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Antimicrobial and antioxidant oxidized nanocellulose composite film immobilizing nano silver/grape seed extract and preparation method and application thereof

A nanocellulose and grape seed technology, applied in the field of food packaging materials, can solve problems such as human injury and leakage, and achieve the effects of low cost, reduced harm, and stable performance

Inactive Publication Date: 2019-05-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When nano-silver is added to the packaging film as an antibacterial agent, the leakage of a large number of free silver nanoparticles during use will cause damage to the human body

Method used

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  • Antimicrobial and antioxidant oxidized nanocellulose composite film immobilizing nano silver/grape seed extract and preparation method and application thereof
  • Antimicrobial and antioxidant oxidized nanocellulose composite film immobilizing nano silver/grape seed extract and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of oxidized nano-cellulose immobilized nano-silver / grape seed extract antibacterial and anti-oxidation composite film is as follows:

[0038] (1) Use TEMPO to oxidize nanocellulose to obtain oxidized nanocellulose, prepare an oxidized nanocellulose solution with a concentration of 0.5 g / L, add 1 mL of 0.01 mol / L oxidized nanocellulose solution to 40 mL of oxidized nanocellulose solution under stirring Silver ammonia solution, mix well;

[0039] (2) Add 1% (relative to the total fraction of the reaction solution) grape seed extract solution with a concentration of 0.5 g / L to the mixed solution obtained in step (1) at room temperature, and continue the reaction for 5 min. Dialyzing the obtained oxidized nanocellulose-immobilized nano-silver composite until no silver ions can be detected to obtain an oxidized nano-cellulose-immobilized nano-silver composite antibacterial agent;

[0040] (3) Configure an oxidized nanocellulose solution with a mass fraction ...

Embodiment 2

[0043] The preparation of oxidized nano-cellulose immobilized nano-silver / grape seed extract antibacterial and anti-oxidation composite film is as follows:

[0044](1) Use TEMPO to oxidize nanocellulose to obtain oxidized nanocellulose, prepare an oxidized nanocellulose solution with a concentration of 2.5 g / L, add 2 mL of 0.5 mol / L oxidized nanocellulose solution to 40 mL of oxidized nanocellulose solution under stirring Silver ammonia solution, mix well;

[0045] (2) At room temperature, add 7.5% (relative to the total fraction of the reaction solution) grape seed extract solution with a concentration of 1 g / L to the mixed solution obtained in step (1), and continue the reaction for 30 min. Dialyzing the obtained oxidized nanocellulose-immobilized nano-silver composite until no silver ions can be detected to obtain an oxidized nano-cellulose-immobilized nano-silver composite antibacterial agent;

[0046] (3) Configure an oxidized nanocellulose solution with a mass fraction ...

Embodiment 3

[0054] The preparation of oxidized nano-cellulose immobilized nano-silver / grape seed extract antibacterial and anti-oxidation composite film is as follows:

[0055] (1) Use TEMPO to oxidize nanocellulose to obtain oxidized nanocellulose, prepare an oxidized nanocellulose solution with a concentration of 10 g / L, add 5 mL of 0.6 mol / L oxidized nanocellulose solution to 40 mL of oxidized nanocellulose solution under stirring Silver ammonia solution, mix well;

[0056] (2) At room temperature, add 9% (relative to the total fraction of the reaction solution) grape seed extract solution with a concentration of 5 g / L to the mixed solution obtained in step (1), and continue the reaction for 40 min. Dialyzing the obtained oxidized nanocellulose-immobilized nano-silver composite until no silver ions can be detected to obtain an oxidized nano-cellulose-immobilized nano-silver composite antibacterial agent;

[0057] (3) Prepare an oxidized nanocellulose solution with a mass fraction of 2...

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Abstract

The invention discloses an antimicrobial and antioxidant oxidized nanocellulose composite film immobilizing a nano silver / grape seed extract and a preparation method thereof. The composite film adopts the grape seed extract as a reducing agent to prepare the nano silver and oxidized nanocellulose as a template to immobilize the nano silver, so as to prepare and obtain an oxidized nanocellulose composite antimicrobial agent immobilizing the nano silver; and then the oxidized nanocellulose which is taken as a film forming matrix, the grape seed extract which is taken as an antioxidant agent andglycerol which is taken as a plasticizer are mixed with the oxidized nanocellulose composite antimicrobial agent immobilizing the nano silver for preparing the composite film. The composite film andthe preparation method have the advantages that the accumulative releasing rate of the nano silver in the prepared composite film reaches 0.6-6 wt%, thereby being applicable to food packaging; the nano silver particles playing the antimicrobial function do not leak and overflow into foods, thereby greatly reducing the toxicity and the potential hazards of the nana silver particles when being applied to foods; and the composite film possesses an antioxidant function, thereby preventing lipid foods and the like from being oxidized and getting rancid and satisfying the requirements for modern food active packaging.

Description

technical field [0001] The invention relates to the field of food packaging materials, in particular to an oxidized nanocellulose-immobilized nano-silver / grape seed extract antibacterial and anti-oxidation composite film for food packaging and a preparation method and application thereof. Background technique [0002] In recent years, people have been committed to finding a food packaging material with antibacterial, high antioxidant activity, strong barrier properties and environmental friendliness to meet the requirements of modern food active packaging, thereby helping to extend food storage period and improve food storage. Environmental pollution can be reduced at the same time. [0003] Cellulose is a designable, non-toxic and degradable natural polysaccharide, which has potential application value in the field of food active packaging materials, especially through 2,2,6,6-tetramethylpiperidine nitrogen oxide (TEMPO) oxidation of oxidized nanocellulose. The oxidized n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08K5/00C08K5/053C08K3/08C08J5/18C08B15/02
Inventor 王小英吴正国孙润仓
Owner SOUTH CHINA UNIV OF TECH
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