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Preparation method of plant-source slow-release antibacterial aerogel

An airgel and plant-sourced technology, which is applied in pulp beating methods, textiles and papermaking, and fiber raw material processing, can solve the problems of antibacterial agent consumption, high concentration, and damage to the quality of packaged products, so as to extend shelf life, The effect of excellent adsorption performance

Active Publication Date: 2019-06-18
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural plant essential oils in antibacterial packaging sometimes have an excessive release rate of essential oils, resulting in excessive concentration in the packaging, and excessive concentration will damage the quality of the packaged product
In addition, the rapid release of essential oil components leads to the consumption of antibacterial agents in a short period of time, which affects the shelf life of packaged products

Method used

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  • Preparation method of plant-source slow-release antibacterial aerogel
  • Preparation method of plant-source slow-release antibacterial aerogel
  • Preparation method of plant-source slow-release antibacterial aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation of MFC / thyme essential oil slow-release antibacterial airgel by enzyme pretreatment

[0046] (1) Preparation of MFC by enzyme pretreatment

[0047] 1) Beating treatment before Valli: Weigh 360g of dry eucalyptus bleached kraft pulp, soak it for a certain period of time, put it into the Valli beater and add distilled water to dissolve it for a period of time, and stop beating when the beating degree is 30°SR The pulp was shaken dry and stored at 4°C for later use.

[0048] 2) Cellulase pretreatment: add a certain amount of distilled water to make 30°SR pulp into a 10% concentration slurry, then add 6U / g enzyme stock solution, put it in a 60°C water bath for 16 hours, and the reaction is over Then put the slurry into an 80°C water bath and keep it warm for 30 minutes. After inactivating the enzyme, use a Buchner funnel to wash and filter with distilled water. The filtered slurry is stored for future use.

[0049]3) Post-PFI beating treatment: use a PFI refin...

Embodiment 2

[0062] Preparation of MFC / thyme essential oil sustained-release antibacterial airgel by TEMPO oxidation pretreatment

[0063] (1) Preparation of MFC by TEMPO oxidation pretreatment

[0064] 1) Beating treatment before Valli: Weigh 360g of dry eucalyptus bleached kraft pulp, soak it for a certain period of time, put it into the Valli beater and add distilled water to dissolve it for a period of time, and stop beating when the beating degree is 30°SR The pulp was shaken dry and stored at 4°C for later use.

[0065] 2) Put the 1% slurry into a three-necked flask and stir for 4 hours, then pour the mixture of TEMPO (1% of MFC absolute dry weight) and NaBr (10 times the amount of TEMPO) into the container, and use 0.5mol / L Adjust the pH of the NaOH solution to 10.5; use a disposable dropper to drop 10% NaClO solution dropwise into the three-necked flask, and keep the pH of the mixture between 10 and 11 by adding 0.5mol / L NaOH ; When the pH value of the mixed system no longer chan...

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Abstract

The invention relates to a preparation method of a plant-source slow-release antibacterial aerogel. The preparation method comprises following steps: an eucalyptus wood bleached sulfate pulp is takenas a raw material to prepare microfibrillated cellulose MFC, and ultrasonic emulsification technology is adopted to prepare thyme essential oil nanometer emulsion; a MFC water suspension and the thymeessential oil nanometer emulsion are combined and mixed to be uniform at a certain ratio, and freeze-drying is carried out so as to obtain the essential oil / MFC aerogel. The MFC aerogel is high in porosity, ultra low in density, and excellent in adsorption performance, so that absorption of the high-efficiency essential oil with broad-spectrum antibacterial performance by the internal part of theaerogel is realized, essential long term continuous release is realized, the concentration can be maintained at a certain range in a long time period, the plant-source slow-release antibacterial aerogel can be used in refrigerated food antibacterial package, the preparation method is simple and convenient, is economical, and is friendly to the environment, and refrigerated food service life can be prolonged effectively.

Description

technical field [0001] The invention belongs to the field of packaging materials, and relates to antibacterial and slow-release technologies, in particular to a preparation method of plant-derived slow-release antibacterial airgel. Background technique [0002] With the continuous improvement of people's living standards, the safety of food packaging has attracted much attention. Taking packaging as the starting point and food as the center of antibacterial packaging, more and more attention is paid to the green environmental protection and safety of the materials used. Nowadays, the safety, health and environmental performance of chemically synthesized preservatives are questioned, and the application of natural plant-derived preservatives has become the focus of research by researchers. Natural plant essential oils in antibacterial packaging sometimes have an excessively fast release rate of essential oils, resulting in excessively high concentrations in the packaging, and...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21D1/02
Inventor 张正健王晓娟高萌陈蕴智赵艳琳
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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