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Method for preparing chitosan-based composite preservative film or coating

A composite fresh-keeping and chitosan technology, applied in the direction of chitin polysaccharide coatings, coatings, hyaluronic acid coatings, etc., can solve the problems of white pollution, refractory degradation, human health hazards, etc., to inhibit oxidation, extend shelf life, shelf life prolonged effect

Inactive Publication Date: 2013-09-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under certain medium environment and temperature conditions, some harmful substances will dissolve out of these materials and transfer to food in a very small amount, thus causing potential harm to human health
In addition, most of these plastic products come from non-renewable petroleum resources and are difficult to degrade. After being discarded, they will seriously damage the ecological environment and cause white pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] A preparation method of chitosan-based composite plastic wrap or coating, the steps are as follows:

[0017] (1) Add 0.3-1.8g chitosan to 30g 2wt% acetic acid aqueous solution, add 0-0.36g glycerin at the same time, stir at 20-50°C at a speed of 300 rpm until completely dissolved, and obtain Chitosan solution;

[0018] (2) Add 0.06-0.48g of vitamin C, honeysuckle extract, wolfberry extract, grape seed extract or tea polyphenols to 30g of water, stir at 20-30°C until completely dissolved, and obtain vitamin C and honeysuckle extract , Lycium barbarum extract, grape seed extract or tea polyphenols and other functional substance aqueous solutions;

[0019] (3) Mix the prepared chitosan solution with vitamin C, honeysuckle extract, wolfberry extract, grape seed extract or tea polyphenols and other functional substances in a volume ratio of 1:1, and heat at 50 ° C Stir at a speed of 300 rpm for 30 minutes to obtain a chitosan-based composite plastic wrap film liquid;

[0...

Embodiment 1

[0024] (1) Add 1.2g chitosan to 30g 2wt% acetic acid aqueous solution, add 0.36g glycerol at the same time, stir at 300°C at a speed of 300 rpm until completely dissolved, and prepare a chitosan solution; ( 2) Add 0.48g of tea polyphenols to 30g of water, and stir at 30°C until completely dissolved to obtain an aqueous solution of tea polyphenols; (3) Mix the prepared chitosan solution and aqueous solution of tea polyphenols in a volume ratio of 1:1 (4) At room temperature, use ultrasonic vibration for 20 minutes to remove the chitosan-based composite fresh-keeping film. Air bubbles in the film liquid; (5) casting the chitosan composite fresh-keeping film film liquid obtained through the above steps and drying at 50°C to form a film.

Embodiment 2

[0026] Same as Example 1, the difference is: (1) Add 1.8g chitosan to 30g 2wt% acetic acid aqueous solution, add 0.18g glycerin at the same time, stir at a speed of 300 rpm at a temperature of 50°C until completely dissolved , to prepare a chitosan solution; (2) Add 0.36g of grape seed extract to 30g of water and stir at 30°C until completely dissolved to obtain an aqueous solution of grape seed extract; (3) Prepare the prepared chitosan solution Mix with the grape seed extract aqueous solution at a volume ratio of 1:1, and stir at 50° C. at a speed of 300 rpm for 30 minutes to prepare a chitosan-based composite plastic wrap film liquid.

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PUM

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Abstract

The invention relates to a method for preparing a chitosan-based composite preservative film or a coating, belonging to the technical field of food preservation. According to the technical scheme, the method comprises the following steps: dissolving chitosan in an aqueous solution of acetic acid, adding an aqueous solution of natural active substances with antioxidant and antibacterial functions, heating, stirring and ultrasonically defoaming to obtain the chitosan-based composite preservative film or a coating film solution; casting and drying the chitosan-based composite preservative film or the coating film solution to obtain a chitosan-based composite preservative film; and coating the chitosan-based composite preservative film or the coating film solution on the surface of food so as to obtain the chitosan-based composite preservative coating. According to the prepared chitosan-based composite preservative film or the coating, the antibacterial performance and the moisture resistance of the chitosan film are improved, and the chitosan-based composite preservative film or the coating is endowed with novel antioxidant functions and has degradable and edible characteristics. When meat, oil or fruit and vegetable foods are packaged or coated by the obtained chitosan-based composite preservative film or the coating, the quality guarantee period can be effectively prolonged, and the chitosan-based composite preservative film or the coating has wide application prospect.

Description

technical field [0001] The invention relates to a chitosan-based composite preservative film or coating and a preparation method thereof. The chitosan-based composite preservative film or coating film liquid is prepared by adding natural functional substances into a chitosan solution, and is flow-cast Film forming is used to pack food or coat food surface to form a coating, which can effectively inhibit food spoilage and deterioration caused by microbial pollution and oxidation, and prolong the shelf life of food, which belongs to the technical field of food preservation. Background technique [0002] With the improvement of people's living standards, the quality and safety of food are more and more widely concerned by consumers. People hope that the food they buy can be fresh, nutritious, healthy and safe. Microbial contamination and oxidation are the main causes of food spoilage. There are major economic losses caused by food spoilage every year all over the world. Deter...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K5/053C08K5/1545C08K5/00C08K5/1535C08J5/18C09D105/08C09D7/12B65D65/46
Inventor 周江王丽岩王倩冯子倩田方园范雪莹潘则同任丽丽佟金
Owner JILIN UNIV
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