of the sample (dry basis) and adding 100 mL of water, stirring to make it fully dissolved, and measuring the light transmittance at a wavelength of 620 nm, it was found tha...

Embodiment 2

[0052] (1) Prepare dextrin solution: add pyrolyzed dextrin and water to prepare a uniform dextrin solution with a mass concentration of 70%;

[0053] (2) Acetic esterification: Add 20% acetic anhydride to the dextrin mass in the prepared dextrin solution. During the process of adding acetic anhydride, use sodium hydroxide solution to maintain the pH value of the system at 11, and react for 24 hours. After the pH value of the system is adjusted to 7 with acid, the esterification reaction process of acetate is completed to obtain the crude product of acetate dextrin.

[0054] (3) Post-refining treatment: After the crude acetate dextrin is decolorized by activated carbon, filtered, ion exchanged and spray-dried, the acetate-modified dextrin product is obtained.

Embodiment 3

[0056] (1) Prepare dextrin solution: add water to the mixture of enzymatic maltodextrin and pyrolyzed dextrin to prepare a uniform dextrin solution with a mass concentration of 35%;

[0057] (2) Acetic esterification: Add 5% acetic anhydride to the dextrin mass in the prepared dextrin solution. During the process of adding acetic anhydride, use sodium hydroxide solution to maintain the pH value of the system at 9, and react for 10 hours. After the pH value of the system is adjusted to 6 with acid, the esterification reaction process of acetate is completed to obtain the crude acetate dextrin.

[0058] (3) Post-refining treatment: The crude acetate dextrin is decolorized by activated carbon, filtered, ion-exchanged, and spray-dried to obtain an acetate-modified dextrin product.

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Abstract

The invention relates to a method for preparing acetic acid esterified modified dextrin and crosslinking acetic acid esterified composite modified dextrin, which comprises two methods, i.e., a direct method and an indirect method. The direct method comprises the steps of directly taking malto dextrin or pyrolyzed dextrin as the raw material and carrying out chemical modification, i.e., acetic acid esterification or crosslinking acetic acid esterification; and the indirect method comprises the steps of taking starch as the raw material, carrying out the chemical modification, i.e., the acetic acid esterification or the crosslinking acetic acid esterification, to obtain corresponding starch derivatives firstly, and then dextrinizing after enzymolysis or pyrolysis to obtain a final product. The method for preparing the crosslinking acetic acid esterified composite modified dextrin further comprises two modification sequences, i.e., crosslinking is carried out before esterification, or the esterification is carried out before the crosslinking. The acetic ester or crosslinking acetic ester dextrin derivatives have the characteristics of good stability, high transparence, strong thickening performance, low hygroscopicity, low retrogradation, freeze-thaw stability, excellent emulsibility and the like.

Description

technical field [0001] The invention relates to a method for preparing dextrin acetate derivatives, in particular to a method for esterifying modified dextrin. Background technique [0002] The meaning of dextrin is very broad, and the products of starch degradation by different methods are collectively called dextrin, but excluding monosaccharides and oligosaccharides. All dextrin products are anhydroglucose polymers with linear, branched and cyclic molecular structures. There are three types of dextrins produced industrially: maltodextrin, cyclodextrin and thermal cracking dextrin. Among them, maltodextrin is produced by enzymatic hydrolysis of starch as raw material; pyrolysis dextrin is produced by heating and pyrolysis under acidic conditions; cyclodextrin is produced by cyclodextrinase. Cyclodextrin has very obvious differences in structure and properties from maltodextrin and cracked dextrin. Maltodextrin and pyrolysis dextrin are relatively similar in structure, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C12P19/14C08B31/00
Inventor 张本山李芬芬
Owner SOUTH CHINA UNIV OF TECH
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