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Antibacterial composite film containing PEC, KGM and nano TiO2 and preparation method thereof

A composite membrane and nanotechnology, applied in the field of composite membranes, can solve problems such as spoilage of fruits and vegetables, meat, etc., and achieve the effects of delaying spoilage, inhibiting the growth of microorganisms, and high water vapor transmission rate.

Pending Publication Date: 2022-04-29
JIAYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the surface of the packaging film for packaging nutritious items such as fruits and vegetables and meat is rich in nutrients, and its storage temperature and humidity are also more suitable for the growth of microorganisms. The microorganisms contaminated on the surface of the packaging film can easily migrate to fruits, vegetables and meat, causing , meat accelerated spoilage

Method used

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  • Antibacterial composite film containing PEC, KGM and nano TiO2 and preparation method thereof
  • Antibacterial composite film containing PEC, KGM and nano TiO2 and preparation method thereof
  • Antibacterial composite film containing PEC, KGM and nano TiO2 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 2

[0086] A single factor test was used to detect the effect of titanium dioxide addition on various properties of the film. The testing items are still the testing of tensile strength, water vapor transmission coefficient and oil transmission coefficient.

[0087] Nano-titanium dioxide decomposes bacteria under the action of photocatalysis to achieve antibacterial effect. Since the electronic structure of nano-titanium dioxide is characterized by a full TiO 2 The valence band and an empty conduction band, in the water and air system, nano-titanium dioxide is exposed to sunlight, especially ultraviolet rays, when the electron energy reaches or exceeds its band gap energy. The electrons can be excited from the valence band to the conduction band, and at the same time, corresponding holes are generated in the valence band, that is, electron-hole pairs are generated. Under the action of the electric field, the electrons and holes are separated and migrate to different positions on ...

experiment example 3

[0107] A single factor test was used to detect the antibacterial performance of the film by the amount of titanium dioxide added.

[0108] Detection method

[0109] 1. Experiment Escherichia coli was used as the test strain. A certain amount of composite film was crushed into fragments and added to the E. coli suspension. After culturing for 24 hours, the colony group experiment was carried out, and the number of colony groups was counted.

[0110] 2. In the experiment, Escherichia coli was used as the test strain to prepare LB medium. When smearing the bacteria solution, the 2 The membrane was punched into thin slices with a diameter of 2 cm, placed in a petri dish coated with bacterial solution, and observed after 24 hours in an incubator.

[0111] The experimental results are shown in Table 1:

[0112] Table 1: The test results of the addition of titanium dioxide on the antibacterial performance of the film

[0113]

[0114]

[0115] Experimental results such as ...

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Abstract

The invention relates to the technical field of composite membranes, in particular to an antibacterial composite membrane containing PEC, KGM and nano TiO2 and a preparation method thereof.The antibacterial composite membrane containing PEC, KGM and nano TiO2 is prepared from, by weight, 0.6%-1% of pectin (PEC), 0.5%-1.0% of konjac glucomannan (KGM), 0.5%-0.7% of glycerin, 0.5%-4.5% of nano TiO2 and the balance distilled water; the antibacterial composite film disclosed by the invention has excellent tensile property, high water vapor permeability and low oil permeability coefficient, and can promote the diffusion of moisture in fresh meat, reduce the moisture content of the meat and delay the decay of the meat; the loss of flavor substances can be reduced, the loss of fat can be blocked, and the flavor of fresh meat is kept; after the nano TiO2 is added into the antibacterial composite film, the mechanical property, the antibacterial activity, the barrier property and the like of the antibacterial composite film are obviously improved; the nano TiO2 can inhibit the breeding of microorganisms on the surface of food, can effectively make up the performance defects of the PEC / KGM composite film, and can enhance the antibacterial effect and mechanical properties of the PEC / KGM composite film.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a composite film containing PEC, KGM, nano-TiO 2 Antibacterial composite film and preparation method thereof. Background technique [0002] Konjac glucomannan (KGM) is a non-ionic water-soluble polymer polysaccharide isolated and extracted from the natural plant konjac ball. It has good thickening, gelling, cohesiveness and water absorption. The food box food additive industry has a wide range of applications. Its hydrosol can form a film under appropriate conditions and become a green edible packaging film. It has broad prospects, but the film prepared by pure konjac glucomannan has poor mechanical properties and low strength. , Poor water resistance, can not be used for food packaging. Pectin (PEC) is a linear flexible polymer, and its linear structure can endow the film with soft and tough characteristics. The pectin film has antibacterial and degradable properti...

Claims

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Application Information

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IPC IPC(8): C08L5/06C08L5/00C08K3/22C08J5/18
CPCC08J5/18C08J2305/06C08J2405/00C08J2305/00C08J2405/06C08K2003/2241C08K2201/011
Inventor 王楠范丽萍陈熠崔伟怡黄舒琦李慧玲
Owner JIAYING UNIV
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