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Preparation method of high-substituted etherified corn starch

A technology of corn starch and high degree of substitution is applied in the field of preparation of high degree of substitution etherified corn starch, which can solve problems such as low degree of substitution, and achieve the effects of low cost, reduced consumption and easy promotion.

Active Publication Date: 2018-08-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the waste and conventional cellulose produced in the potato starch production process, it can only prepare etherified starch with low and medium substitution degrees.

Method used

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  • Preparation method of high-substituted etherified corn starch
  • Preparation method of high-substituted etherified corn starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 10g of starch and dissolve it with 30ml of absolute ethanol, stir it with a glass rod and pour it into a 250ml three-neck flask, add 0.5wt% (relative to the quality of dry starch) nanocellulose, stir and mix for 0.5h, and adjust the temperature of the water bath to 50 ℃, add 16wt% NaOH for alkalinization for 0.5h, add 5wt% monochloroacetic acid solution (concentration is 70wt%) and join the three-necked flask, stop the etherification reaction after mechanical stirring for 4h, wash and centrifuge with methanol solution with a volume fraction of 80% Sodium chloride is not contained in the product (checked with silver nitrate aqueous solution), and the pH is adjusted to neutral with glacial acetic acid, and then the product is dried in an oven at 45° C. to obtain etherified starch in the form of white powder.

[0046] Measure the degree of substitution of the etherified product by acid titration, accurately weigh 0.5g of the sample, place it in a 50ml small beaker, ad...

Embodiment 2

[0058] Weigh 10g of starch and dissolve it with 30ml of absolute ethanol, stir it with a glass rod and pour it into a 250ml three-neck flask, add 3wt% (relative to the mass of dry starch) nanocellulose, stir and mix for 0.5h, and adjust the temperature of the water bath to 50°C , add 18wt% NaOH to alkalinize for 1h, add 5wt% monochloroacetic acid solution (concentration is 70wt%) and join into the there-necked flask, terminate the etherification reaction after mechanical stirring for 5h, wash and centrifuge to the product with a volume fraction of 80% methanol solution Sodium chloride is not contained in the product (tested with silver nitrate aqueous solution), and the pH is adjusted to neutral with glacial acetic acid, and then the product is dried in an oven at 45°C to obtain white powdery etherified starch.

[0059] The degree of substitution of the etherified product was determined to be 0.73 by acid titration.

Embodiment 3

[0061] Weigh 10g of starch and dissolve it with 30ml of absolute ethanol, stir it with a glass rod and pour it into a 250ml three-necked flask, add 5wt% (relative to the mass of dry starch) nanocellulose, stir and mix for 0.5h, and adjust the temperature of the water bath to 50°C , add 20wt% NaOH for alkalization for 2h, add 5wt% monochloroacetic acid solution (concentration is 70wt%) and join in the there-necked flask, stop the etherification reaction after mechanical stirring for 6h, wash and centrifuge to the product with 80% methanol solution by volume fraction Sodium chloride is not contained in the product (tested with silver nitrate aqueous solution), and the pH is adjusted to neutral with glacial acetic acid, and then the product is dried in an oven at 45°C to obtain white powdery etherified starch.

[0062] The degree of substitution of the etherified product was determined to be 0.81 by acid titration.

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Abstract

The invention provides a preparation method of high-substituted etherified corn starch. The high-substituted etherified starch is prepared by using corn starch as a raw material in the presence of nano microcrystalline cellulose through a solvent method; the high substitution degree means that the substitution degree is greater than 0.2; the nanocrystalline cellulose is nanocrystalline cellulose NCC having a fiber length of 100 to 500nm. The preparation of etherified starch by using nanocellulose as a catalyst has simple operation, obvious effect and little pollution. The steps are simple andeasy to operate, and the practicality is strong.

Description

technical field [0001] The invention belongs to the field of starch preparation with high substitution degree, in particular to a preparation method of etherified corn starch with high substitution degree. Background technique [0002] Starch is a carbohydrate formed by plants through photosynthesis. As an important energy storage form of plants, its yield is second only to cellulose, and it is a pure natural renewable resource with abundant sources. Starch is widely used in various industrial fields due to its low price, easy degradation and environmental friendliness. Compared with native starch, etherified starch has the advantages of low gelatinization temperature, strong hydrophilicity, good film-forming property, and superior water retention performance. How to reduce the use of chemicals while increasing the degree of substitution of etherification to promote its application performance and market Value is an issue that needs to be addressed now. [0003] Cellulose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12
CPCC08B31/12
Inventor 林兆云杨桂花陈嘉川夏媛媛
Owner QILU UNIV OF TECH
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