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Chitosan plant essential oil microcapsule composite coating preservative as well as preparation method and application thereof

A technology of coating preservatives and plant essential oils, which is applied in the fields of application, preservation of fruits and vegetables, and protection of fruits/vegetables with a coating protective layer. It can solve the problems of short storage time, stratification of phases, safety pollution of chemical preservatives, etc. problems, to achieve the effect of simple treatment, mild reaction conditions, and prolonging the fresh-keeping effect

Active Publication Date: 2022-07-29
SOUTH SUBTROPICAL CROPS RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies in the prior art, the present invention provides a composite coating film preservative and its preparation method and application, which solves the problem of the existing coating film preservative in storage. During the process, the problems of phase delamination, oxidative deactivation, and short storage time are prone to occur; at the same time, it also solves the problem of single function of the current microcapsule carrier material, the safety of conventional chemical preservatives, and the problem of polluting the environment

Method used

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  • Chitosan plant essential oil microcapsule composite coating preservative as well as preparation method and application thereof
  • Chitosan plant essential oil microcapsule composite coating preservative as well as preparation method and application thereof
  • Chitosan plant essential oil microcapsule composite coating preservative as well as preparation method and application thereof

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preparation example Construction

[0045] 2. The present invention discloses a preparation method of the above-mentioned chitosan-polyphenol derivative, comprising the following steps:

[0046] (1) Dissolve carboxymethyl chitosan in deionized water to form a carboxymethyl chitosan solution, add a phase transfer catalyst, stir and mix with epoxy vegetable oil and photocatalyst dissolved in an organic solvent under UV light , dialysis, freeze-drying to obtain UV photocatalyzed carboxymethyl chitosan vegetable oil-based copolymer;

[0047] Among them, the viscosity average molecular weight of carboxymethyl chitosan is 3.0×10 3 ~2.5×10 5 , the degree of deacetylation is greater than or equal to 90%, the degree of carboxylation is greater than or equal to 80%, and the concentration of the carboxymethyl chitosan solution is 1.0-10.0 mg / mL. The mass ratio of the phase transfer catalyst to carboxymethyl chitosan is 1:5 to 1:20, the mass ratio of epoxy vegetable oil to carboxymethyl chitosan is 1:1 to 5:1, and the epo...

Embodiment 1

[0073] (1) Set the viscosity average molecular weight to 3.0×10 3 , 1.0 g of carboxymethyl chitosan with a degree of deacetylation of 90% and carboxymethylation of 80% was dissolved in 100 mL of deionized water, and 0.2 g of tetrabutylammonium bromide (TBAB) was added as a phase transfer catalyst, mixed evenly. Then, 1.0 g of epoxidized soybean oil with an epoxy value of 6.6 was dissolved in 10 mL of acetone, and 0.1 g of a cationic photoinitiator triarylsulfonium salt was added. The above solution was stirred and mixed evenly, placed under 1000W UV light, and reacted with magnetic stirring at a speed of 1000r / min for 1h, dialyzed in a 5% ethanol aqueous solution for 48h (the molecular weight of the dialysis bag was 2000), freeze-dried for 24h, That is, the carboxymethyl chitosan epoxy soybean oil-based copolymer is obtained.

[0074] (2) 0.322 g of carboxymethyl chitosan epoxidized soybean oil-based copolymer and 0.161 g of 1-hydroxybenzotriazole (HOBt) were stirred in 100 ...

Embodiment 2

[0081] (1) Set the viscosity average molecular weight to 2.5×10 5 , 0.8 g of carboxymethyl chitosan with a degree of deacetylation of 90% and carboxymethylation of 85% was dissolved in 100 mL of deionized water, and 0.04 g of benzyltriethylammonium chloride (TEBA) was added as a phase transfer catalyst ,well mixed. Then, 1.0 g of epoxidized tung oil with an epoxy value of 5.8 was dissolved in 10 mL of acetone, and 0.036 g of acidic ionic liquid N-(4-sulfonic acid)butyltrimethylamine hydrogen sulfate was added. The above solution was stirred and mixed evenly, placed under 100W UV light, and reacted with magnetic stirring at a speed of 1000r / min for 5h, dialyzed in an aqueous solution of 5% ethanol for 24h (the molecular weight of the dialysis bag was 15000), freeze-dried for 48h, That is, the carboxymethyl chitosan epoxy tung oil-based copolymer is obtained.

[0082] (2) Mix 0.322g carboxymethyl chitosan epoxy tung oil-based copolymer with 1.610g benzotriazole-N,N,N',N'-tetra...

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Abstract

The invention relates to the technical field of fruit and vegetable preservation, in particular to a chitosan plant essential oil microcapsule composite coating preservative as well as a preparation method and application thereof. The specific technical scheme is as follows: the composite coating preservative comprises the following components in parts by mass: 1-10 parts of a film forming substance, 50-70 parts of a dispersing agent, 0.1-10 parts of chitosan-polyphenol / plant essential oil microcapsules, 1-5 parts of a plasticizer, 0-10 parts of nano reinforced particles and 0.5-5 parts of a binder. According to the invention, the problems of easy boundary phase layering, oxidation inactivation and short storage time in the storage process of the existing coating preservative are solved.

Description

technical field [0001] The invention relates to the technical field of preservation of fruits and vegetables, in particular to a chitosan plant essential oil microcapsule composite coating preservative and a preparation method and application thereof. Background technique [0002] With the increasing demand for green, organic, healthy and safe food, the research on food packaging materials has also entered a new stage, and new packaging products and materials with green and sustainable development have become the focus of scholars' research. Edible packaging film is made of natural edible substances (such as chitosan, starch, gelatin, etc.) as raw materials, and is a film with a porous network structure formed through the interaction of different molecules, which can be used to isolate microorganisms and foreign pollutants. Enter, prevent food spoilage, and have a certain fresh-keeping effect. Chitosan, plant polyphenols, and plant essential oils, as natural antibacterial a...

Claims

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Application Information

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IPC IPC(8): A23B7/16A23B7/154A23B7/157
CPCA23B7/16A23B7/154A23B7/157A23V2002/00A23V2200/02A23V2200/10A23V2300/48A23V2250/511A23V2250/5118A23V2250/2132A23V2250/5036A23V2250/5482A23V2250/51088A23V2250/5112Y02W90/10
Inventor 周闯李普旺杨子明屈云慧于丽娟何祖宇王超刘运浩宋书会
Owner SOUTH SUBTROPICAL CROPS RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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