High carbonyl content oxidation starch and method for making same

A technology of oxidized starch and high carbonyl groups, which is applied in the field of oxidized starch and its preparation, can solve the problems of restricting the wide application of oxidized starch, low degree of oxidation of the product, complicated preparation method, etc., and achieve reduced preparation cost, simple process, and favorable processing and molding Effect

Active Publication Date: 2010-05-19
SICHUAN UNIV
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  • Application Information

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Problems solved by technology

[0005] So far, although the preparation of oxidized starch has been reported, the preparation method is relatively complicated, especially the obtained product has a low degree of oxidation, that is, the carbonyl content is not higher than 6%. In addition, it is prepared in acidic or alkaline medium. The oxidized starch has a serious decrease in molecular weight, which limits the wide application of oxidized starch in industry

Method used

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  • High carbonyl content oxidation starch and method for making same
  • High carbonyl content oxidation starch and method for making same
  • High carbonyl content oxidation starch and method for making same

Examples

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Embodiment 1

[0027] Weigh the dried cornstarch with water to make a starch emulsion with a concentration of 25%, then heat up to 70°C and stir for gelatinization for 0.5 hours, then cool to room temperature, add 150 parts of water and stir evenly; 0.2 hydrogen peroxide was slowly added dropwise, and stirred and reacted at a temperature of 35°C for 6 hours; 200 parts of water was added to the reaction product and stirred evenly, and the supernatant liquid was poured off after standing for stratification, and the emulsion was centrifuged to separate the obtained solid first. Vacuum dry at 35°C for 48 hours, and then dry at 95°C for 12 hours to obtain oxidized starch. Its carbonyl content was measured to be 30.2%, and the yield was 87.1%.

Embodiment 2

[0029]Weigh the dried cornstarch with water to make a starch emulsion with a concentration of 20%, then heat up to 80°C and stir for gelatinization for 1 hour, then cool to room temperature, add 120 parts of water and stir evenly; 3.1 Hydrogen peroxide was slowly added dropwise, and stirred and reacted at a temperature of 15°C for 36 hours; 200 parts of water was added to the reaction product and stirred evenly, and the supernatant liquid was poured out after standing for stratification, and the emulsion was centrifuged to separate the obtained solid first. Vacuum dry at 50°C for 12 hours, and then dry at 95°C for 12 hours to obtain oxidized starch. Its carbonyl content was measured to be 38.5%, and the yield was 83.3%.

Embodiment 3

[0031] Weigh dry cornstarch with water to make a starch emulsion with a concentration of 30%, then raise the temperature to 85°C, stir and gelatinize for 2 hours, cool to room temperature, and then add 120 parts of water to it and stir evenly; 0.5 hydrogen peroxide was slowly added dropwise, stirred and reacted at a temperature of 50°C for 12 hours; 200 parts of water was added to the reaction product and stirred evenly, and the supernatant liquid was poured out after standing for stratification, and the emulsion was centrifuged to obtain a solid First vacuum-dry at 60°C for 12 hours, then dry at 95°C for 12 hours to obtain oxidized starch. Its carbonyl content was measured to be 55.4%, and the yield was 88.5%.

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Abstract

The invention discloses an oxidized starch with high content of carbonyl at 15.5 % to 55.4% and molecular weight of larger than 25000. Moreover, the invention provides a method for preparing the oxidized starch with high content of carbonyl, wherein starch and water are mixed into the starch emulsion at the concentration of 10% to 30%, and then the emulsion is warmed up to 60DEG C to 90DEG C and cooled down to ambient temperature after being gelatinized and mixed for 0.5 to 2 hours, and then 50 to 150 portions of water is added and mixed evenly; subsequently, the hydrogen peroxide with molar ratio to starch of 0.2 to 4 is dripped slowly and the mixing and reaction are conducted at 5DEG C to 50DEG C for 0.5 to 72 hours; 200 portions of water are added in the reaction products and mixed evenly; after stratification, the upper layer of clear liquid is poured, the emulsion is centrifugally separated and the obtained solid is dried to get the oxidized starch. The oxidized starch prepared according to the invention has high content of carbonyl, dramatic thermal stability, low production cost, high yield and simple process, overcoming the problem that the molecular weight is reduced substantially when preparing oxidized starch in acid or alkaline medium.

Description

technical field [0001] The invention belongs to the technical field of oxidized starch and a preparation method thereof, and in particular relates to an oxidized starch with high carbonyl content and a preparation method thereof. Background technique [0002] Starch is a polysaccharide composed of a single type of sugar unit, which is naturally synthesized by plants. It is generally composed of amylose and amylopectin. It is the second largest natural polymer on the earth. Its output is second only to cellulose. It is rich in resources and price low. [0003] Oxidized starch (Oxidized Starch) is the product obtained by oxidation of starch with oxidizing agents in acid, alkali or neutral medium. After physical and chemical modification, the performance of oxidized starch has been greatly improved compared with natural starch, and its application fields are very wide. For example, oxidized starch is used for preparative thermoplastic starch plastics. The material has high te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18
Inventor 汪秀丽张水洞张玉荣王玉忠杨科珂陈思翀
Owner SICHUAN UNIV
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