Method for preparing nano-silver particles by utilizing burdock root extracting solution, product and application

A technology of nano-silver particles and extracting solution, applied in the field of preparation of nano-materials, can solve problems such as complicated operation process, and achieve the effects of simple preparation process, small average particle size and stable structure

Active Publication Date: 2022-03-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above method needs heating, ultrasonic treatment or light irradiation treatment in the process of synthesizing nano-silver, the operation process is comparatively loaded down with trivial details, and the bacteriostasis effect of the obtained nano-silver needs to be further improved Improve, in addition, the plant species that can be used for synthesizing nano-silver particles disclosed in the prior art is less, for this problem, be badly in need of developing a kind of simple and convenient combination method of the nano-silver particle of excellent bacteriostatic effect

Method used

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  • Method for preparing nano-silver particles by utilizing burdock root extracting solution, product and application
  • Method for preparing nano-silver particles by utilizing burdock root extracting solution, product and application
  • Method for preparing nano-silver particles by utilizing burdock root extracting solution, product and application

Examples

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Effect test

Embodiment 1

[0037] (1) Select fresh burdock root, wash, dry and grind to obtain burdock root powder. The burdock root powder can be stored in a -20°C refrigerator in vacuum; use a stirrer to mix the burdock root powder and deionized water in a mass ratio of 1:150 Stir and mix, the stirring rate power is 100±10W, the stirring time is 1h, and then placed in a centrifuge at 10000rpm for 10min, and the supernatant is taken to obtain a reddish-brown burdock root extract;

[0038] (2) The burdock root extract and 1.25mM AgNO 3After the solution was mixed at a volume ratio of 1:4, it was immediately placed at 25°C and reacted in the dark, and was continuously stirred at 600rpm / min for 2h during the reaction, and the reaction was terminated when the color of the mixed solution changed from reddish brown to dark brown. The mixed solution was centrifuged at 14000 rpm / min for 10 min, and the precipitate was taken, washed twice with deionized water, and then prepared into powder particles by a vacuum...

Embodiment 2

[0040] (1) Select fresh burdock root, wash, dry and grind to obtain burdock root powder, which can be stored in a vacuum at -20°C in a refrigerator; use a stirrer to mix the burdock root powder and deionized water in a mass ratio of 1:120 The ratio is evenly mixed, the stirring rate power is 100±10W, the stirring time is 1.5h, placed in a centrifuge at 10000rpm for 10min, and the supernatant is taken to obtain a reddish-brown burdock root extract;

[0041] (2) The burdock root extract and 1.5mM AgNO 3 After the solution was mixed at a volume ratio of 1:3, it was immediately placed at 25°C and reacted in the dark, and the reaction was continuously stirred at 800rpm / min for 2h, and the reaction was terminated when the color of the mixed solution changed from reddish brown to dark brown. The mixed solution was centrifuged at 14000 rpm / min for 10 min, and the precipitate was taken, washed twice with deionized water, and then prepared into powder particles by a vacuum freeze-drying...

Embodiment 3

[0043] (1) Select fresh burdock root, wash, dry and grind to obtain burdock root powder. The burdock root powder can be stored in a refrigerator at -20°C in vacuum; use a stirrer to mix the burdock root powder and deionized water in a mass ratio of 1:100 The ratio is evenly mixed, the stirring rate power is 100±10W, and the stirring time is 2h, then placed in a centrifuge at 10000rpm for 10min, and the supernatant is taken to obtain a reddish-brown burdock root extract;

[0044] (2) The burdock root extract and 2mM AgNO 3 After the solution was mixed at a volume ratio of 1:6, it was immediately placed at 25°C and reacted in the dark, and was continuously stirred at 700rpm / min for 3h during the reaction, and the reaction was terminated when the color of the mixed solution changed from reddish brown to dark brown. The mixed solution was centrifuged at 14000 rpm / min for 10 min, and the precipitate was taken, washed twice with deionized water, and then prepared into powder particl...

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Abstract

The invention discloses a method for preparing nano-silver particles by using a burdock root extracting solution, which comprises the following steps: (1) cleaning burdock roots, drying, grinding to obtain burdock root powder, uniformly stirring and mixing the burdock root powder with deionized water, and centrifuging to obtain the burdock root extracting solution; and (2) mixing the burdock root extracting solution obtained in the step (1) with an AgNO3 solution, reacting in a dark place at 20-30 DEG C to obtain a mixed solution, and centrifuging, washing and vacuum freeze-drying the mixed solution to obtain the nano-silver particles. The method has the advantages of simple process, less energy consumption, easily available raw materials, no need of additional addition of a reducing agent and a catalyst, no need of illumination, ultrasound, heating and other operations, and suitableness for large-scale production, and the prepared nano-silver particles have stable structure, small average particle size of 5-50nm, high inhibition rate on biofilm formation and motility of rice bacterial blight pathogenic bacteria, and good application prospects. The bactericidal composition has excellent prevention and treatment effects on rice bacterial blight.

Description

technical field [0001] The invention relates to the field of preparation of nanometer materials, in particular to a method, product and application for preparing nanometer silver particles by using burdock root extract. Background technique [0002] Rice bacterial blight is a common rice disease caused by the pathogenic bacteria of rice bacterial blight, and it is easy to spread, causing huge economic losses to my country's agricultural production, while traditional chemical pesticides are likely to cause environmental pollution and cause pathogenic bacteria to develop resistance. medicinal properties and potential harm to the human body, therefore, there is an urgent need to develop an economical, efficient, safe and environmentally friendly product to prevent and treat bacterial blight of rice. [0003] Silver nanoparticles (AgNPs) are now widely used in food packaging, environmental biology, and medical industries. In agriculture, nano silver has powerful insecticidal, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/054A01N59/16A01P1/00B82Y40/00
CPCB22F9/24A01N59/16B82Y40/00Y02A50/30
Inventor 李斌田野罗金燕王惠陈磊刘梦菊张牧晨
Owner ZHEJIANG UNIV
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