Modified chitosan / plant essential oil composite film coating liquid as well as preparation method and application thereof

By grafting quaternary phosphorus salt and sorbic acid onto chitosan and combining it with plant essential oils, a modified chitosan/vegetative essential oil composite coating solution was solved, and the problems of poor mechanical properties and weak antibacterial properties of chitosan films in the prior art were solved, and efficient fruit preservation effect was achieved.

CN119678988APending Publication Date: 2025-03-25SOUTH SUBTROPICAL CROP RES INST CHINA ACAD OF TROPICAL AGRI SCI
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Patent Information

Application Number
CN202411872675.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The existing chitosan films have poor mechanical properties and weak antibacterial properties during fruit storage. The antibacterial active ingredients combined with chitosan affect their mechanical properties, resulting in short shelf life time, easy to contaminate and deteriorate.

Method used

Modified chitosan is prepared by grafting quaternary phosphorus salt and sorbic acid onto chitosan, and plant essential oils are formed into a Pickering emulsion through nanocellulose and combined with modified chitosan to form a composite coating liquid.

Benefits of technology

It improves the antibacterial activity and mechanical properties of the modified chitosan film, extends the freshness time, enhances the freshness effect, and reduces the respiration effect of the fruit, maintains the freshness of the peel.

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Abstract

The invention provides a modified chitosan / plant essential oil composite coating liquid as well as a preparation method and application thereof, and belongs to the technical field of fresh-keeping materials. The preparation method of the composite coating liquid comprises the following steps: by taking CNC dispersion liquid as a water phase and origanum essential oil as an oil phase, mixing the oil phase and the water phase, and homogenizing to obtain an emulsion; dissolving the modified chitosan in an acetic acid aqueous solution, adding glycerol, and uniformly mixing to obtain a modified chitosan film-forming base solution; and mixing the emulsion with the modified chitosan film-forming base solution to obtain the modified chitosan / plant essential oil composite film coating solution. Modified chitosan is used as a main film forming material, nanocellulose is used as a reinforcing phase, meanwhile, Origanum vulgare essential oil is prepared into Pickering emulsion through the nanocellulose, the essential oil nano emulsion and the film forming material are compounded, and the composite film coating liquid is constructed. The protective film formed by using the composite coating liquid has excellent antibacterial activity and mechanical properties, long preservation time and good preservation effect.
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