Preparation method and application of grafted starch

A technology of grafting starch and starch, which is applied in the biological field, can solve the problems of low grafting rate and grafting efficiency, and achieve the effects of small environmental pollution, large-scale production, and mild reaction conditions

Active Publication Date: 2017-03-15
北京颐方生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The methods disclosed in the prior art have the problems of low grafting rate and grafting efficiency, therefore, it is meaningful to provide a new starch modification method

Method used

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  • Preparation method and application of grafted starch
  • Preparation method and application of grafted starch

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A preparation method of grafted corn starch includes the following steps:

[0043] (1) Weigh 2kg of corn starch and disperse it in 18L methanol-water solution (the volume ratio of methanol to water is 10:90) to prepare a corn starch emulsion suspension with a concentration of 10.19%, and put it into an electrolytic cell with a volume of 24L In, weigh 255.6g of sodium sulfate (0.1mol / L) and dissolve it in the corn starch emulsion suspension, and adjust the pH of the corn starch emulsion suspension to 3 with 1 mol / L sulfuric acid. Take 30cm×30cm wire mesh as anode, 30cm×30cm porous graphite as cathode, the distance between the two poles is 5cm, and 14V direct current is applied (cathode current density is 14mA / cm 2 ), and use an aeration device to blow in oxygen at a speed of 0.7L / min (the aeration device contains two vents, and the two vents blow in oxygen at the same time), and the amount of oxygen per liter of corn starch emulsion suspension is about 4.67L, the agitator s...

Embodiment 2

[0047] A preparation method of grafted potato starch includes the following steps:

[0048] (1) Weigh 3kg of potato starch and disperse it in 17L of ethanol-water solution (the volume ratio of ethanol to water is 15:85) to make a potato starch emulsion suspension with a concentration of 15.42%, and put it into an electrolytic cell with a volume of 24L Weigh 193.12g sodium sulfate (0.08mol / L) and dissolve it in the potato starch emulsion suspension, and adjust the pH to 3 with 1mol / L nitric acid. Take 30cm×30cm wire mesh as anode, 30cm×30cm porous graphite as cathode, the distance between the two poles is 6cm, and 12V direct current is applied (cathode current density is 12mA / cm 2 ), and use an aeration device to inject oxygen at a rate of 0.6L / min (the aeration device contains three vent holes, and the three vent holes simultaneously blow oxygen), and the amount of oxygen introduced per liter of starch solution is about 5.29L, The stirrer stirs at a speed of 250 rpm, and reacts f...

Embodiment 3

[0052] A preparation method of grafted tapioca starch includes the following steps:

[0053] (1) Weigh 4kg of tapioca starch and disperse it in 16L methanol-water solution (the volume ratio of methanol to water is 20:80) to prepare a tapioca starch emulsion suspension with a concentration of 20.69% and fill it into an electrolytic cell with a volume of 24L 272.64g sodium sulfate (0.12mol / L) was weighed and dissolved in the tapioca starch milk suspension, and the pH was adjusted to 3 with 1mol / L sulfuric acid. With 30cm×30cm iron wire as anode, 30cm×30cm porous graphite as cathode, the distance between the two electrodes is 5cm, and 13V direct current is applied (the cathode current density is 13mA / cm 2 ) And use the aeration device to inject oxygen at a rate of 0.5L / min (the aeration device contains three vent holes, and the three vent holes simultaneously blow oxygen), the amount of oxygen introduced per liter of starch solution is about 3.75L, stir Stirring at 250 rpm and react...

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Abstract

The invention relates to a preparation method of grafted starch. The preparation method comprises the following steps of firstly adopting an electrical Fenton method to pretreat a prepared starch milk suspension for breaking a starch crystalline region, so that molecular chains of starch molecules are stretched, and more reactive sites capable of being in graft polymerization are exposed; then dropwise adding grafting monomers in a pretreated system, continuously introducing oxygen and electrifiying, enabling generated hydroxyl radicals as an initiator to initiate a graft polymerization reaction of starch molecule free radials and the grafting monomers, and meanwhile avoiding the generation of homopolymers of the grating monomers as much as possible. Grafting treatment is carried out on starch by adopting the method, the grafting ratio can reach 69.2%, the grafting efficiency can reach 87.6%, and the content of the homopolymers is low; the grafted starch prepared by the method has a high water-absorbing quality or film-forming property; and besides, the method is simple in technological operation and post-treatment, mild in reaction condition, time-saving, efficient and little in environmental pollution, and is beneficial for expanding scale production.

Description

Technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a preparation method and application of grafted starch, and more specifically, to the preparation of grafted starch by an electric Fenton method. Background technique [0002] Starch is a high molecular weight carbohydrate, a polysaccharide composed of a single type of sugar unit, which can be divided into amylose and amylopectin. The molecular formula of starch is (C 6 H l0 O 5 ) n , N is the degree of polymerization, C 6 H l0 O 5 It is anhydroglucose unit. [0003] The performance of starch in use will be affected by factors such as temperature, mechanical shear, pH value, salt, etc. Therefore, different applications require starch with different characteristics. Only by adapting to these application requirements can starch be widely used. In order to improve the performance of starch and broaden its application range, it is necessary to modify its structure. The chemical mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/44C08F220/06C08F220/56C08F218/08C08F220/14C08J3/00
CPCC08F251/00C08J3/00C08J2303/02C08F220/44C08F220/06C08F220/56C08F218/08C08F220/14
Inventor 石清东王姣陈赫岩
Owner 北京颐方生物科技有限公司
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