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Preparation method for nano silver chitosan composite microsphere

A technology of composite microspheres and nano-silver, which is applied in the field of antibacterial, can solve the problems of high surface energy and unstable properties of nano-silver particles, and achieve the effects of simple operation, extended shelf life, and reduced pollution

Pending Publication Date: 2019-11-12
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface energy of nano-silver particles is high and their properties are very unstable, so it is necessary to modify the surface of nano-silver particles to make them more widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of nano silver

[0024] Dissolve 1.699g of silver nitrate in 10ml of deionized water to obtain a 1M silver nitrate solution, dissolve 3.6g of glucose, 0.56g of sodium hydroxide, and 2.4g of polyvinylpyrrolidone in 20ml of deionized water to prepare a reducing solution; The solution was slowly added dropwise to the reduction solution and stirred vigorously at 60°C. After the dropwise addition was completed, continue to stir for 10 minutes to obtain a beige sol. The sol was centrifuged at 3000r / min, and the solid was washed with deionized water and ethanol. After three times, dry in a 50 degree oven for 24 hours to obtain dark brown solid silver nanoparticles.

[0025] (2) Preparation of nano-silver antibacterial solution

[0026] Dissolve 0.3g of chitosan in 30mL of 3% (v / v) acetic acid solution, stir magnetically at room temperature to dissolve it completely, take 0.1g of nano-silver particles, add them to the chitosan solution while stirring, and stir ...

Embodiment 2

[0030] (1) Preparation of nano-silver: the nano-silver particles prepared in Example 1 were used.

[0031] (2) Preparation of nano-silver antibacterial solution

[0032] Dissolve 0.3g of chitosan in 30mL of 3% (v / v) acetic acid solution, stir magnetically at room temperature to dissolve it completely, take 0.2g of nano-silver particles, add them to the chitosan solution while stirring, and stir after ultrasonic Obtain dark brown nano-silver antibacterial solution.

[0033] (3) Preparation of nano-silver-chitosan composite microspheres: the nano-silver-chitosan composite microspheres prepared in Example 1 were used.

Embodiment 3

[0035] (1) Preparation of nano-silver: the nano-silver particles prepared in Example 1 were used.

[0036] (2) Preparation of nano-silver antibacterial solution

[0037] Dissolve 0.3g of chitosan in 30mL of 3% (v / v) acetic acid solution, stir magnetically at room temperature to dissolve it completely, take 0.3g of nano-silver particles, add them to the chitosan solution while stirring, and stir after ultrasonic Obtain dark brown nano-silver antibacterial solution.

[0038] (3) Preparation of nano-silver-chitosan composite microspheres: the nano-silver-chitosan composite microspheres prepared in Example 1 were used.

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Abstract

The invention discloses a preparation method for a nano silver chitosan composite microsphere. The preparation of the composite microsphere includes the following steps: (1) preparing silver nitrate into a 1 M of a solution, preparing glucose, polyvinylpyrrolidone and sodium hydroxide into a reducing solution, adding the silver nitrate solution into the reducing solution to perform centrifugation,washing and drying to obtain nano silver particles; (2) adding glacial acetic acid into 1-2 wt% of a chitosan aqueous solution to obtain a chitosan acetic acid solution, weighing the nano silver intothe chitosan acetic acid solution, and obtaining a nano silver antibacterial solution after stirring and ultrasound; and (3) putting the nano silver antibacterial solution into a water bath kettle with 60 DEG C, adding diluted glutaraldehyde to stir, and performing centrifugation, washing and drying after reaction is finished so that the nano silver chitosan composite microsphere can be obtained.The nano silver chitosan composite microsphere is strong in performance and adsorbability and friendly in environment, so that pollution cannot be easily caused, and the nano silver chitosan composite microsphere can be applied to fields of antibiosis and the fresh-keeping of fruits, so that the nano silver chitosan composite microsphere is an excellent edible whole natural fruit fresh-keeping agent.

Description

technical field [0001] The invention belongs to the field of antibacterial technology, and in particular relates to a preparation method of nano-silver chitosan composite microspheres. Background technique [0002] Silver metal has a good broad-spectrum antibacterial effect and is widely used in medicine, optics, catalysis, and biological sciences. Nano-silver particles have many special properties due to their unique size. And with the continuous improvement of nanotechnology, nano-silver can be found in the field of textiles, medical and health care, and fruit fresh-keeping packaging in the food industry. However, the surface energy of nano-silver particles is high and their properties are very unstable. Therefore, it is necessary to modify the surface of nano-silver particles to make them more widely used. Combining nano-silver particles with polymers, the resulting composite material combines the unique properties of nano-silver with polymer materials, which can endow ...

Claims

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Application Information

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IPC IPC(8): A23B7/16A23L3/3562A23L3/358A23L3/3508
CPCA23B7/16A23L3/3562A23L3/358A23L3/3508A23V2002/00A23V2200/10A23V2250/1562A23V2250/511A23V2300/10A23V2300/20Y02A40/90
Inventor 梁俊王静
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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