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Method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose

A bacterial cellulose, selective technology, applied in fermentation and other directions, can solve the problems of human harm, membrane surface slippage, weak interaction between nanoparticles and bacterial cellulose membrane, etc., to avoid falling off, help stability, and bond firmly Effect

Inactive Publication Date: 2012-02-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for controlled release of metal nanoparticles from biodegradable materials such as paper or plastic by attaching them onto specific parts of these materials through covalently bonded chemical compounds called linkers that hold different atoms together like oxygen (O) -H). These linking agents help prevent particle sinking during use without affecting their effectiveness over time.

Problems solved by technology

Technologies related to this patented technical problem addressed in the patented text include developing novel materials that have specific qualities such as being able to absorb moisture, resist sweat, crush easily without losing their shape over time, provide strong bondings at both surfaces while maintaining low costs compared to existing products made through traditional processes like plasterage. Additionally, these materials may contain various types of fine metallic powders mixed together into one composite, making them ideal candidates for use in medical applications due to improved physiologically compatible characteristics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) the bacterial cellulose produced by Acetobacter xylinum is placed in a freeze dryer and freeze-dried for 24 hours;

[0036] (2) the bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.01mol / L 2,2,5,5-tetramethylpiperidine-N-oxyl and 0.01mol / L horseradish peroxidase, The mass-volume concentration of described bacterial cellulose in described aqueous solution is 2g / L, and with the HNO of 1mol / L 3 The solution adjusts the pH of the above aqueous solution to be 2;

[0037] (3) within 1 hour, gradually add dropwise the hypochlorous acid solution of 1mol / L to make the reaction, the amount added dropwise is one-tenth of the volume of the aqueous solution by volume, and the reaction temperature is 100°C;

[0038] (4) The bacterial cellulose treated in the previous step is taken out, washed 5 times with distilled water, and then washed 5 times with ethanol until its pH value is 7, and the selective oxidation of bacterial cellulose is obt...

Embodiment 2

[0044] (1) Place the bacterial cellulose produced by Acetobacter acetogenes in a lyophilizer and freeze-dry for 24 hours;

[0045] (2) The bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.1mol / L 4-methyl-TEMPO and 0.1mol / L bean hull peroxidase, the quality of the bacterial cellulose in the aqueous solution -volume concentration is 5g / L, and the pH value of above-mentioned aqueous solution is adjusted to be 3 with the HCl solution of 5mol / L;

[0046] (3) Gradually drop the hypochlorite solution of 2mol / L in 2 hours to make the reaction, the dripping amount is one-tenth of the volume of the aqueous solution by volume, and the reaction temperature is 20°C;

[0047] (4) The bacterial cellulose treated in the previous step is taken out, washed 3 times with distilled water, and then washed 3 times with ethanol until its pH value is 6, and the selective oxidation of bacterial cellulose is obtained;

[0048] (5) Add the above-mentioned selectiv...

Embodiment 3

[0053] (1) the bacterial cellulose produced by Acetobacter is placed in a freeze dryer and freeze-dried for 24 hours;

[0054] (2) The bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.51mol / L 4-hydroxyl-TEMPO and 0.5mol / L myeloperoxidase, the mass-volume of described bacterial cellulose in described aqueous solution The concentration is 10g / L, and with 5mol / L HNO 3 The solution adjusts the pH value of the above aqueous solution to 4, and the reaction temperature is 90°C;

[0055] (3) within 3 hours, the chlorous acid solution of 5mol / L was gradually added dropwise to make the reaction, and the amount of addition was one-tenth of the volume of the aqueous solution by volume;

[0056] (4) The bacterial cellulose treated in the previous step is taken out, washed 5 times with distilled water, and then washed 3 times with ethanol until its pH value is 6, and the selective oxidation of bacterial cellulose is obtained;

[0057] (5) The above-...

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Abstract

The invention relates to a method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose, and especially relates to a method for oxidizing a bacteria cellulose C6 site primary hydroxyl to carboxylic acid, aminating and loading the antibacterial nanometer silver. The method comprises the following steps: (1) placing bacteria cellulose which is frozen and dried into a nitroxyl/enzyme system solution, adding an oxidizing agent to react; (2) placing into a diamines substance solution to heat for reacting; (3) then dipping in a silver nitrate solution, generating a chelation by silver ions and amino to obtain the bacteria cellulose containing silver ions loaded by selectivity; or high pressure reducing the bacteria cellulose containing silver ions loaded by selectivity to obtain the bacteria cellulose which selectively loads nanometer silver particles. The method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose is capable of loading the antibacterial nanometer silver on the bacteria cellulose C6 site hydroxyl, so that the combination of the silver ions or nanometer silver particles and bacteria cellulose is firm and difficult to shed.

Description

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Claims

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Application Information

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Owner DONGHUA UNIV
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