Method for preparing modified soybean protein and pectin composite film

A soy protein and composite film technology, which is applied in the field of natural polymer film materials and photosensitive, can solve problems such as toxicity and destroy the biocompatibility of soy protein, achieve low cost, good promotion and application prospects, and avoid chemical cross-linking agents. effect used

Inactive Publication Date: 2018-02-23
SHANGHAI URBAN CONSTR VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many modification methods of soybean protein, such as physical blending, chemical modification (such as reaction with carboxyl, amino and other groups in the SPI structure), etc., due to the good biocompatibility and biodegradability of SPI film, Therefore, it has been widely used, but in the actual materialization process, many chemical cross-linking agents are used to cross-link it and improve the mechanical properties, but these chemical cross-linking agents are more or less toxic, so Destroys the original biocompatibility of soy protein

Method used

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  • Method for preparing modified soybean protein and pectin composite film
  • Method for preparing modified soybean protein and pectin composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation of embodiment 1 photosensitive monomer VM

[0018] Dissolve 37.0g of 7-hydroxy-4-methylcoumarin, 14.14g of KOH, 2g of polyvinyl alcohol (PEG2000), and an appropriate amount of potassium iodide in 100mL of deionized water, and heat to 40°C with stirring. After 10 minutes, 30.4 g of p-chloromethylene styrene (treated by basic alumina column chromatography) was added, and reacted at 40° C. for 48 hours. After the system was cooled, the product precipitated in water to obtain a milky yellow solid. The product was dissolved in tetrahydrofuran, precipitated in a 3:1 mixture of methanol and water, and repeated three times to obtain a white solid. Finally, the purified product was vacuum-dried at 40°C for 12 hours to obtain the photosensitive monomer VM.

Embodiment 2

[0019] The preparation of the urea buffer solution of embodiment 2pH≈8.5

[0020] Use 8mol / L urea solution to prepare 0.1mol / L NaOH solution, 0.4mol / L boric acid solution and 0.4mol / L KCl solution respectively, then pipette 10.1ml NaOH solution, 12.5ml boric acid solution and 12.5ml KCl solution respectively Put the solution in a 100mL volumetric flask, and dilute to volume with 8mol / L urea solution to obtain a urea buffer solution with pH ≈ 8.5.

Embodiment 3

[0021] The preparation of embodiment 3 modified soybean protein

[0022] Add 3g soybean protein isolate and 100mL 8mol / L urea buffer solution with pH ≈ 8.5 to the three-neck flask, stir at 60°C for 40min under nitrogen, then add 300uL mercaptoethanol, react for 1h, and then add 50mL Composite initiator (0.1mol / L) and 3gVM monomer reacted at 60°C for 4h and then stopped the reaction. Pour the reaction product into 1L acetone for sufficient precipitation, centrifuge, extract the obtained precipitate with THF in a Soxhlet extractor for 24 hours to remove unreacted monomers and homopolymers, and dry the obtained product in a vacuum Dry to constant weight in a container to obtain the modified product SPI-VM. Composite initiators are potassium persulfate and ammonium cerium nitrate.

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Abstract

The invention discloses a method for preparing a modified soybean protein and pectin composite film. Firstly, a photosensitive primitive VM is introduced into a soybean protein chain structure and then compounded with pectin macromolecules, and the film is formed through a tape casting method. The VM primitive existing in the composite film can generate a photodimerization reaction under ultraviolet light induction, the interior of the film is subjected to crosslinking, and the mechanical property can be improved. The system is a natural polymer compound system, a new material is provided forthe packaging field, and application and popularization value is achieved.

Description

technical field [0001] The invention belongs to the field of natural polymer film materials and photosensitive technology, and in particular relates to a preparation method of a composite film of modified soybean protein and pectin. Background technique [0002] In recent years, with the depletion of non-renewable resources such as oil, coal, and natural gas, modern chemical industry is facing the plight of shortage of raw materials. On the other hand, serious environmental pollution caused by modern chemical industry is increasing day by day. Therefore, people gradually shift their attention to chitosan, starch, cellulose and soybean protein and other renewable, biodegradable, environmentally friendly natural polymers. Soybean protein (SPI) is a natural polymer made of various amino acids connected by peptide bonds. It has the advantages of biodegradability, extremely rich resources, fast regeneration speed, and relatively cheap price. Therefore, people are interested in th...

Claims

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Application Information

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IPC IPC(8): C08L5/06C08L51/00C08K5/053C08J5/18C08F289/00C08F212/14
Inventor张翠
OwnerSHANGHAI URBAN CONSTR VOCATIONAL COLLEGE