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Multilayer directional controlled release antibacterial film and preparation method and application thereof

An antibacterial film and double film technology, applied in the field of preparation of multi-layer directional controlled release antibacterial films, can solve the problems of inability to add bacteriostatic substances and inability to bond closely together, and achieve highly uniform coating effect and resistance to resistance. The effect of oxygen blocking water to improve and reduce air bubbles

Inactive Publication Date: 2013-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the natural antibacterial substances are not released well in the polylactic acid film, it is impossible to add antibacterial substances when using PLA as a packaging material.
[0005] In view of the respective advantages of proteoglycan composite films and PLA, multilayer films came into being. However, in the actual experimental process, it was found that no matter whether the protein solution formed a film on PLA or PLA formed a film on protein, the two materials formed Membranes are never tightly bonded together

Method used

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  • Multilayer directional controlled release antibacterial film and preparation method and application thereof
  • Multilayer directional controlled release antibacterial film and preparation method and application thereof
  • Multilayer directional controlled release antibacterial film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Accurately weigh 1g PLA, dissolve it in 20mL chloroform, and stir for 20min under the condition of avoiding light; add 0.1g oleic acid to the above solution, continue stirring for 10min, then pour the film-forming solution into a glass plate to form a film, at RH40%, 25 The PLA film was obtained after drying at °C for 4 hours.

[0032] Accurately weigh 2g of zein and dissolve it in 20ml of a mixed solution of ethanol and water with a volume ratio of 95:5, stir well and mix well; add 0.2g catechin to the above solution, stir well and place in boiling water After bumping for 5 minutes, the mixed solution A was obtained.

[0033] Weigh 1 g of zein and dissolve it in 20 ml of a mixed solution of ethanol and water with a volume ratio of 82:18, stir well and mix evenly. Weigh 0.75g of carrageenan and dissolve it in 50ml of distilled water, place it in a magnetic water bath stirring pot at 65°C and stir for 20min. Quickly pour the ethanol / water solution of zein into the carr...

Embodiment 2

[0037] Accurately weigh 2g PLA, dissolve it in 20mL chloroform, and stir for 20min under the condition of avoiding light; add 0.18g oleic acid to the above solution, continue stirring for 10min, then pour the film-forming solution into a glass plate to form a film, at RH40%, 25 PLA films were obtained after drying at °C for 4 h.

[0038] Accurately weigh 1.5g of zein and dissolve it in 20ml of a mixed solution of ethanol and water with a volume ratio of 97:3, stir and mix well; add 0.25g of catechin to the above solution, stir well and place in boiling water After bumping for 7 minutes, the mixed solution A was obtained.

[0039] Weigh 1 g of zein and dissolve it in 20 ml of a mixed solution of ethanol and water with a volume ratio of 80:10, stir well and mix evenly. Weigh 1g of carrageenan and dissolve it in 50ml of distilled water, place it in a magnetic water stirring pot at 65°C and stir for 20min. Weigh 1g of zein and dissolve it to 20ml, stir well and mix evenly. Weig...

Embodiment 3

[0042] Accurately weigh 1.5g PLA, dissolve it in 20mL chloroform, and stir for 20min under the condition of avoiding light; add 0.15g oleic acid to the above solution, continue stirring for 10min, then pour the film-forming solution into a glass plate to form a film, at RH40%, PLA films were obtained after drying at 25 °C for 4 h.

[0043] Accurately weigh 1g of zein and dissolve it in 20ml of a mixed solution of ethanol and water with a volume ratio of 92:8, stir and mix well; add 0.18g of catechin to the above solution, stir well and place in boiling water After bumping for 10 minutes, the mixed solution A was obtained.

[0044] Weigh 1 g of zein and dissolve it in 20 ml of a mixed solution of ethanol and water with a volume ratio of 85:15, stir well and mix evenly. Weigh 1g of carrageenan and dissolve it in 50ml of distilled water, place it in a magnetic water stirring pot at 65°C and stir for 20min. Weigh 1g of zein and dissolve it to 20ml, stir well and mix evenly. Wei...

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Abstract

The invention discloses a multilayer directional controlled release antibacterial film and a preparation method and an application thereof. The method comprises the following steps: 1) preparing a PLA (poly lactic acid) solution; 2) adding glycerol and inverting film to obtain a PLA film; 3) dissolving zein into an ethanol aqueous solution; 4) adding catechin into the solution in the step 3); 5) bumping the mixed solution in the step 4) in boiling water; 6) coating the mixed solution obtained in the step 5) on the PLA film obtained in the step 2) through a coating machine to obtain a double-layer film; 7) preparing a carrageenan aqueous solution; 8) preparing a zein solution; 9) adding the carrageenan aqueous solution into the solution obtained in the step 8); 10) adding antibacterial substance); and 11) coating the mixed solution obtained in the step 10) on the double-layer film obtained in the step 5) through a coating method. The multilayer directional controlled release antibacterial film disclosed by the invention has good mechanical properties, and the water resistance and oxygen resistance performance are improved significantly.

Description

technical field [0001] The invention relates to a preparation method of a multi-layer directional and controlled-release antibacterial film. The raw materials are all food-grade and fully degradable biological materials, and belong to the technical field of deep processing of agricultural and sideline products and food industry. Background technique [0002] Food packaging is an important and effective means to inhibit the growth of pathogenic microorganisms and prevent food spoilage during food processing and storage. Generally speaking, the selection of food packaging materials should consider the feasibility of packaging production on the machine, high water resistance, high oxygen resistance, high oil resistance, and good mechanical properties such as tensile strength, tear resistance, and impact resistance. In particular, in order to prolong the shelf life of food, some studies have added antibacterial substances to food packaging materials for slow release. [0003] T...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/18B32B27/36B32B9/02B32B9/04C08L67/04C08K5/09C08L89/00C08K5/13C08L5/00B65D65/38
CPCY02W90/10
Inventor 尹寿伟尹业充唐传核
Owner SOUTH CHINA UNIV OF TECH
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