A kind of preparation method of temperature/ph dual response nanometer antibacterial system

A double-response, nanotechnology, applied in the direction of botany equipment and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of weak lifting effect and prolong shelf life, so as to prolong shelf life, suppress Enhanced bacterial effect and large operating space

Active Publication Date: 2021-12-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This film uses low-density polyethylene as the base material to functionalize it, and uses slow-release technology to reduce the addition of antioxidants, and at the same time achieves the purpose of extending the shelf life. The improvement effect of shelf life is weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1, preparation of nano silicon spheres:

[0041]a. Dissolve a certain amount of cetyltrimethylammonium bromide in a mixed solution of a certain amount of distilled water and isopropanol to obtain solution A. Cetyltrimethylammonium bromide accounts for the total mass of the three 0.9%, the volume ratio of distilled water and isopropanol is 9:10;

[0042] b. Add ammoniacal liquor with a mass fraction of 28% to the above-mentioned A solution to obtain a B solution. In terms of volume fraction, 0.75 parts of ammonia and 100 parts of A solution;

[0043] c. Add a certain amount of tetraethyl orthosilicate and B solution at a speed of 800r / min, and stir for 24 hours at a speed of 300r / min in a water bath at 40°C. In terms of volume fraction, 3 parts of tetraethyl orthosilicate, 100 parts of solution B;

[0044] d. Centrifuge the silicon spheres obtained in step d at 3000r / min for 30min, wash 3 times with isopropanol and deionized water and centrifuge, filter the centri...

Embodiment 2

[0062] Step 1, preparation of nano silicon spheres:

[0063] a. Dissolve a certain amount of cetyltrimethylammonium bromide in a mixed solution of a certain amount of distilled water and isopropanol to obtain solution A, in which cetyltrimethylammonium bromide accounts for three 0.8% of the total mass, the volume ratio of distilled water and isopropanol is 9:10;

[0064] b. In the above-mentioned solution A, add ammonia water with a mass fraction of 28% to obtain solution B. In parts by volume, 0.7 parts of ammonia water and 100 parts of A solution;

[0065] c. Add a certain amount of tetraethyl orthosilicate and solution B at a speed of 800r / min, and stir for 24 hours at a speed of 300r / min in a water bath at 40°C. In parts by volume, 3 parts of tetraethyl orthosilicate , 100 parts of B solution;

[0066] d. Centrifuge the silicon spheres obtained in step c at 3000r / min for 30min, wash 3 times with isopropanol and deionized water and centrifuge, filter the centrifuged produ...

Embodiment 3

[0084] Step 1, preparation of nano silicon spheres:

[0085] a. Dissolve a certain amount of cetyltrimethylammonium bromide in a mixed solution of a certain amount of distilled water and isopropanol to obtain solution A. Cetyltrimethylammonium bromide accounts for the total mass of the three 0.9% of distilled water and isopropanol volume ratio is 9:10;

[0086] b. Adding mass fraction of 28% ammonia water to the above-mentioned A solution to obtain the B solution, in parts by volume, 0.75 parts of ammonia water and 100 parts of A solution;

[0087] c. Add a certain amount of tetraethyl orthosilicate and solution B at a speed of 800r / min, and stir for 24 hours at a speed of 300r / min in a water bath at 40°C. In parts by volume, 3.2 parts of tetraethyl orthosilicate , 100 parts of B solution;

[0088] d. Centrifuge the silicon spheres obtained at 3000r / min for 30min, wash them with isopropanol and deionized water three times and centrifuge them, then filter the centrifuged prod...

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Abstract

The invention belongs to the technical field of medicine and food packaging materials, and in particular relates to a preparation method of a temperature / pH double-response nanometer antibacterial system. The preparation method of the present invention includes preparation of nano silicon spheres, surface treatment of nano silicon spheres, preparation of hollow mesoporous silicon spheres, antibacterial agent loading and temperature / pH stimulus responsive outer material coating. The nano antibacterial system of the present invention is a temperature / pH dual stimulus responsive material, which has good temperature and pH sensitivity. It adopts the preparation sequence of preparing nano silicon spheres first, then surface treatment, and then preparing hollow mesoporous silicon. Compared with direct The preparation sequence of synthesizing mesoporous silicon and then surface treatment ensures that the surface grafts are only grafted on the non-mesoporous part of mesoporous silicon, while the mesoporous part retains the properties of nano-silicon, which can increase the resistance of the antibacterial system to antibacterial agents. carrying capacity.

Description

technical field [0001] The invention belongs to the technical field of medicine and food packaging materials, and in particular relates to a preparation method of a temperature / pH dual-response nanometer antibacterial system. Background technique [0002] Antibacterial packaging belongs to active packaging. Active packaging technology often uses active factors to actively change the environment of the packaged goods in the package, so as to achieve the purpose of extending the shelf life of the product. Active factors such as antibacterial agents, antioxidants and enzymes diffuse to the surface of food that is most prone to spoilage reactions, inhibit the growth of microorganisms on the food surface or prevent food spoilage due to oxidation, so as to maintain the quality of food and extend the shelf life. The release rate of active factors often needs to be controlled, so the existing technology uses inorganic nano-carriers, organic polymer carriers, packaging materials, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/08A01N37/40A01N63/20A01P1/00A01P3/00B82Y30/00B82Y40/00
CPCA01N25/08A01N37/40B82Y30/00B82Y40/00A01N63/10
Inventor 丘晓琳唐有凯张景萍林茜池张衡伟
Owner JIANGNAN UNIV
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