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Nano preservative film with intelligent response and antibacterial functions and preparation method thereof

A nano-preservation film, functional technology, applied in the direction of rayon manufacturing, textile and paper making, single-component polyester rayon, etc., to achieve the effect of extending the validity period, good economic and social benefits, and avoiding losses

Inactive Publication Date: 2019-12-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fibers obtained by blending BSA, PEG, and PCL showed a burst release phenomenon.

Method used

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  • Nano preservative film with intelligent response and antibacterial functions and preparation method thereof
  • Nano preservative film with intelligent response and antibacterial functions and preparation method thereof
  • Nano preservative film with intelligent response and antibacterial functions and preparation method thereof

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preparation example Construction

[0030] Another object of the present invention is to provide a method for preparing the above-mentioned nano cling film. The preparation method includes the following steps:

[0031] S1) Preparation of the shell solution: mixing polylactic acid-glycolic acid copolymer, ethylene-vinyl alcohol copolymer, N,N-dimethylacetamide and ethanol to obtain a uniform solution;

[0032] S2) Prepare the core layer solution: dissolve thymol in absolute ethanol, and stir at room temperature until thymol and absolute ethanol are completely miscible to obtain a uniform solution;

[0033] S3) The solution obtained in S1) and the solution obtained in S2) are used to prepare an ultrafine fiber membrane with a core-shell double-layer structure, that is, a nano cling film by coaxial electrospinning technology.

[0034] Further, the volume ratio of N,N-dimethylacetamide to ethanol in S1) is 1:1 to 1:6.

[0035] Further, the ratio of polylactic acid-glycolic acid copolymer and ethanol in said S1) is 1:1-1:3.

[...

Embodiment 1

[0041] The electronic balance weighed 3g EVOH (32% ethylene content) into 27g DMAc, and magnetically stirred at 90°C until the solution was completely dissolved to obtain a 10% mass fraction shell solution.

[0042] Place the reagent bottle containing the above-mentioned shell solution in an ultrasonic cleaner and ultrasonic for half an hour, in order to remove bubbles in the electrostatic spinning solution.

[0043] Weigh 5g of thymol on an electronic balance, add it to the already weighed 5g of ethanol, and place it in a shaker to shake well until the thymol is completely dissolved in the ethanol to obtain a 50% thymol solution, which is used as Core layer solution for coaxial electrospinning.

[0044] Carry out coaxial electrospinning, the voltage applied by the high-voltage power supply is 14kV, the flow rate of the shell solution is 0.8ml / h, the flow rate of the core solution is 0.3ml / h, the distance between the needle and the receiving plate is 18cm, and the nanofibers obtained...

Embodiment 2

[0047] The electronic balance weighed 6g EVOH (36% ethylene content) into 34g DMAc, stirred magnetically at 90°C until the solution was completely dissolved, and a shell solution with a mass fraction of 15% was obtained.

[0048] Place the reagent bottle containing the above-mentioned shell solution in an ultrasonic cleaner and ultrasonic for half an hour, in order to remove bubbles in the electrostatic spinning solution.

[0049] Weigh 8g of thymol on an electronic balance, add it to the already weighed 8g of ethanol, and place it in a shaker to shake well until the thymol is completely dissolved in the ethanol to obtain a 50% thymol solution, which is used as Core layer solution for coaxial electrospinning.

[0050] Conduct coaxial electrospinning, the voltage applied by the high-voltage power supply is 16kV, the flow rate of the shell solution is set to 1.0ml / h, the flow rate of the core solution is set to 0.5ml / h, and the distance between the needle and the receiving plate is 15c...

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Abstract

The invention belongs to the technical field of food preservation, and relates to a nano preservative film with intelligent response and antibacterial functions and a preparation method thereof. The preservative film is prepared from superfine fibers of a core-shell structure, wherein a compound of poly(lactic-co-glycolic acid) and an ethylene-vinyl alcohol copolymer is used as a shell, and thymolis used as a core. The poly(lactic-co-glycolic acid) can serve as a degradable skeleton material, the ethylene-vinyl alcohol copolymer is a material with high barrier properties, and as the shell, the compound of the poly(lactic-co-glycolic acid) and the ethylene-vinyl alcohol copolymer can isolate oxygen in air and also can effectively inhibit volatilization of the thymol. Under the condition ofimproving the humidity, molecular gaps of shell materials are enlarged, the isolation performance of the shell is reduced, and the antibacterial agent, namely the thymol, wrapped in core-shell nano fiber can slowly volatilize into an environment for storing fruits and vegetables. The film is applied to storage of the fruits and the vegetables, and can intelligently and spontaneously realize responsive release of thymol essential oil along with change of the environmental humidity, so that the storage period of the fruits and the vegetables is prolonged.

Description

Technical field [0001] The invention relates to the technical field of food preservation, in particular to a nano-preservation film with intelligent response and antibacterial functions and a preparation method thereof. Background technique [0002] Food packaging is an important part of food. It has the characteristics of protecting food from external biological, chemical and physical factors and maintaining stable food quality. With the strengthening of consumer safety awareness and government supervision, food packaging safety has also been raised to the same level of supervision. In order to meet the requirements of the sustainable development strategy, the development of new, green and safe multifunctional food packaging and materials is the direction of future food packaging development. [0003] The main function of food packaging is to protect the product. Therefore, the packaging design should be safe and protective, and at the same time it should be easy to produce and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4382D01D5/34D01F1/10D01F6/92
CPCD01D5/34D01F1/10D01F1/103D01F6/92D04H1/4382D04H1/728
Inventor 温永强刘蓉朱竹张一博
Owner UNIV OF SCI & TECH BEIJING
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