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

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

Example Embodiment

[0030] Example 1:

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

[0032] Accurately weigh 2g of zein and dissolve it into 20ml of a 95:5 volume ratio of ethanol and water mixed solution, fully stir and mix well; add 0.2g catechins to the above solution, stir well and place in boiling water Boil for 5 minutes to obtain mixed solution A.

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

Example Embodiment

[0036] Example 2:

[0037] Accurately weigh 2gPLA, dissolve it in 20mL chloroform and stir for 20min under dark conditions; add 0.18g oleic acid to the above solution, continue stirring for 10min, then pour the film-forming liquid into the glass plate to form a film at RH40%, After drying at °C for 4 hours, a PLA film was obtained.

[0038] Accurately weigh 1.5g of zein and dissolve it into 20ml of a mixture 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 then put it in boiling water Medium bumping for 7 minutes, then mixed solution A is obtained.

[0039] Weigh 1g of zein and dissolve it into 20ml of a mixed solution of ethanol and water with a volume ratio of 80:10, stir and mix well. Weigh 1g of carrageenan and dissolve it in 50ml of distilled water, and place it in a stirring pot of magnetic water at 65°C for 20 minutes. Weigh 1g of zein and dissolve it to 20ml, stir and mix well. Weigh 0.75 g of...

Example Embodiment

[0041] Example 3:

[0042] Accurately weigh 1.5g PLA, dissolve it in 20mL chloroform and stir for 20min under dark conditions; add 0.15g oleic acid to the above solution, continue stirring for 10min, then pour the film-forming liquid into the glass plate to form a film, at RH40%, After drying at 25°C for 4 hours, a PLA film was obtained.

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

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

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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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