CN-122011450-A - Ultraviolet-resistant film of immobilized anthocyanin as well as preparation method and application thereof

Abstract

The invention discloses an ultraviolet-proof film of immobilized anthocyanin, and a preparation method and application thereof. The method comprises the steps of adding anthocyanin and a connecting agent into a polyvinylamine-co-hydroxyethyl methacrylate (2) copolymer solution to obtain a blending solution, heating the blending solution to react, adding a non-solvent phase into a reaction product to separate out a solid product, drying the solid product, dissolving the solid product in water to obtain a casting solution, carrying out film coating treatment on the casting solution, and drying to obtain the ultraviolet-resistant film containing the immobilized anthocyanin. The prepared ultraviolet-proof film containing the immobilized anthocyanin is used in the packaging fields of foods, medicines and the like. The ultraviolet-proof film containing the immobilized anthocyanin, which is prepared by the method, can realize immobilization of the anthocyanin in a packaging film material, effectively block ultraviolet rays, avoid article pollution caused by loss of the anthocyanin in the packaging process, improve the gas barrier property of the ultraviolet-proof film and prolong the storage period of foods.

Inventors

• WEI SIYI
• WANG SINUO
• HAN MINGYUE
• GUO RONGLI
• ZHANG BEIBEI
• LI JIN
• ZHANG DONGDONG
• SHI HUANXIAN
• ZHANG LIHUA
• ZUO QIUYU

Assignees

• 陕西中医药大学

Dates

Publication Date

20260512

Application Date

20260211

Claims (10)

1. 1. The preparation method of the ultraviolet-resistant film of the immobilized anthocyanin is characterized by comprising the following steps of: adding anthocyanin and a connecting agent into a polyvinyl amine-co-hydroxyethyl methacrylate (2) copolymer solution to obtain a blending solution; Heating the blending solution to react, and adding a reaction product into a non-solvent phase to separate out a solid product; drying the solid product and dissolving the solid product in water to obtain a casting solution; And (3) carrying out film coating treatment on the film casting solution, and drying to obtain the ultraviolet-proof film containing the immobilized anthocyanin.
2. 2. The method for preparing an ultraviolet-resistant film containing immobilized anthocyanin according to claim 1, wherein the mass ratio of the polyvinylamine-co-methacrylic acid (2) hydroxyethyl copolymer, the anthocyanin and the connecting agent is 20 (0.1-0.5): 2-5.
3. 3. The method for preparing an ultraviolet-resistant film containing immobilized anthocyanin according to claim 1, wherein the temperature of the heating reaction of the blending solution is 80-120 ℃.
4. 4. The method of preparing an ultraviolet light-resistant film containing immobilized anthocyanin according to claim 1, wherein the linker comprises one or more of 1, 2-dichloroethane, 1, 2-dibromoethane, 1, 2-difluoroethane, 1, 3-dichloropropane, 1, 3-dibromopropane, 1, 3-difluoropropane, 1, 4-dichlorobutane, 1, 4-dibromobutane, or 1, 4-difluorobutane.
5. 5. The method for preparing an ultraviolet light shielding film containing immobilized anthocyanin according to claim 1, wherein the non-solvent phase is one of methanol, diethyl ether or acetone.
6. 6. The method for preparing an ultraviolet-proof film containing immobilized anthocyanin according to claim 1, wherein the concentration of the film casting solution is 2% -15%.
7. 7. The method for preparing an ultraviolet-resistant film containing immobilized anthocyanin according to claim 1, wherein the drying temperature of the solid product is 60-100 ℃, and the drying temperature of the film casting solution after film coating treatment is 50-100 ℃.
8. 8. An ultraviolet-preventing film of an immobilized anthocyanin, characterized in that the ultraviolet-preventing film containing an immobilized anthocyanin according to any one of claims 1 to 7 is produced by the production method of the ultraviolet-preventing film.
9. 9. The ultraviolet-resistant film containing immobilized anthocyanin of claim 8, wherein the film thickness of the ultraviolet-resistant film is 3-300 um.
10. 10. Use of the ultraviolet light-resistant film containing immobilized anthocyanin according to claim 9 in the packaging field of foods and medicines.

