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Method for preparing antibacterial edible films

An antibacterial and edible technology, which is applied in the field of preparation of edible films, can solve the problems of insufficient antibacterial ability and off-white color, and achieve the effect of good film-forming effect, off-white color and low temperature

Active Publication Date: 2015-12-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to overcome the defect of insufficient antibacterial ability of common film-forming materials without adding any reaction solvent and auxiliary agent, and to prepare a polysaccharide matrix with high broad-spectrum antibacterial activity by using a mechanical solid-phase activation method The edible film material coupled with ε-polylysine maintains the antibacterial properties of ε-polylysine, can significantly prolong the shelf life of food, and at the same time improve the mechanical properties of the edible film. Approximately colorless translucent

Method used

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  • Method for preparing antibacterial edible films

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The stirring ball mill is used as the reaction device, and the ball milling reaction is carried out by mechanical solid-phase activation method. Pullulan and ε-polylysine are used as raw materials, and the mass ratio is 5:1.5. The mechanical activation time is 5 minutes and the temperature is 25°C. 1. The stirring speed is 415r / min, and the grinding medium is a stainless steel grinding ball of φ5-10mm to prepare the pullulan and ε-polylysine complex. The film-forming solution is prepared according to the ratio that the mass concentration of the compound of pullulan and ε-polylysine is 2g / 100mL, the mass concentration of gelatin is 5g / 100mL, and the mass concentration of glycerin is 1g / 100mL: Dissolve gelatin in distilled water at 80-90°C, cool to 50-60°C, add pullulan and ε-polylysine complex to dissolve, add glycerin after cooling to room temperature, stir evenly, and magnetically stir for 10 minutes. The resulting film-forming solution is poured into a polypropylene p...

Embodiment 2

[0043] The stirring ball mill is used as the reaction device, and the ball milling reaction is carried out by mechanical solid-phase activation method. Chitosan and ε-polylysine are used as raw materials. The mass ratio is 5:1.8. The mechanical activation time is 10 minutes, and the temperature is 25 ° C The stirring speed was 415r / min, and the complex of chitosan and ε-polylysine was prepared. According to the mass concentration of the complex of chitosan and ε-polylysine is 2g / 100mL, the mass concentration of gelatin is 5g / 100mL, and the mass concentration of glycerin is the ratio of 2g / 100mL to prepare the film-forming solution: first gelatin Dissolve in distilled water at 80-90°C, cool to 50-60°C, add chitosan and ε-polylysine complex to dissolve, add glycerin after cooling to room temperature, stir evenly, and magnetically stir for 10 minutes. The film-forming solution is poured into a polypropylene petri dish, placed at room temperature to form a film for 8-10 hours, and...

Embodiment 3

[0045] The stirring ball mill was used as the reaction device, and the ball milling reaction was carried out by mechanical solid-phase activation method. Dextran and ε-polylysine were used as raw materials, and the mass ratio was 5:2. The mechanical activation time was 8 minutes, and the temperature was 25°C. The stirring speed was 415 r / min, and the compound of dextran and ε-polylysine was prepared. According to the mass concentration of the compound of dextran and ε-polylysine is 3g / 100mL, the mass concentration of gelatin is 5g / 100mL, and the mass concentration of glycerin is 1g / 100mL to prepare the film-forming solution: first gelatin Dissolve in distilled water at 80-90°C, cool to 50-60°C, add the esterified compound of dextran and ε-polylysine to dissolve, add glycerin after cooling to room temperature, stir evenly, and magnetically stir for 10 minutes. The film-forming solution is poured into a polypropylene petri dish, placed at room temperature to form a film for 8-10...

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Abstract

The invention discloses a method for preparing antibacterial edible films. The method includes adding polysaccharide materials and epsilon-polylysine into a stirring ball mill and enabling the polysaccharide materials and the epsilon-polylysine to carry out ball-milling reaction at the temperature of 25-50 DEG C for the reaction time of 5-10min to obtain polysaccharide and epsilon-polylysine compounds; adding water into the polysaccharide and epsilon-polylysine compounds, gelatin and glycerin to prepare film forming liquor; coating the film forming liquor to form the antibacterial edible films. A mass ratio of the polysaccharide materials to the epsilon-polylysine is 5:0.8-2.2. The method has the advantages that other solvents can be omitted in reaction procedures, the reaction time is short, the temperature is low, products have light colors, good film forming effects can be realized, the films obtained by the aid of the method have broad-spectrum antibacterial activity, and the toughness and the oxygen barrier capacity of the edible films can be improved.

Description

technical field [0001] The invention belongs to the technical field of food packaging materials, and in particular relates to a preparation method of an edible film with antibacterial function. Background technique [0002] Synthetic polymeric plastic packaging is now widely used commercially. Although these polymer materials have good mechanical properties and barrier properties, plastic products generally contain toxic and harmful substances such as plasticizers, which will bring a lot of potential food safety problems. In recent years, due to the advantages of edible film over chemically synthesized packaging film, the research on it has become a current hot spot. The main materials used to prepare the edible film are food materials such as lipids, proteins and polysaccharides, which can be directly eaten and absorbed by the human body, and there is no problem such as environmental pollution. In addition, it also has the functions of maintaining moisture, isolating oxyge...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/00C08L5/02C08L5/08C08L77/02B65D65/46
CPCY02A40/90Y02W90/10
Inventor 何荣军王宇光赵瑞娜施俊妃孙培龙
Owner ZHEJIANG UNIV OF TECH
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