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Preparation method of gallic acid cross-linked chitosan-gelatin active composite membrane

A technology of gallic acid and chitosan, which is applied in the direction of flexible covering, packaging, wrapping paper, etc., to achieve the effect of simple preparation process, stable performance and extended shelf life

Inactive Publication Date: 2021-05-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no researchers have added gallic acid as both a cross-linking agent and an active substance into biofilms to enhance their mechanical and functional properties.

Method used

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  • Preparation method of gallic acid cross-linked chitosan-gelatin active composite membrane
  • Preparation method of gallic acid cross-linked chitosan-gelatin active composite membrane
  • Preparation method of gallic acid cross-linked chitosan-gelatin active composite membrane

Examples

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Embodiment 1

[0033] A kind of preparation method of chitosan-gelatin-gallic acid cross-linking active composite film is as follows:

[0034] (1) Chitosan is weighed and dissolved in aqueous acetic acid solution, wherein the mass concentration of chitosan is 2%, the mass concentration of acetic acid is 2%, and reacted for 2h at 65° C. to obtain chitosan solution;

[0035] Weighing gelatin and dissolving it in water, the mass concentration of gelatin is 2%, reacting at 60°C for 1.5h, and obtaining gelatin solution after reaction;

[0036] Mix the chitosan solution and the gelatin solution at a ratio of 1:1, react at 60° C. for 2 hours, and keep stirring during this period to fully mix the two to obtain a chitosan-gelatin blend solution;

[0037] (2) Take gallic acid powder by weighing 0.04% of the mass of chitosan-gelatin blended solution, then dissolve it in the water, the consumption ratio of described gallic acid powder and water is 0.1g: 4ml, ultrasonic treatment 5min Make it fully diss...

Embodiment 2

[0041] A kind of preparation method of chitosan-gelatin-gallic acid cross-linking active composite film is as follows:

[0042] (1) Chitosan is weighed and dissolved in aqueous acetic acid solution, wherein the mass concentration of chitosan is 2%, the mass concentration of acetic acid is 2%, and reacted for 2h at 65° C. to obtain chitosan solution;

[0043] Weighing gelatin and dissolving it in water, the mass concentration of gelatin is 2%, reacting at 60°C for 1.5h, and obtaining gelatin solution after reaction;

[0044] Mix the chitosan solution and the gelatin solution at a ratio of 1:1, react at 60° C. for 2 hours, and keep stirring during this period to fully mix the two to obtain a chitosan-gelatin blend solution;

[0045] (2) Take gallic acid powder by weighing 0.08% of the mass of chitosan-gelatin blend solution, then dissolve it in the water, the consumption ratio of described gallic acid powder and water is 0.1g: 5ml, ultrasonic treatment 5min Make it fully dissol...

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Abstract

The invention belongs to the technical field of packaging materials, and particularly relates to a preparation method of a gallic acid cross-linked chitosan-gelatin active composite membrane. The preparation method comprises the following steps: mixing a chitosan solution and a gelatin solution, and uniformly stirring to obtain a chitosan-gelatin blended solution; then preparing a gallic acid aqueous solution, adding the gallic acid aqueous solution into the chitosan-gelatin blended solution, fully stirring, and reacting to obtain a film forming solution; and pouring the film forming liquid into a flat plate, drying to form a film, and lightly stripping the film from the flat plate to obtain the active composite film. The chitosan-gelatin-gallic acid active composite membrane is prepared by taking a chitosan and gelatin blended solution as a membrane matrix, taking gallic acid as a natural cross-linking agent and adding an active substance. The active membrane has the characteristics of good mechanical properties, strong antioxidant and antibacterial capabilities and the like, has no toxic effect on a human body, and is safe and environment-friendly; and the composite membrane can be used as a food packaging material, and can effectively delay the decay process of food, thereby prolonging the shelf life of food.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a preparation method of a chitosan-gelatin active composite film cross-linked by gallic acid. Background technique [0002] At present, plastic-based inert packaging materials have occupied a large market share of food packaging due to their low cost, simplicity and convenience, and are favored by merchants and consumers. However, the excessive use of petroleum-based materials and the difficulty of degrading plastic packaging have brought a great burden to the natural environment. With the development of the food industry, new requirements are put forward for food packaging, that is, packaging materials not only need to meet the basic requirements of maintaining food quality through physical barriers, but also need to have the function of extending the shelf life of food and alleviating its spoilage process nature. Therefore, this poses new challenges to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L89/00C08K5/13C08J5/18C08J3/24B65D65/46
CPCC08J5/18C08J3/246B65D65/466C08J2305/08C08J2389/00C08K5/13
Inventor 张长才石吉勇邹小波李志华黄晓玮郭志明于江刘凯翟晓东申婷婷
Owner JIANGSU UNIV
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