Carboxymethyl starch stearate and its preparation method

A technology of carboxymethyl starch and stearate, applied in the field of compound modified starch, achieves the effects of simple operation, good freeze-thaw stability and easy separation

Inactive Publication Date: 2011-09-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] There is no report about the research on carboxymethyl starch stearate both at home and abroad, and the present invention refers to the preparation method of starch stearate and carboxymethyl cellulose stearate to obtain the product

Method used

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  • Carboxymethyl starch stearate and its preparation method
  • Carboxymethyl starch stearate and its preparation method
  • Carboxymethyl starch stearate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 3g stearic acid is pulverized, crosses 120 mesh sieves, then joins 100g (dry basis) in the carboxymethyl starch that crosses 120 mesh sieves, carboxymethyl starch substitution degree is 0.2081, then adds lipase (enzyme activity 5000u / g , the amount of enzyme added is 0.5g), heated and stirred in a water bath at 45°C, and the stirring rate was 120r / min; while stirring, add distilled water to control the water content of the system to 7%; after 1 hour of reaction, add desiccant and color-changing silica gel, and continue to stir for 3 hours to react End; after the reaction is over, inactivate the enzyme in a boiling water bath for 20 minutes, then wash with industrial alcohol until no precipitation reaction occurs with the silver nitrate solution; put the alcohol in an oven at 45°C to dry the alcohol, and finally sieve to remove the desiccant to obtain the product Carboxylic acid Methyl Starch Stearate.

[0019] Table 1 is the comparison of carboxymethyl starch stearate p...

Embodiment 2

[0024] Add distilled water to control the moisture content of the system to be 8.3%, and all the other operations and formulas are the same as in Example 1.

Embodiment 3

[0026] Lipase consumption is 1.5000g, and all the other operations and prescriptions are the same as in Example 1.

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Abstract

The invention relates to carboxymethyl starch stearate and its preparation method, which belongs to the composite modified starch technical field. The present invention takes carboxymethyl starch as a raw material, a stearic acid as an esterifying reagent, lipase as a catalyst. The invention comprises the following steps: adding a drying agent and using a water-bath kettle as a temperature-controlling device, controlling the stirring rate, preparing composite modified starch-carboxymethyl starch stearate by using a combination of an enzymatic method and a dry method. The product modifies the defects of salt non-tolerance and shear non-tolerance of carboxymethyl starch, the viscosity of the carboxymethyl starch can be substantially raised, therefore the product can be replaced of carboxy methyl starch and is taken as a thickening agent, a stabilizing agent, an emulsifier or a substitute of fat in certain field. The lipase of the invention has the high activity with a pH value from 3 to 11; the dry method has the advantages of high yield, short flow and no wastewater discharge; the catalytic reaction of the enzymatic method has the advantages of low energy consumption, good selectivity and high conversion rate; and the reaction needs less ingredients which is beneficial to late-period isolation.

Description

technical field [0001] A carboxymethyl starch stearate and a preparation method thereof belong to the technical field of compound modified starch. Background technique [0002] There is no report about the research on carboxymethyl starch stearate at home and abroad, and the present invention refers to the preparation method of starch stearate and carboxymethyl cellulose stearate to obtain the product. Among them, the reference materials are: Zhao Xiujuan, Yu Guoping, etc. used lipase to catalyze the synthesis of starch stearate in a solvent-free system; Lu Yanwen, etc. reacted carboxymethyl cellulose and stearic acid chloride in DMF medium to prepare Methylcellulose Stearate. Contents of the invention [0003] Purpose of the present invention: the present invention is designed to connect a long chain group on the carboxymethyl starch in order to overcome the shortcoming that carboxymethyl starch is not resistant to salt and shearing. Stearic acid is a long-chain fatty a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/04
Inventor 张燕萍张杨
Owner JIANGNAN UNIV
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