Chitosan-cyanine pigment / carboxylated graphene oxide film and preparation method thereof

Chitosan-anthocyanin/carboxylated graphene oxide films were prepared by a layer-by-layer self-assembly method, which solved the problem of insufficient performance of chitosan films and achieved improved high-efficiency ultraviolet blocking, mechanical strength and antioxidant properties, making them suitable for food packaging.

CN119660152BActive Publication Date: 2026-07-24NANJING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411655556.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2026-07-24
Estimated Expiration
2044-11-19

AI Technical Summary

Technical Problem

When chitosan is made into films on its own, it has weak mechanical properties and poor UV blocking ability, water resistance and thermal stability, which cannot meet the basic requirements of food packaging.

Method used

A layer-by-layer self-assembly method is used to form a multilayer film by combining anthocyanin-doped chitosan with carboxylated graphene oxide through electrostatic interactions and hydrogen bonds. The antioxidant properties of anthocyanin and the conjugated structure of carboxylated graphene oxide are utilized to absorb ultraviolet light, thereby enhancing mechanical and barrier properties.

Benefits of technology

It improves the film's UV blocking ability, mechanical properties, thermal stability, and antioxidant properties, while maintaining good transparency and water resistance, making it suitable for food packaging.

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Abstract

The application discloses a chitosan-cyanine / carboxylated graphene oxide film and a preparation method thereof. The application uses a glass slide as a substrate, alternately assembles chitosan with opposite charges and carboxylated graphene oxide on the substrate, and dries the film to obtain a layer-by-layer self-assembly film with different double layers. The modified film has greatly improved ultraviolet blocking capacity, maintains good transparency, and has enhanced mechanical performance and water blocking performance, and has good antioxidant performance. The application selects carboxylated graphene oxide as an assembly material for the first time, and has the advantages of mild conditions, simple process, no introduction of other impurities in the modification process, no generation of other by-products and the like.
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