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Soyabean protein/dialdehyde starch/nano silver composite membrane, preparation method and application thereof

A technology of soybean protein and dialdehyde starch, applied in the directions of transportation and packaging, sustainable manufacturing/processing, flexible covering, etc., can solve the problems of easy volatility, limited application of protein film, and high toxicity of small molecular aldehydes, etc. Achieve the effect of improving mechanical properties and water resistance, good antibacterial properties, and broad application prospects

Inactive Publication Date: 2009-06-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the high toxicity and easy volatilization of small molecule aldehydes, the price of transglutaminase is expensive and difficult to obtain in large quantities, which greatly limits the application of protein films in the fields of food packaging and medical materials.

Method used

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  • Soyabean protein/dialdehyde starch/nano silver composite membrane, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Sodium periodate is used to oxidize soluble starch to obtain dialdehyde starch. Dissolve 10 g of soluble starch in 100 mL of NaIO with a concentration of 0.2 mol / L 4 In the solution, use 1mol / L sulfuric acid to adjust the pH to 2, then react at 20°C in the dark for 4 hours, precipitate the product with acetone, wash it with deionized water until neutral, and obtain dialdehyde starch after freeze-drying, which is marked as DAS1.

[0026] (2) Add 10 g of soybean protein, 3 g of glycerol and 150 mL of distilled water into the reaction kettle, stir and disperse at room temperature for 30 minutes, then raise the temperature to 70 ° C, stir and disperse vigorously for 30 minutes to obtain a uniform and stable soybean protein aqueous solution. Cool to room temperature (25°C-35°C), dissolve dialdehyde starch (DAS1), which accounts for 10% of the soybean protein mass, into the soybean protein aqueous solution under vigorous stirring, and simultaneously add a silver nitrate ...

Embodiment 2

[0028] (1) Sodium periodate is used to oxidize soluble starch to obtain dialdehyde starch. Dissolve 10 g of soluble starch in 100 mL of NaIO with a concentration of 0.5 mol / L 4 In the solution, use 1mol / L sulfuric acid to adjust the pH to 3, then react in the dark at 20°C for 4 hours, precipitate the product with acetone, wash with deionized water until neutral, and freeze-dry to obtain dialdehyde starch, which is marked as DAS2.

[0029] (2) Add 10 g of soybean protein, 3 g of glycerol and 150 mL of distilled water into the reaction kettle, stir and disperse at room temperature for 30 minutes, then raise the temperature to 60 ° C, stir and disperse vigorously for 30 minutes to obtain a uniform and stable soybean protein aqueous solution. Cool to room temperature, dissolve the dialdehyde starch (DAS2) that accounts for 20% of the soybean protein mass into the soybean protein aqueous solution under vigorous stirring, and simultaneously add the silver nitrate solution with a co...

Embodiment 3

[0031](1) Sodium periodate is used to oxidize soluble starch to obtain dialdehyde starch. Dissolve 10 g of soluble starch in 100 mL of NaIO with a concentration of 0.8 mol / L 4 In the solution, use 1mol / L sulfuric acid to adjust the pH to 2, then react at 20°C in the dark for 4 hours, precipitate the product with acetone, wash it with deionized water until neutral, and obtain dialdehyde starch after freeze-drying, which is marked as DAS3.

[0032] (2) Add 10 g of soybean protein, 3 g of glycerol and 150 mL of distilled water into the reaction kettle, stir and disperse at room temperature for 30 minutes, then raise the temperature to 90 ° C, stir and disperse vigorously for 30 minutes to obtain a uniform and stable soybean protein aqueous solution. Cool to room temperature, dissolve the dialdehyde starch (DAS3) that accounts for 30% of the soybean protein mass into the soybean protein aqueous solution under vigorous stirring, and simultaneously add the silver nitrate solution w...

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Abstract

The invention discloses a soyabean protein / dialdehyde starch / nano silver composite membrane with an anti-bacterial function and a preparation method thereof. The soyabean protein / the dialdehyde starch / the nano silver composite membrane is prepared by the solution casting method, soybean protein and a plasticizer glycerin are dispersed in water, then the soybean protein aqueous solution and dialdehyde starch as well as silver nitrate solution are evenly mixed, cast and baked to form the membrane; a cross-linking reaction occurs between aldehyde groups on the dialdehyde starch and amino groups on the soybean protein during the membrane forming, and the aldehyde groups further reduce silver ions into nano silver ions at the same time. The invention further discloses application of the composite membrane to being used as a food packaging material and a medical material. The soybean protein / the dialdehyde starch / the nano silver composite membrane has excellent mechanical property and anti-bacterial property and can be quickly degraded in the natural environment.

Description

technical field [0001] The invention belongs to the field of polymer packaging materials, and in particular relates to a packaging film with soybean protein and dialdehyde starch as the matrix—soy protein / dialdehyde starch / nano-silver composite film, which has excellent mechanical properties and antibacterial properties. Background technique [0002] The quality and safety of food has always been a matter of great concern to food companies and consumers. The traditional polyethylene packaging film can only temporarily isolate food contamination from external bacteria, but cannot prevent the reproduction of bacteria in the packaging system. At the same time, the degradation rate of polyethylene materials in nature is slow, and a large amount of use will also bring harm to the environment. Huge pollution. Therefore, the research and development of degradable packaging film with antibacterial function has very important practical significance. [0003] As far as the antibacte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L89/00C08L3/04C08K3/08B65D65/46B65D81/24
CPCY02W90/10
Inventor 邹小武张黎明
Owner SUN YAT SEN UNIV
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