Preservative film with intelligent microorganism self-inhibition effect and preparation method of preservative film

An inhibitory, microbial technology, used in biochemical fiber processing, filament/thread forming, single-component polyester rayon, etc. Good capacitance and enhanced antibacterial effect

Active Publication Date: 2021-12-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, although these carriers can prevent the rapid release of cinnamon essential oil and prolong the shelf life of food, they still cannot achieve the purpose of controlled release in the packaging environment, so the stimulus-response controlled release system, especially the use of substances produced by bacteria themselves to stimulate antibacterial Agent release to achieve the purpose of antibacterial preservation, which has great research value and significance in the field of food packaging

Method used

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  • Preservative film with intelligent microorganism self-inhibition effect and preparation method of preservative film
  • Preservative film with intelligent microorganism self-inhibition effect and preparation method of preservative film
  • Preservative film with intelligent microorganism self-inhibition effect and preparation method of preservative film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a preservative film with microbial intelligence self-inhibition, the specific steps are:

[0036] (1) Dissolve 1.0g of polylactic acid particles in 10mL of dichloromethane (DCM) to obtain a 10% polylactic acid spinning solution, adjust the ambient humidity to 20%, 50%, and 80%, and inject the solution into a 20mL syringe, The electrospinning voltage is 25kV, the flow rate is 1.0mL / h, and the receiving distance is 15cm. The porous PLA nanofibers, that is, the porous polylactic acid nanofibers, are prepared. The morphology of the fibers is observed according to the scanning electron microscope. When the humidity of the electrospinning environment is 80 %, the porosity of the fiber is the highest, the pores are more uniform, and the fiber morphology is as Figure 1a shown.

[0037] (2) Soak the porous polylactic acid nanofiber membrane in 50% ethanol aqueous solution in advance to remove impurities on the surface of the fiber membrane, and then soak...

Embodiment 2

[0042] A preparation method of a preservative film with microbial intelligence self-inhibition, the specific steps are:

[0043] (1) Dissolve 1.0g polylactic acid particles in 10mL dichloromethane to obtain 10% polylactic acid spinning solution, adjust the ambient humidity to 80%, inject the solution into a 20mL syringe, and the electrospinning voltage is 25kV, and the flow rate is 1.0 mL / h, the receiving distance is 15cm, and the porous polylactic acid nanofibers are prepared.

[0044] (2) Soak the porous polylactic acid nanofiber membrane in 50% ethanol aqueous solution in advance to remove impurities on the surface of the fiber membrane, and then soak it in 0.2M NaOH solution for 10min, 20min, 30min, 40min, 50min, 60min, 70min, 80min ,90min (50℃), when the treatment time is 60min with NaOH, the fiber still maintains the complete morphology, when the treatment time exceeds 60min, the fiber morphology is damaged.

[0045] (3) Activate the NaOH-treated nanofibers in the EDC / N...

Embodiment 3

[0049] A preparation method of a preservative film with microbial intelligence self-inhibition, the specific steps are:

[0050] (1) Dissolve 1.0g polylactic acid particles in 10mL dichloromethane (DCM) to obtain 10% polylactic acid spinning solution, adjust the ambient humidity to 80%, inject the solution into a 20mL syringe, and the electrospinning voltage is 25kV, The flow rate was 1.0mL / h, and the receiving distance was 15cm, and porous PLA nanofibers were prepared.

[0051] (2) Soak the porous polylactic acid nanofiber membrane in 50% ethanol aqueous solution in advance to remove impurities on the surface of the fiber membrane, and then soak in 0.2M NaOH solution for 60min (50°C).

[0052] (3) Activate the NaOH-treated nanofibers in the EDC / NHS mixed solution. In the EDC / NHS mixed solution, the concentration of EDC is 6 mg / mL, and the concentration of NHS is 4 mg / mL. Stir slowly at room temperature for 12 hours, wash with water for 3 times to remove unreacted EDC / NHS. S...

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Abstract

The invention belongs to the field of antibacterial food packaging, and particularly relates to a preservative film with an intelligent microorganism self-inhibition effect and a preparation method of the preservative film. Porous polylactic acid nanofibers are modified with polyethyleneimine to obtain positively charged polyethyleneimine modified porous polylactic acid nanofibers, cinnamon essential oil is loaded through a physical adsorption method, then a pectin coating is assembled through electrostatic interaction, and the microorganism self-inhibition preservative packaging film capable of releasing the cinnamon essential oil through specific stimulation response of pectinase is obtained. According to the preservative film provided by the invention, the pectinase generated by microorganisms, especially fungi, can be used as a stimulation response factor, and the purpose of controlling release of the antibacterial cinnamon essential oil is achieved by controlling the speed of decomposing a plugging pectin coating by the pectinase.

Description

technical field [0001] The invention belongs to the field of antibacterial food packaging, and in particular relates to a fresh-keeping film with microbial intelligent self-inhibiting effect and a preparation method thereof. Background technique [0002] Antibacterial packaging is of great significance to effectively prevent food from spoiling. At present, most antimicrobial active packaging directly adds or directly loads antibacterial agents into packaging materials to inhibit the growth of microorganisms and prolong the shelf life of food. Antibacterial agents currently used in food packaging are mainly divided into synthetic antibacterial agents and natural antibacterial agents. Synthetic antibacterial agents mainly include Ag, ZnO, quaternary ammonium salts, etc., but these synthetic antibacterial agents often have disadvantages such as high toxicity or high cost, and adding them to packaging materials also has potential hazards to human health. Natural antibacterial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M11/38D06M15/03D06M13/127D01F6/62D01D5/00D04H1/728D06M101/32
CPCD06M15/61D06M11/38D06M15/03D06M13/127D06M16/00D01F6/62D01D5/003D04H1/728D06M2101/32Y02W90/10
Inventor 温永强闵甜甜周莉平
Owner UNIV OF SCI & TECH BEIJING
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