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A kind of preparation method and application of grafted starch

A technology for grafting starch and starch, applied in the biological field, can solve problems such as low grafting rate and grafting efficiency, and achieve the effects of less environmental pollution, mild reaction conditions and low homopolymer content

Active Publication Date: 2018-10-02
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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  • A kind of preparation method and application of grafted starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of preparation method of grafted cornstarch, comprises the steps:

[0043] (1) Weigh 2kg of cornstarch, disperse it in 18L of methanol-water solution (the volume ratio of methanol to water is 10:90), make a cornstarch emulsion suspension with a concentration of 10.19%, and put it into an electrolytic cell with a volume of 24L In, take 255.6g sodium sulfate (0.1mol / L) and dissolve in the cornstarch emulsion suspension, adjust the pH of the cornstarch emulsion suspension to be 3 with 1mol / L sulfuric acid. With 30cm×30cm barbed wire as the anode and 30cm×30cm porous graphite as the cathode, the distance between the two electrodes is 5cm, and 14V direct current is applied (the cathode current density is 14mA / cm 2 ), and use an aeration device to feed oxygen at a rate of 0.7L / min (the aeration device contains two vent holes, and the two vent holes are blown into oxygen at the same time), and the amount of oxygen per liter of cornstarch emulsion suspension is about 4....

Embodiment 2

[0047] A kind of preparation method of grafted potato starch, comprises the steps:

[0048] (1) Weigh 3kg of potato starch, disperse it in 17L ethanol-water solution (the volume ratio of ethanol to water is 15:85), make a potato starch emulsion suspension with a concentration of 15.42%, and put it into an electrolytic cell with a volume of 24L 193.12g sodium sulfate (0.08mol / L) was weighed and dissolved in the potato starch emulsion suspension, and the pH was adjusted to 3 with 1mol / L nitric acid. With 30cm×30cm barbed wire as the anode and 30cm×30cm porous graphite as the cathode, the distance between the two electrodes is 6cm, and 12V direct current is applied (the cathode current density is 12mA / cm 2 ), and use the aeration device to feed oxygen at a rate of 0.6L / min (the aeration device contains three vent holes, and the three vent holes are blown into oxygen at the same time), the amount of oxygen per liter of starch solution is about 5.29L, The stirrer stirred at a spee...

Embodiment 3

[0052] A kind of preparation method of grafted tapioca starch, comprises the steps:

[0053] (1) Weigh 4kg of tapioca starch, disperse it in 16L of methanol-water solution (the volume ratio of methanol to water is 20:80), make a cassava starch emulsion suspension with a concentration of 20.69%, and put it into an electrolytic cell with a volume of 24L 272.64g of sodium sulfate (0.12mol / L) was weighed and dissolved in the cassava starch emulsion suspension, and the pH was adjusted to 3 with 1mol / L sulfuric acid. With 30cm×30cm barbed wire as the anode and 30cm×30cm porous graphite as the 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 feed oxygen at a rate of 0.5L / min (the aeration device contains three vent holes, and the three vent holes are simultaneously blown into oxygen), and the amount of oxygen per liter of starch solution is about 3.75L, stirring The d...

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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 relates to the preparation of grafted starch by an electric Fenton method. Background technique [0002] Starch is a high-molecular 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 is an anhydroglucose unit. [0003] The performance of starch will be affected by factors such as temperature, mechanical shear, pH value, salt and so on. Therefore, different application occasions require starch to have different characteristics. Only when it meets 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 stru...

Claims

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Application Information

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Patent Type & Authority Patents(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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