Description

Ultraviolet-resistant film of immobilized anthocyanin as well as preparation method and application thereof Technical Field The invention belongs to the technical field of functional films, and particularly relates to an ultraviolet-resistant film of immobilized anthocyanin as well as a preparation method and application thereof. Background The deterioration problems such as microbial contamination easily occur in the processes of processing, storing and transporting food and consuming the food, the polymer film is a common packaging material for food and medicines, and the modern food industry puts forward the requirement for functional upgrading of the packaging film. The traditional polymer packaging film has single function, can not solve the problem of food deterioration, and the simple packaging is difficult to meet the requirements of long shelf life, regional circulation and no addition of fresh-keeping in the modern food industry. Functional factors are combined with a base material mainly through physical, chemical and biological methods at present to realize functional upgrading of the packaging film, wherein anthocyanin is added into a film material in a common upgrading mode, and meanwhile, the anthocyanin is fixed by adopting electrostatic complexation, hydrogen bonding of macrocyclic chemistry such as cyclodextrin and the like in the prior art so as to solve the problems of easy degradation and easy dissolution. The membrane material prepared by the simple physical doping method can cause functional failure and possibly pollute packaging articles due to anthocyanin migration, loss and aging, and solves the problems that the anthocyanin is easy to degrade and dissolve out by electrostatic complexation, fixation of the anthocyanin by adopting the hydrogen bond action of macrocyclic chemistry such as cyclodextrin and the like, and the method is easy to be influenced by storage environment. The traditional simple package can not meet the requirements of long shelf life, regional circulation and no addition of fresh-keeping in the modern food industry, and the packaging film is promoted to be functionally upgraded to high barrier, antibacterial, antioxidant and the like. Disclosure of Invention The invention provides an ultraviolet-resistant film of immobilized anthocyanin, a preparation method and application thereof, and aims to solve the problems that the anthocyanin-modified packaging film material is easy to degrade and dissolve in the prior art, so that the fresh-keeping and functional requirements of the modern food industry cannot be met. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a preparation method of an ultraviolet-resistant film of immobilized anthocyanin, which comprises the following steps: adding anthocyanin and a connecting agent into a polyvinyl amine-co-hydroxyethyl methacrylate (2) copolymer solution to obtain a blending solution; Heating the blending solution to react, and adding a reaction product into a non-solvent phase to separate out a solid product; drying the solid product and dissolving the solid product in water to obtain a casting solution; And (3) carrying out film coating treatment on the film casting solution, and drying to obtain the ultraviolet-proof film containing the immobilized anthocyanin. Further, the mass ratio of the polyvinylamine-co-methacrylic acid (2) hydroxyethyl copolymer, anthocyanin and the connecting agent is 20 (0.1-0.5) (2-5). Further, the temperature of the heating reaction of the blending solution is 80-120 ℃. Further, the linking agent includes one or more of 1, 2-dichloroethane, 1, 2-dibromoethane, 1, 2-difluoroethane, 1, 3-dichloropropane, 1, 3-dibromopropane, 1, 3-difluoropropane, 1, 4-dichlorobutane, 1, 4-dibromobutane, or 1, 4-difluorobutane. Further, the non-solvent phase is one of methanol, diethyl ether or acetone. Further, the concentration of the film casting solution is 2% -15%. And the drying temperature of the solid product is 60-100 ℃, and the drying temperature of the film casting solution after film coating treatment is 50-100 ℃. The invention also provides an ultraviolet-proof film of the immobilized anthocyanin, which is prepared according to the preparation method of the ultraviolet-proof film containing the immobilized anthocyanin. Further, the film thickness of the ultraviolet-proof film is 3-300 um. The invention also provides application of the ultraviolet-resistant film containing the immobilized anthocyanin in the field of packaging of foods and medicines. Compared with the prior art, the invention has the beneficial effects that: the preparation method provided by the invention uses the polyvinyl amine Co-productionThe preparation method has the advantages that the preparation method can realize uniform dispersion and stable fixation of the anthocyanin in the polymer matrix, avoid the problems of phase separation and aggregation which are easy