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

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...

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 combine with protease, so that the bacterial cells cannot metabolize, divide and reproduce, until they die

[0004] The preparation methods of nano-silver have always been based on physical and chemical methods, but they have high production costs, are easy to pollute the environment, and are easy to leave some harmful ingredients in the product.

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