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Method for modifying dextrin by means of hydroxypropylation

A technology of hydroxypropylation and dextrin, which is applied in the field of hydroxypropylation modified dextrin, can solve the problems affecting product quality and smooth progress of processing technology, restricting the application field of dextrin, etc., so as to increase added value and overcome Defects, performance-improving effects

Inactive Publication Date: 2013-12-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The repolymerization or retrogeneration of dextrin will affect the quality of the product and the smooth progress of the processing technology, and limit the application field of dextrin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Prepare dextrin solution: add maltodextrin and water to make a uniform dextrin solution with a mass concentration of 1%;

[0031] (2) Hydroxypropylation: Add 1% propylene oxide relative to the mass of maltodextrin to the prepared dextrin solution. During the process of adding propylene oxide, nitrogen gas is introduced, and 0.6% sodium hydroxide, react for 1 hour, adjust the pH value of the system to 5.0 with hydrochloric acid, complete the hydroxypropylation reaction process, and obtain crude hydroxypropyl dextrin.

[0032] (3) Post-refining treatment: The crude product of hydroxypropyl dextrin is decolorized by activated carbon, filtered, ion exchanged and spray-dried to obtain hydroxypropyl modified dextrin product. Activated carbon decolorization, filtration, ion exchange and spray drying are all techniques commonly used in the art.

[0033] By weighing 10g of the sample (dry basis) and adding 100mL of water, stirring to dissolve it fully, and measuring the lig...

Embodiment 2

[0035] (1) configuring dextrin solution: adding water to pyrolyzed dextrin is modulated into a uniform dextrin solution with a mass concentration of 70%;

[0036] (2) Hydroxypropylation: Add 50% propylene oxide to the mass of dextrin in the prepared dextrin solution. During the process of adding propylene oxide, nitrogen gas is introduced, and 1.2% relative to the mass of maltodextrin is added. sodium hydroxide, reacted for 48 hours, adjusted the pH value of the system to 7.0 with hydrochloric acid, and completed the hydroxypropylation reaction process to obtain crude hydroxypropyldextrin.

[0037] (3) Post-refining treatment: The crude product of hydroxypropyl dextrin is decolorized by activated carbon, filtered, ion exchanged and spray-dried to obtain hydroxypropyl modified dextrin product.

[0038] The transparency, stability and freeze-thaw stability test results of dextrin after hydroxypropyl modification are basically the same as in Example 1.

Embodiment 3

[0040] (1) Configure dextrin solution: add water to the mixture of maltodextrin and pyrolyzed dextrin to prepare a uniform dextrin solution with a mass concentration of 30%;

[0041] (2) Hydroxypropylation: Add propylene oxide with a mass of 35% of the mixture of maltodextrin and pyrolyzed dextrin to the prepared dextrin solution. During the process of adding propylene oxide, nitrogen gas is introduced, and relative Maltodextrin and pyrolysis paste mixture with 1.0% sodium hydroxide were reacted for 24 hours. After the pH value of the system was adjusted to 6.0 with hydrochloric acid, the hydroxypropylation reaction process was completed to obtain crude hydroxypropyldextrin.

[0042] (3) Post-refining treatment: The crude product of hydroxypropyl dextrin is decolorized by activated carbon, filtered, ion exchanged, and spray-dried to obtain a hydroxypropyl modified dextrin product.

[0043] The transparency, stability and freeze-thaw stability test results of dextrin after hydr...

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Abstract

The invention provides a method for modifying dextrin by means of hydroxypropylation. The method can be a direct method or an indirect method. The direct method is a technique for directly chemically modifying maltodextrin or pyrolytic dextrin by means of hydroxypropylation to directly prepare hydroxypropyl modified dextrin. The indirect method includes adding water into starch which is a raw material to concoct the starch to obtain starch milk with the mass concentration of 1%-50%; feeding nitrogen into the starch milk and adding propylene oxide and sodium hydroxide into the starch milk; enabling the starch milk, the nitrogen, the propylene oxide and the sodium hydroxide to react for 1-48 hours, and regulating a mixture of the starch milk, the nitrogen, the propylene oxide and the sodium hydroxide until a pH (potential of hydrogen) value of the mixture ranges from 5 to 7 so as to obtain crude hydroxypropyl starch; degrading the crude hydroxypropyl starch by an enzymatic degradation process or an acid-heat process to obtain crude hydroxypropyl dextrin with a DE (digestable energy) value of 1-25; degrading the crude hydroxypropyl dextrin by the aid of enzymes, and performing activated carbon decoloration, ion exchange refining, concentration and spray-drying on the degraded crude hydroxypropyl dextrin to obtain a hydroxypropyl modified dextrin product. The method has the advantages that the hydroxypropyl dextrin product prepared by the method is good in stability, coagulation resistance and freeze-thaw stability and high in transparency as compared with an unmodified dextrin product, and the like.

Description

technical field [0001] The invention relates to a hydroxypropylated modified dextrin, in particular to a method for the hydroxypropylated modified dextrin. The invention specifically relates to a method for obtaining hydroxypropylated modified dextrin by using dextrin or starch as a raw material and introducing a hydroxypropyl functional group into the dextrin molecule through a direct or indirect preparation process. Background technique [0002] Dextrin refers to the products of starch degraded by different methods, collectively referred to as dextrin, but does not include 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, thermal cracking dextrin and cyclodextrin. Among them, maltodextrin is produced by enzymatic hydrolysis of starch as raw material; pyrolysis dextrin is produced by heating and pyrolysis under ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C12P19/22C12P19/14C12P19/04
Inventor 张本山汪建平
Owner SOUTH CHINA UNIV OF TECH
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