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Starch composition, starch-based film, and preparation method of starch-based film

A composition and starch-based technology, applied in the fields of fully biodegradable films, starch-based films and their preparation, can solve problems such as poor water resistance, low mechanical strength, and unsatisfactory degradation rate

Inactive Publication Date: 2013-12-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But although the above-mentioned starch film prepared has good film-forming properties, yet due to the structure of the starch itself, the produced product has shortcomings such as low mechanical strength, poor water resistance, poor wet strength and unsatisfactory degradation rate. limit its wide application

Method used

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  • Starch composition, starch-based film, and preparation method of starch-based film
  • Starch composition, starch-based film, and preparation method of starch-based film

Examples

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preparation example Construction

[0058] The preparation method of the present invention comprises the following steps:

[0059](a) treating the gelatinized liquid of native starch with starch debranching enzyme, and performing a hydrolytic enzymatic cleavage reaction on the native starch to obtain an enzymatic starch paste;

[0060] (b) subjecting the enzymatic starch paste obtained in step a) to inactivation treatment, and then complexing and precipitating it with a polar complexing agent to obtain the starch composition.

[0061] In the present invention, the starch composition is prepared by an enzymatic digestion-compounding agent method, and the amylose content is greater than 90wt%, preferably more than 95wt%, more preferably more than 98wt%.

[0062] The starch debranching enzyme used in the present invention may be pullulanase, isoamylase or a combination thereof. The natural starch used is selected from the group consisting of potato starch, mung bean starch, tapioca starch, pea starch, corn starch,...

Embodiment 1

[0117] Take 600g of natural tapioca starch (amylose content 22wt%) and add it to the reaction kettle, add 0.7 liters of alcohol to disperse, then add 15 liters of 0.5mol / l NaOH solution, and heat at 80°C for gelatinization. Cool the gelatinized starch solution to 40°C, adjust the pH to about 6 with 2M hydrochloric acid solution, add 12g of starch pullulanase, and react for 15 minutes. Then gradually raise the temperature to 80°C, add 1.4 liters of n-butanol for complexation reaction for 2 hours, obtain a precipitate after cooling to room temperature, and centrifuge the precipitate, wash and filter the centrifuged product with alcohol, and dry it in vacuum at 60°C to obtain starch Composition, after testing, the amylose content in the final product is 96wt%.

[0118] Grind the starch composition into powder, weigh 100g of the starch composition powder, add alcohol to disperse, add water to make a starch composition aqueous suspension solution with a mass fraction of 5%, and hea...

Embodiment 2

[0121] Take 750g of potato starch (amylose content about 23wt%), add 0.8 liters of alcohol to disperse, pour the dispersion into the reaction kettle, and then add 16 liters of 0.5mol / l NaOH solution. Heat up to 85°C and maintain for 1.5 hours to fully gelatinize the starch. When cooling to 45°C, add hydrochloric acid to adjust the pH of the starch gelatinization solution to 6, then add 7g isoamylase and 5g pullulanase, and enzymatically hydrolyze for 20 minutes. Then the temperature was raised to 80° C., and 1.3 liters of isoamyl alcohol was added to carry out complexation reaction for 1.5 hours. Cool and stand overnight, and centrifuge to separate the crude starch composition. Wash the crude starch composition with ethanol to remove n-butanol, and then put it into a blast drying oven at 60°C to dry to obtain the final product of the starch composition. The amylose content is 95wt% after testing.

[0122] Grind the starch composition into powder, weigh 100g, add alcohol to d...

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Abstract

The invention relates to starch composition, starch-based film and a preparation method of the starch-based film. The starch composition comprises, by weight, more than 90wt% of straight-chain starch and branched-chain starch. The starch composition is prepared by enzyme digestion and ingredient complexing and is co-mixed with PVA, glycerol, urea and the like and heated to obtain film-casting liquid; after film casting, starch-based film is obtained. The starch composition is high in content of straight-chain starch; the film prepared with the starch composition is less than half as much as the common starch film in water content under the condition of 100% relative humidity, and water resistance is improved significantly; more than 95% of the film can be biologically degraded 60 days after burying, and degradation products are nontoxic and harmless.

Description

technical field [0001] The invention relates to a fully biodegradable film, in particular to a starch composition, a starch-based film and a preparation method thereof, belonging to the field of biochemical industry. technical background [0002] With the improvement of people's living standards and the acceleration of the pace of life, the amount of disposable plastic films is increasing day by day. In order to solve the global plastic pollution and develop the sources of non-petroleum-based plastic raw materials, the research and development of biodegradable plastic films that can degrade in the environment and be assimilated by the environment is a hot spot of concern in various countries. [0003] The natural renewable resources represented by starch can be used in the production of plastic films because of their renewability, low price, biodegradability and environmental friendliness. Starch-degradable plastics have developed rapidly since their inception, and have exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/12C08L29/04C08K13/02C12P19/16C12P19/04C08J5/18
Inventor 刘昌胜陈芳萍胡鸿园袁媛
Owner EAST CHINA UNIV OF SCI & TECH
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