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Hectorite immobilized nano silver/chitosan antibacterial composite membrane for food package, and preparation method and application thereof

A technology of food packaging and hectorite, applied in the field of food packaging materials, can solve problems such as human body injury and nano-silver toxicity, and achieve the effects of reducing harm, good antibacterial effect and wide source of raw materials

Active Publication Date: 2018-06-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, some scholars have found that nano-silver has certain toxicity, which will cause potential harm to the human body.

Method used

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  • Hectorite immobilized nano silver/chitosan antibacterial composite membrane for food package, and preparation method and application thereof
  • Hectorite immobilized nano silver/chitosan antibacterial composite membrane for food package, and preparation method and application thereof
  • Hectorite immobilized nano silver/chitosan antibacterial composite membrane for food package, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of hectorite-immobilized nano-silver / chitosan antibacterial composite film, the specific steps are as follows:

[0044] (1) configure the hectorite solution with a concentration of 0.5g / L, add 1mL of silver ammonia solution with a concentration of 0.01mol / L to the 40mL hectorite solution under stirring, and mix well;

[0045] (2) Place the mixed solution obtained in step (1) in a microwave reactor, set the microwave power to 600W, heat to a temperature of 60°C, and add 10% (relative to the total fraction of the reaction solution) shell with a concentration of 1g / L Polysaccharide quaternary ammonium salt solution, continue to react for 10 minutes, dialyze the obtained hectorite-immobilized nano-silver complex until no silver ions are detected, obtain hectorite-immobilized nano-silver composite antibacterial agent, and set aside;

[0046] (3) configuration chitosan-acetic acid mixed solution (acetic acid is 0.1% relative to the massfraction of chitosan), u...

Embodiment 2

[0049] The preparation of hectorite-immobilized nano-silver / chitosan antibacterial composite film, the specific steps are as follows:

[0050] (1) configure the hectorite solution with a concentration of 0.5g / L, add 1mL of silver ammonia solution with a concentration of 0.01mol / L to the 40mL hectorite solution under stirring, and mix well;

[0051] (2) Place the mixed solution obtained in step (1) in a microwave reactor, set the microwave power to 600W, heat to a temperature of 60°C, and add 10% (relative to the total fraction of the reaction solution) shell with a concentration of 1g / L Polysaccharide quaternary ammonium salt solution, continue to react for 10 minutes, dialyze the obtained hectorite-immobilized nano-silver complex until no silver ions are detected, obtain hectorite-immobilized nano-silver composite antibacterial agent, and set aside;

[0052] (3) configure chitosan-acetic acid mixed solution (acetic acid is 0.5% relative to the massfraction of chitosan), add l...

Embodiment 3

[0055] The preparation of hectorite-immobilized nano-silver / chitosan antibacterial composite film, the specific steps are as follows:

[0056] (1) configuration concentration is the hectorite solution of 5g / L, under stirring, add 5mL concentration of silver ammonia solution that is 1mol / L in 25mL hectorite solution, mix evenly;

[0057] (2) Place the mixed solution obtained in step (1) in a microwave reactor, set the microwave power to 800W, heat to a temperature of 70°C, and add 40% (relative to the total fraction of the reaction solution) shell with a concentration of 5g / L Polysaccharide quaternary ammonium salt solution, continue to react for 30 minutes, dialyze the obtained hectorite-immobilized nano-silver complex until no silver ions are detected, and obtain hectorite-immobilized nano-silver composite antibacterial agent, which is set aside;

[0058] (3) configure chitosan-acetic acid mixed solution (acetic acid is 1% relative to the massfraction of chitosan), add laponi...

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Abstract

The invention discloses a hectorite immobilized nano silver / chitosan antibacterial composite membrane for food package, and a preparation method and application thereof. According to the preparation method, chitosan quaternary ammonium salt is used as a reducing agent to prepare nano silver, the hectorite is used as a template to fix nano silver, so as to prepare a nano silver composite antibacterial agent; then the chitosan is used as a film substance, the hectorite is used as a membrane performance enhancer, glycerol is used as a plasticizer, the chitosan, the hectorite and the glycerol aremixed with the nano silver composite antibacterial agent so as to prepare the hectorite immobilized nano silver / chitosan antibacterial composite membrane for food package. According to the hectorite immobilized nano silver / chitosan antibacterial composite membrane for food package, the release proportion of nano silver is 1-8wt%. When the hectorite immobilized nano silver / chitosan antibacterial composite membrane for food package is applied to food package, nano silver particles for resisting bacteria are not leaked or go into food, so that the toxicity of the nano silver in food application is lowered remarkably, and the potential harm of the nano silver to human body is lowered.

Description

technical field [0001] The invention relates to the field of food packaging materials, in particular to a nano-silver / chitosan antibacterial composite film for food packaging and a preparation method and application thereof. Background technique [0002] In recent years, people have been working hard to find a food packaging material with high antibacterial activity, strong barrier property and environmental friendliness, so as to help prolong the food storage period and improve the food storage environment while reducing environmental pollution. Chitosan is a functional polysaccharide with antibacterial activity, non-toxicity and degradability, which has potential application value in the field of food active packaging materials. However, chitosan food packaging film has the disadvantages of low mechanical strength and low antibacterial activity. Antibacterial properties are easily affected by pH, concentration, relative molecular mass and degree of deacetylation, which li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K9/12C08K3/08C08K3/34C08J5/18
CPCC08J5/18C08J2305/08C08K3/08C08K3/34C08K9/12C08K2003/0806C08K2201/011
Inventor 王小英吴正国孙润仓
Owner SOUTH CHINA UNIV OF TECH
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