Soy isolate protein/chitosan quaternary ammonium salt composite film and preparation method and application thereof

A technology of chitosan quaternary ammonium salt and soybean protein isolate, which is applied in the field of packaging materials and biomedical materials to achieve good mechanical properties, good water absorption and swelling ability, good mechanical properties and water absorption and swelling ability

Inactive Publication Date: 2018-04-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report about the preparation of soybean protein i

Method used

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  • Soy isolate protein/chitosan quaternary ammonium salt composite film and preparation method and application thereof
  • Soy isolate protein/chitosan quaternary ammonium salt composite film and preparation method and application thereof
  • Soy isolate protein/chitosan quaternary ammonium salt composite film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Disperse 10 g of soybean protein isolate evenly in 60 g of deionized water, add 30 g of 5% NaOH aqueous solution and continue stirring for 2 min to obtain a 10% soybean protein isolate solution. Add 5 g of epichlorohydrin dropwise to the above solution, stir at a medium speed at room temperature for 20 minutes, and then centrifuge at 3000 rpm for 10 minutes to remove air bubbles. Take 30g of the solution and pour it into a 10cm×10cm polytetrafluoroethylene plate, dry naturally at room temperature to obtain a semi-finished film, remove the film, soak the film in 5% acetic acid solution for 30min, then rinse it with running water overnight, and dry it again Finally, the pure soybean protein isolate film is obtained, which is marked as ESHF-0.

Embodiment 2

[0045]10g of soybean protein isolate was uniformly dispersed in 60g of deionized water, 30g of 5% NaOH aqueous solution was added and stirred for 2 minutes to obtain a 10% of soybean protein isolate solution. Add 5 g of chitosan quaternary ammonium salt to 95 g of deionized water, stir for 2 hours at a medium speed, and filter through a 200-mesh filter to obtain a chitosan quaternary ammonium salt solution with a mass fraction of 5%. Take 70g soybean protein isolate solution and 30g chitosan quaternary ammonium salt solution, mechanically stir evenly, add 4.25g epichlorohydrin dropwise to the above blended solution, stir at medium speed at room temperature for 20min, then centrifuge at 3000rpm for 10 minutes to remove bubble. Take 30g of the solution and pour it into a 10cm×10cm polytetrafluoroethylene plate, dry it naturally at room temperature to obtain a semi-finished composite film, remove the film, soak the film in 5% acetic acid solution for 30min, rinse it with running ...

Embodiment 3

[0047] The film materials obtained in Examples 1 and 2 were cut into samples with a size of 1 cm×1 cm. The surface and cross-sectional structure of the membrane material were sprayed with gold by an ion sputtering machine and then observed with a scanning electron microscope.

[0048] figure 1 It is the scanning electron micrograph of the surface and cross-sectional structure of the film material obtained in embodiment 1 and embodiment 2. As can be seen from the picture, the surface of ESHF-0 is uneven, and some small cracks can be seen from the section. This phenomenon is related to the hard and brittle properties of pure soybean protein isolate membrane. In contrast, the surface and cross-sectional structure of ESHF-30 are smoother, and no obvious microphase separation occurs. The results of scanning electron microscopy showed that there was a good affinity between soybean protein isolate and chitosan quaternary ammonium salt molecules.

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Abstract

The invention discloses a composite film taking soy isolate protein and chitosan quaternary ammonium salt as main raw materials and a preparation method of the composite film. The preparation method comprises the following steps: separately dissolving the soy isolate protein and the chitosan quaternary ammonium salt in a NaOH aqueous solution and deionized water; and carrying out processes including blending, cross-linking, centrifuging, drying, washing and the like to prepare the composite film. Experiment results show that by ring-opening reaction of epoxy chloropropane, raw material molecules are cross-linked with one another through covalent bonds. The composite film has good mechanical property and water-absorbing swelling ability, further has good cell and blood consistency, and haspotential application prospect in the field of biomedical materials and the field of packing materials.

Description

technical field [0001] The invention relates to a soybean protein isolate / chitosan quaternary ammonium salt composite film and a preparation method and application thereof, which belong to the field of polymer chemistry, and also belong to the field of biomedical materials and packaging materials. Background technique [0002] With the development of science and technology, polymer materials such as plastics, rubber, synthetic fibers, coatings and adhesives have been widely used in machinery industry, modern agriculture, medical equipment and other fields. Polymer materials are difficult to degrade naturally, and a large amount of toxic substances such as organic solvents and catalysts are used in the production process, and there is no effective harmless treatment method. While polymer materials have brought huge economic benefits to human beings, they have also brought severe environmental problems. Natural polymers such as cellulose, chitin, soybean protein isolate and g...

Claims

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Application Information

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IPC IPC(8): C08L89/00C08L5/08C08K5/151C08J5/18C08J3/24A61L31/04A61L31/14A61L31/16
CPCA61L31/042A61L31/047A61L31/148A61L31/16A61L2300/236A61L2300/252A61L2300/404C08J3/246C08J5/18C08J2389/00C08J2405/08C08K5/1515C08L5/08C08L89/00
Inventor 王行环王子健石雅晴肖宇
Owner WUHAN UNIV
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