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Edible package film based on chitosan and preparation method thereof

A technology of chitosan and packaging film, which is applied in the field of food processing, can solve the problems of insufficient mechanical strength, no heat sealability, insufficient ability to isolate microorganisms, and microbial contamination of edible films, so as to inhibit microbial reproduction, smooth appearance, The effect of good compatibility

Active Publication Date: 2016-10-26
上海翔伟印刷包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far, almost no edible packaging film can be industrialized and commercially applied. The most important reason is that the edible film has insufficient mechanical strength and no heat sealability. Insufficient ability of microorganisms, there is a risk of microbial contamination when used as food packaging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In order to overcome the technical defects of insufficient mechanical strength and no heat sealability of the edible film in the prior art, the present embodiment provides a preparation method of a chitosan-based edible packaging film, which comprises the following steps in turn:

[0023] Step 1: Mix chitosan and glacial acetic acid aqueous solution according to the mass ratio (1-2.5): (97.5-99), place on a magnetic stirrer and stir until the chitosan is completely dissolved, and ultrasonically degas for 30 minutes to obtain clear and transparent The mass fraction is 1%-2.5% chitosan solution;

[0024] Step 2: According to the mass ratio of chitosan to gelatin or starch (1-2): 1, mix the chitosan solution obtained in step 1 with gelatin solution or starch solution, and add chitosan mass 15%-40 % plasticizer glycerin, filter to remove insoluble impurities; place on a magnetic stirrer and stir until evenly mixed, then blend at a constant temperature of 80°C for 10min, coo...

Embodiment 2

[0027] Present embodiment is on the basis of embodiment 1, and as a kind of preferred embodiment, a kind of preparation method of edible packaging film based on chitosan, comprises the following steps successively:

[0028] Step 1: Mix chitosan and glacial acetic acid aqueous solution at a mass ratio of 2:98, place on a magnetic stirrer and stir until the chitosan is completely dissolved, and ultrasonically degas for 30 minutes to obtain a clear and transparent shell with a mass fraction of 2%. polysaccharide solution;

[0029] Step 2: According to the mass ratio of chitosan and gelatin or starch is the ratio of 1.5:1, the chitosan solution gained in step 1 is mixed with gelatin solution or starch solution, and the plasticizer glycerin that adds chitosan quality 25%, Filter to remove insoluble impurities; place on a magnetic stirrer and stir until mixed evenly, then blend at a constant temperature of 80°C for 10 minutes, cool to 25°C, then add propolis with 35% chitosan mass a...

Embodiment 3

[0038] Present embodiment is on the basis of embodiment 1-2, and as a kind of preferred embodiment, in step one, the deacetylation degree of described chitosan is 95%, promptly the chitosan used in the present embodiment is Food grade deacetylated chitosan, the degree of deacetylation is 95%.

[0039] As a preferred embodiment, in step one, the volume fraction of the aqueous solution of glacial acetic acid is 1%, and chitosan can be effectively dissolved.

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Abstract

The invention relates to an edible package film based on chitosan and a preparation method thereof. At present, industrial production and actual commercial application of the edible package film are not promoted due to the most important reasons that the edible package film is poor in mechanical strength and has no hot-sealing property. In the invention, a calendering method is employed, wherein the preparation method includes the steps of: mixing a chitosan solution with a gelatin solution or a starch solution, adding glycerol, propolis and lysozyme, performing temperature-constant blend cooling and then ultrasonic degassing, and allowing the mixture to stand to prepare a composite film liquid; and spreading the composite film liquid in a flat dish, and vacuum-drying the film liquid to prepare the edible package film. Through addition of the gelatin, the starch and the like bio-macro-molecular components, the film-forming performance of the chitosan is improved. The chitosan composite film is improved in mechanical performance, and meanwhile, with addition of the natural anti-bacterial components, propolis and lysozyme, which have synergistic effects, the chitosan composite film, as food packages, can inhibit reproduction of microorganisms and prolong the shelf life of the foods largely, so that the edible package film can be used in industrial production and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of food processing, in particular to a chitosan-based edible packaging film and a preparation method thereof. Background technique [0002] Edible packaging film refers to a film with functional properties formed by the interaction between different molecules using natural edible materials (such as protein, polysaccharide, cellulose and its derivatives, etc.), which can be wrapped, coated, Covering the surface (or inside) of food in the form of microcapsules, it can block the penetration of water vapor, other gases or various solutes, and act as a protective thin layer to prevent the flavor, texture, etc. of the food during storage and transportation. changes, thereby ensuring the quality of food, extending the shelf life of food, or reducing packaging costs. Therefore, it has broad application prospects in the food industry. [0003] But so far, almost no edible packaging film can be industrialized and co...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08L89/00C08L3/02C08L93/00C08K5/053
Inventor 常大伟
Owner 上海翔伟印刷包装有限公司
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