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Preparation method and purpose of chitosan-Zn compound nano-particle preservative film

A nanoparticle and chitosan technology, which is applied in the preservation of fruits and vegetables, and the preservation and application of food ingredients as antimicrobials, can solve the problems of cumbersome extraction process of natural extracts and poor freshness preservation effect

Active Publication Date: 2019-12-13
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preservatives or fresh-keeping methods also have defects such as cumbersome extraction process and poor fresh-keeping effect of natural extracts in the early stage.

Method used

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  • Preparation method and purpose of chitosan-Zn compound nano-particle preservative film
  • Preparation method and purpose of chitosan-Zn compound nano-particle preservative film
  • Preparation method and purpose of chitosan-Zn compound nano-particle preservative film

Examples

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preparation example Construction

[0032] Concerning the shortcomings of the prior art and packaging fresh-keeping materials that have appeared on the market, the inventors of the present application have invented a chitosan-Zn composite nanoparticle fresh-keeping film and its preparation method and application after in-depth research. The antibacterial property of chitosan is relevant to its molecular weight and degree of deacetylation etc., so the fresh-keeping film of the present invention uses low molecular weight chitosan and Zn 2+ The composite nanoparticles, and in order to improve the adhesion performance of the plastic wrap, a certain amount of starch is added to the film substrate. The preparation method of chitosan-Zn composite nano particle preservative film of the present invention comprises: 1) prepare chitosan-Zn composite nano particle solution by ion cross-linking method; 2) prepare nanocrystalline cellulose, 3) step 1) The prepared chitosan-Zn composite nanoparticle solution, the nanocrystalli...

Embodiment 1

[0062] 1) Preparation of chitosan-Zn composite nanoparticle cling film

[0063] 1.1) Preparation of chitosan-Zn composite nanoparticles solution

[0064] β-chitosan was depolymerized by cellulase (3%, w / w) at 55°C for 7h to prepare low molecular weight chitosan (80kDa, measured by laser dynamic particle size analyzer)

[0065] Dissolve 6g of low-molecular-weight chitosan in 100mL of distilled water, adjust the pH to 4.5, at room temperature, under nitrogen protection, under the condition of electromagnetic stirring and avoiding light, slowly add 10mL of 0.1mol / L zinc acetate dropwise, precipitation occurs, react for 1h, and statically place, filter, wash and dry to obtain a deep reddish brown product, i.e. chitosan-Zn composite nanoparticles;

[0066] Weigh 25 mg of chitosan-Zn composite nanoparticles and dissolve in 100 mL of 1% acetic acid solution, and adjust the pH of the solution containing chitosan-Zn composite nanoparticles to about 4.6-4.7. Then 0.25 mg / mL sodium tri...

Embodiment 2

[0095] 1) Preparation of chitosan-Zn composite nanoparticle cling film

[0096] 1.1) Preparation of low molecular weight chitosan-Zn composite nanoparticles solution

[0097] The above chitosan was depolymerized by cellulase (3%, w / w) at 55° C. for 7 h to prepare low molecular weight chitosan (80 kDa, measured by a laser dynamic particle size analyzer).

[0098] Dissolve 6g of low-molecular-weight chitosan in 100mL of distilled water, adjust the pH to 4.5, at room temperature, under nitrogen protection, under the condition of electromagnetic stirring and avoiding light, slowly add 10mL of 0.1mol / L zinc acetate dropwise, precipitation occurs, react for 1h, and statically Set, filter, wash and dry dark reddish brown product, that is, low molecular weight chitosan-Zn composite nanoparticles;

[0099] Weigh 25 mg of low molecular weight chitosan-Zn composite nanoparticles and dissolve in 100 mL of 1% acetic acid solution, adjust the pH of the chitosan-Zn composite nanoparticle so...

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Abstract

The invention relates to a preparation method and a purpose of a chitosan-Zn compound nano-particle preservative film. The preservative film comprises chitosan-Zn compound nano-particles and nanocrystal cellulose, wherein the molecular weight of chitosan in the chitosan-Zn compound nano-particles is 50-300kDa. The preparation method for the chitosan-Zn compound nano-particle preservative film comprises the following steps of: 1) through an ionic crosslinking method, preparing a chitosan-Zn compound nano-particle solution; 2) preparing the nanocrystal cellulose; and 3) mixing the chitosan-Zn compound nano-particle solution prepared in S1), the nanocrystal cellulose prepared in S2), a starch solution and glycerol, and preparing a film forming liquid obtained by mixing into the preservative film through a conventional method. The preservative film can be used for food packaging and fruit preservation, and performs a sterilization function to prolong a shelf life.

Description

technical field [0001] The invention relates to a fresh-keeping film material, in particular to a preparation method and application of a chitosan-Zn composite nanoparticle fresh-keeping film. Background technique [0002] Many fruits need to use plastic wrap to keep fresh during the placement process. For example, strawberries have high nutritional value and are known as the "Queen of Fruits" and are deeply loved by consumers. However, strawberries have high water content, delicate tissue and perishable deterioration. At normal temperature, strawberries begin to rot within 1-3 days. Most food packaging materials at home and abroad use polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), urea-formaldehyde plastic (UF), polyvinyl chloride (PVC) and ethylene / vinyl alcohol copolymer (EVOH). Although the above-mentioned materials have high transparency, mechanical properties, surface strength, friction resistance, chemical corrosion resistance and moisture resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/16A23B7/154A23B7/157B65D65/46
CPCA23B7/16A23B7/154A23B7/157B65D65/463A23V2002/00A23V2200/10A23V2250/1614A23V2250/1618A23V2250/1642A23V2250/51084A23V2250/511A23V2250/5118A23V2250/6406Y02W90/10
Inventor 张洪才陈舜胜李若男周丽莎邱婷婷谭啸冯苗苗戴振庭周瑜殷泽生
Owner SHANGHAI OCEAN UNIV
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