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ZnO-containing chitosan/sodium alginate antibacterial cling film and preparation method thereof

A sodium alginate film and sodium alginate technology are applied in the field of fresh food packaging materials, can solve the problems of poor water resistance and poor water vapor barrier performance of brittle sodium alginate film, and achieve simple methods, high antibacterial performance, Effects of low water solubility and water vapor transmission coefficient

Inactive Publication Date: 2019-02-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a chitosan / sodium alginate antibacterial fresh-keeping film containing ZnO and a preparation method thereof, which overcomes the poor water vapor barrier performance, serious brittleness and sodium alginate film of chitosan film in the prior art Defects such as poor water resistance

Method used

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  • ZnO-containing chitosan/sodium alginate antibacterial cling film and preparation method thereof
  • ZnO-containing chitosan/sodium alginate antibacterial cling film and preparation method thereof
  • ZnO-containing chitosan/sodium alginate antibacterial cling film and preparation method thereof

Examples

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Embodiment 1

[0034] Example 1 (SA / SH-ZnO-1)

[0035] The present embodiment provides a kind of preparation method of chitosan / sodium alginate antibacterial preservative film containing ZnO, comprises the following steps: first prepare starch-ZnO nanoparticle in situ, then prepare chitosan film liquid, and prepare Add ZnO evenly to sodium alginate solution to prepare sodium alginate film solution, cast chitosan film solution on glass plate, dry, then cover sodium alginate film solution on top, cast film, dry, and finally Add chitosan film solution, cast into film. Specific steps are as follows:

[0036] Dissolve 1g of soluble starch in 100ml of deionized water, raise the temperature to 90°C in a magnetic stirrer and stir for 30min until completely dissolved; 0.595g of Zn(NO 3 ) 2 ·6H 2 O was added to the above solution and stirred for 30 minutes; then 50ml of 0.2M NaOH solution was added dropwise, stirred for 2 hours, centrifuged, washed, and dried in an oven at 50°C for 24 hours to obt...

Embodiment 2

[0039] Example 2 (CS / SA / SH-ZnO-2)

[0040] The present embodiment provides a kind of preparation method of chitosan / sodium alginate antibacterial preservative film containing ZnO, and concrete steps are as follows:

[0041] Dissolve 0.5g soluble starch in 100ml deionized water, heat up to 90°C in a magnetic stirrer and stir for 30min until completely dissolved; 0.595g Zn(NO 3 ) 2 ·6H 2 O was added to the above solution and stirred for 30 minutes; then 50ml of 0.3M NaOH solution was added dropwise, stirred for 2 hours, centrifuged, washed, and dried in an oven at 70°C for 24 hours;

[0042] Dissolve 1 mL of glacial acetic acid in 100 mL of deionized water, add 2 g of chitosan and 0.5 g of glycerin, and stir for 1 h until uniform to obtain a chitosan film solution. Add 0.05g of the zinc oxide nanoparticles prepared above into 100ml of deionized water, ultrasonic the probe, the ultrasonic power of the probe is 300W, ultrasonic 3s, intermittent 2s, stir evenly, then add 2g sodi...

Embodiment 3

[0043] Embodiment 3 (CS / SA / SH-ZnO-3)

[0044] The present embodiment provides a kind of preparation method of chitosan / sodium alginate antibacterial preservative film containing ZnO, and concrete steps are as follows:

[0045] Dissolve 2g of soluble starch in 100ml of deionized water, heat up to 90°C in a magnetic stirrer and stir for 30min until completely dissolved; 0.595g of Zn(NO 3 ) 2 ·6H 2 O was added to the above solution and stirred for 30 minutes; then 50ml of 0.1M NaOH solution was added dropwise, stirred for 2 hours, centrifuged, washed, and dried in an oven at 80°C for 24 hours;

[0046] Dissolve 1 mL of glacial acetic acid in 100 mL of deionized water, add 2 g of chitosan and 2 g of glycerin, and stir for 1 h until uniform to obtain a chitosan film solution. Add 0.1g of zinc oxide nanoparticles prepared above into 100ml of deionized water, ultrasonic probe, ultrasonic power of the probe is 400W, ultrasonic 4s, intermittent 1s, stir well, then add 2g sodium algi...

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Abstract

The invention discloses a ZnO-containing chitosan / sodium alginate antibacterial cling film and a preparation method thereof. The preparation method comprises the following steps: preparing ZnO nano particles by taking starch as a dispersing agent and a stabilizer and taking Zn(NO3)2.6H2O as a zinc source; dissolving chitosan in a 1% acetic acid solution, and adding glycerol to prepare a chitosan film solution; dispersing the ZnO nano particles into deionized water, adding sodium alginate and glycerol, carrying out stirring, carrying out ultrasonic dispersion, carrying out standing, and carrying out ultrasonic degassing to obtain a sodium alginate film liquid; and casting the chitosan film liquid into a film, carrying out drying, then casting the sodium alginate film liquid into a film on the surface of the chitosan film, carrying out drying, finally, casting the chitosan film liquid into a film, carrying out drying, and uncovering the film to obtain the antibacterial cling film. The chitosan / sodium alginate / starch-ZnO (CS / SA / SH-ZnO) antibacterial cling film prepared by the method has relatively low water solubility and water vapor permeability coefficient, the antibacterial property is good, and excessive loss of water and microbial pollution in transportation, storage and processing processes of fruits and vegetables can be avoided.

Description

technical field [0001] The invention relates to a ZnO-containing chitosan / sodium alginate antibacterial fresh-keeping film and a preparation method thereof, belonging to the technical field of fresh food packaging materials. Background technique [0002] In the packaging industry, the materials used are mainly petroleum-based plastic materials such as polypropylene (PP), polyethylene (PE) or polystyrene (PS), which are difficult to degrade and thus pose a serious plastic waste problem. As the problem of environmental pollution becomes more and more serious, people urgently need other environmentally friendly materials to replace the use of petroleum-based plastic materials. Natural polysaccharides have attracted increasing attention from researchers because of their abundant sources, renewable, environmentally friendly, low toxicity, biodegradable, and biocompatible properties. In the past decades, many polysaccharides, such as starch, gelatin, cellulose, chitosan, sodium a...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08L5/04C08K3/22C08K5/053C08J5/18
CPCC08J5/18C08J2305/08C08J2405/04C08K5/053C08K2003/2296
Inventor 牛宝龙李文凤王和平王慧芳高向华
Owner TAIYUAN UNIV OF TECH
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