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Modified starch and manufacturing method and application of modified starch

A starch and modification technology, applied in the field of materials, can solve the problems of low reactivity in the crystallization area and difficult chemical reactions, etc., and achieve the effect of improving chemical reactivity, increasing reactivity, and reducing crystallinity

Active Publication Date: 2012-08-15
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a modified starch and its preparation method and application in view of the low reactivity of the crystallization region inside the starch granule and the difficulty in carrying out chemical reactions. The crystallinity of the modified starch prepared by the present invention is reduced. , the reactivity was significantly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Weigh 10g of tapioca starch, put it into a 150mL beaker, add 40ml of ethanol, stir, and then add 10ml of distilled water to prepare a starch suspension with a mass percentage of 20%. And put the beaker into a 1000mL large beaker, add ice cubes between the beakers, and keep the ice-water mixture with ice cubes that don't melt all the time. The time for ultrasonic to act on tapioca starch is 15s each time, the interval is 5s, and the action is 30min, and the fixed power is 350W. After the ultrasonic wave is over, take it out, immediately measure the temperature of the starch suspension in the beaker with a thermometer and observe the state of the starch suspension after microwave. When the temperature drops to room temperature, use a polarizing microscope to observe the changes of the starch granules and polarized cross. The crystallinity of the starch was analyzed by X-ray diffraction.

[0029] The method of X-ray diffraction analysis includes: using CuKv radiation as th...

Embodiment 2

[0033] Take tapioca starch 10g, put into 150mL beaker, add n-butanol 82ml as dispersant, stir, then add distilled water 18ml, be mixed with the tapioca starch emulsion that mass percent composition is 10%. Other experimental procedures are the same as in Example 1, but the tapioca starch is subjected to ultrasonic waves for 20 minutes, and the power is 400W. The crystallinity of tapioca starch obtained by X-ray diffraction analysis is 23%.

Embodiment 3

[0035] Weigh 10g of tapioca starch, put it into a 150mL beaker, add 28ml of ethyl acetate as a dispersant, stir, then add 7ml of distilled water, and configure a starch suspension with a mass percentage of 30%. The fixed microwave power is 160W, and the action time is set to 60s. Take it out after the microwave action is over, measure the temperature of the starch suspension in the beaker immediately with a thermometer and observe the state of the starch suspension after the microwave. When the temperature drops to room temperature, observe the changes of the starch granules and polarized crosses with a polarizing microscope.

[0036] The crystallinity of tapioca starch obtained by X-ray diffraction analysis is 24%.

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Abstract

The invention discloses modified starch and a manufacturing method and application of the modified starch. The manufacturing method of the modified starch provided by the invention comprises the following steps: dispersing starch by an organic solvent, adding water and uniformly mixing to prepare a starch suspension, and performing the microwave or the ultrasonic treatment to obtain the modified starch. According to the invention, crystalline regions in modified starch granules are greatly reduced, and the crystallinity of the modified starch granules is decreased from 15-45% to 8-30%. After the crystallinity is decreased, cassava starch is used for manufacturing dialdehyde starch, hydroxypropyl starch and octenyl succinic anhydride starch ester and has obviously improved reactivity.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a modified starch and its preparation method and application. Background technique [0002] At present, the starting materials of most energy sources, organic synthetic materials, and petrochemical products mainly rely on fossil resources such as petroleum. Since petroleum is a non-renewable resource, the excessive consumption of petroleum resources by human society has caused petroleum resources to decrease day by day. Therefore, looking for other resources that can replace oil has become an urgent problem to be solved in the scientific research of this century. Natural polymers come from animals, plants and microorganisms in nature, and they are inexhaustible and renewable resources. Moreover, after these materials and finished products are discarded, they are easily decomposed by natural microorganisms into water, carbon dioxide and small inorganic molecules, which are environmentall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08L3/02
Inventor 蓝平蓝丽红廖安平李冬雪陈阿明封余贤
Owner GUANGXI UNIV FOR NATITIES
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