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A degradable double-layer polysaccharide active film and its preparation method

A polysaccharide and active technology, applied in the field of degradable double-layer polysaccharide active film, can solve the problems of poor barrier properties, weak mechanical properties, and insignificant bacteriostatic and fresh-keeping effects, and achieve the effect of enhancing bacteriostatic effect and good mechanical properties.

Active Publication Date: 2022-05-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single chitosan film has poor water vapor barrier properties, weak mechanical properties, and no obvious antibacterial and fresh-keeping effect, which limits its wide application in the packaging field.

Method used

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  • A degradable double-layer polysaccharide active film and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound: 3.08 g of hydroxypropyl-β-cyclodextrin was dissolved in 200 mL of pure water, and stirred continuously at 45°C. Dissolve 0.64g of dihydromyricetin in 3mL of ethanol, and slowly add the above-mentioned hydroxypropyl-β-cyclodextrin solution, continue to stir and react for 6h, and obtain dihydromyricetin / hydroxypropyl-β-cyclodextrin after freeze-drying Fine clathrate.

[0040] (2) Preparation of film-forming solution: Add 4 g of sodium alginate to 200 mL of pure water, stir in a water bath at 60°C for 4 h, add 2 g of glycerin, continue stirring for 2 h, then add 0.4 g of dihydromyricetin / hydroxypropyl-β-cyclo Dextrin inclusion compound, continue stirring for 20 minutes to obtain sodium alginate-dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound film-forming solution I. Add 4g of chitosan to 200mL of 1% (v / v) acetic acid aqueous solution, stir in a water bath at 60°C for 4h, ...

Embodiment 2

[0043] (1) Preparation of dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion complex: 1.54 g of hydroxypropyl-β-cyclodextrin was dissolved in 100 mL of pure water, and stirred continuously at 50°C. Dissolve 0.32g of dihydromyricetin in 1mL of ethanol, and slowly add the above-mentioned hydroxypropyl-β-cyclodextrin solution, continue to stir and react for 4h, and obtain dihydromyricetin / hydroxypropyl-β-cyclodextrin after freeze-drying Fine clathrate.

[0044] (2) Preparation of film-forming solution: Add 2 g of sodium alginate to 100 mL of pure water, stir in a water bath at 55°C for 3 h, add 1 g of glycerin, continue stirring for 1 h, then add 0.1 g of dihydromyricetin / hydroxypropyl-β-cyclo For dextrin inclusion compound, continue to stir for 10 minutes to obtain sodium alginate-dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound film-forming solution I. Add 2g of chitosan to 100mL of 1% (v / v) acetic acid aqueous solution, stir in a water bath at 55°C for 3h...

Embodiment 3

[0047] (1) Preparation of dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound: 2.31 g of hydroxypropyl-β-cyclodextrin was dissolved in 150 mL of pure water, and stirred continuously at 45°C. Dissolve 0.43g of dihydromyricetin in 2mL of ethanol, and slowly add the above-mentioned hydroxypropyl-β-cyclodextrin solution, continue to stir and react for 8h, and obtain dihydromyricetin / hydroxypropyl-β-cyclodextrin after freeze-drying Fine clathrate.

[0048] (2) Preparation of film-forming solution: add 3g of sodium alginate to 150mL of pure water, stir in a water bath at 60°C for 2h, add 1.5g of glycerin, continue stirring for 1.5h, then add 0.45g of dihydromyricetin / hydroxypropyl-β -Cyclodextrin inclusion compound, continue to stir for 30 minutes to obtain sodium alginate-dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound film-forming solution I. Add 3g of chitosan to 150mL of 1% (v / v) acetic acid aqueous solution, stir in a water bath at 60°C for 2h, ad...

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Abstract

The invention discloses a degradable double-layer polysaccharide active film and a preparation method thereof. Sodium alginate and chitosan are respectively dissolved in water and 1% acetic acid aqueous solution, and glycerin is added to the sodium alginate solution and the chitosan solution and dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound, stir evenly, let stand for degassing, respectively obtain sodium alginate-dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion compound Film-forming solution I and chitosan-dihydromyricetin / hydroxypropyl-β-cyclodextrin inclusion complex film-forming solution II. The film-forming solution I and the film-forming solution II are sequentially poured into a film-forming container, and dried to obtain a degradable double-layer polysaccharide active film. The degradable double-layer polysaccharide active film prepared by using the selected raw materials and process of the present invention can not only effectively solve the technical problem that traditional packaging materials cannot be degraded, but also has a wide range of raw materials and a simple preparation process; the obtained composite film has a smooth, uniform and dense surface, and has Good mechanical properties and antibacterial activity have good application prospects.

Description

technical field [0001] The invention belongs to the field of food packaging films, and discloses a preparation method of a degradable double-layer polysaccharide active film and a degradable double-layer polysaccharide active film prepared by the preparation method. Background technique [0002] As an important means of food storage and preservation, food packaging can effectively reduce food spoilage, ensure food safety, and extend food shelf life. Polymer materials of petrochemical origin have been widely used in food packaging due to their good mechanical properties, good barrier properties, and low cost. However, traditional synthetic polymer materials are difficult to degrade, and a large number of discarded food packaging materials have caused serious white pollution to the environment. At the same time, oil is a non-renewable resource, and the limited oil reserves in the world will eventually be exhausted. Green sustainability is the basic concept of my country's cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L5/04C08L5/08C08L5/16B65D65/46
CPCC08J5/18B65D65/466C08J2305/04C08J2305/08C08J2405/16Y02W90/10
Inventor 吴艳萍李茂云罗小琴钟凯黄毅娜高鸿
Owner SICHUAN UNIV
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