Method for preparing nano silver particles by using plant extract for reduction, and application of method

A plant extract and nano-silver particle technology is applied in the field of preparing nano-silver particles by reduction of plant extract, which can solve the problems that bacterial cells cannot metabolize, divide and reproduce, easily pollute the environment, and have high production costs, and achieve low cost of raw materials, environmental friendliness, and high production cost. The effect of enhanced bactericidal properties

Inactive Publication Date: 2011-11-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The antibacterial principle of nano-silver is mainly that nano-sized silver particles can release positively charged silver ions. When silver ions contact negatively charged bacterial cells, due to the specific combination of silver ions and proteins (-SH), Puncture the cell wall and the outer surface of the cell membrane, and comb

Method used

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  • Method for preparing nano silver particles by using plant extract for reduction, and application of method
  • Method for preparing nano silver particles by using plant extract for reduction, and application of method
  • Method for preparing nano silver particles by using plant extract for reduction, and application of method

Examples

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Embodiment 1

[0025] After the dried chrysanthemum is pulverized, weigh 0.5g of chrysanthemum dry powder, add 50mL of distilled water, heat it in a 1000mL beaker and filter it. The resulting plant extract was added dropwise to 100 mL of AgNO 3 React in the solution, silver nitrate final concentration is 0.1mM, obtain nano-silver particle after reacting 5h, observe gained nano-silver solution with ZETA potential particle size meter and transmission electron microscope (TEM), wherein the morphology of nano-silver particle is nearly spherical, Most of the particle sizes are distributed between 20 and 80nm, with an average particle size of 30.8nm.

Embodiment 2

[0027] Weigh 100g of dried chrysanthemum powder after crushing dried chrysanthemum, add 900mL of distilled water and 100mL of ethanol, heat in a 2000mL beaker and filter. The resulting plant extract was added dropwise to 200 mL of AgNO 3 React in the solution, silver nitrate final concentration is 10mM, obtain nano-silver particle after reacting 120h, observe gained nano-silver solution with ZETA potential particle size meter and transmission electron microscope (TEM), wherein the shape of nano-silver particle is nearly spherical, particle Most of the diameters are distributed between 20 and 80nm, and the average particle diameter is 25.8nm.

Embodiment 3

[0029] Weigh 50g of dried chrysanthemum powder after crushing the dried chrysanthemum, add 250mL of distilled water, heat in a 1000mL beaker and filter. The resulting plant extract was added dropwise to 300 mL of AgNO 3 React in the solution, silver nitrate final concentration is 10mM, obtain nano-silver particle after reacting 2h, observe gained nano-silver solution with ZETA potential particle size meter and transmission electron microscope (TEM), wherein the appearance of nano-silver particle is nearly spherical, particle Most of the diameters are distributed between 20 and 80nm, and the average particle diameter is 32.8nm.

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Abstract

The invention discloses a method for preparing nano silver particles by using plant extract for reduction, and application of the method. In the method, the extract of natural plants such as chrysanthemum, honeysuckle flower, or bud of Japanese pagoda tree which serves as a reducing agent reacts with Ag<+> in aqueous solution of silver nitrate to ensure that Ag<+> is reduced into elementary substance silver nano particles. The method is simple, reaction conditions are mild, additives except for silver nitrate are not needed, the plant extract which is low in cost and can be easily obtained is used as the reducing agent, and the method is environment-friendly; the nano silver particles obtained by the method have smaller diameters, and high dispersibility and stability in aqueous solution; and Chinese herbal medicine components which have the effects of antibiosis and antiphlogosis are added, and the method has the characteristics of disinfection and sterilization, bacteriostasis, safety, no toxicity or irritation and the like and can be directly applied to multiple kinds of dermatological and surgical bacterial infection or medical equipment and cosmetics.

Description

technical field [0001] The invention relates to a nano-silver particle, in particular to a method for preparing a nano-silver particle by reducing a plant extract and its application. Background technique [0002] The bactericidal properties of silver have been discovered as early as 1938, when people put silver coins in milk, which can prolong the storage time of milk in the air. The Food and Drug Administration (FDA) of the U.S. pointed out in a document published on September 13, 1991 that nano silver has a stronger bactericidal effect than the common silver particles used before. Metal silver itself has the functions of bactericidal and antibacterial, preventing wound ulceration and accelerating wound healing. After nanotechnology, its specific surface area increases sharply, and its bactericidal ability can be increased by about 300 times. Some bactericidal and antibacterial ability. At present, the development and application of nano-silver related products on the ma...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00A01N59/16A01P1/00A61K33/38A61K8/19A61P31/02A61P31/04
Inventor 杜志云汤志恺张焜赵丰华方岩雄莫容清薛贵华周洪文王凤李国强曾婉玲
Owner GUANGDONG UNIV OF TECH
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