Plant polyphenol based preparation method of core-shell structural nano-silver antibacterial material

A nano-silver antibacterial, core-shell structure technology, applied in the fields of botanical equipment and methods, chemicals for biological control, plant growth regulators, etc., can solve the problem of hindering the formation of tannic acid-Ag complex structures Core-shell structure, low solid content of nano-silver, etc., achieve the effects of green raw materials, large-scale production, and simple preparation methods.

Inactive Publication Date: 2019-04-26
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although relevant research groups have relevant research reports on the tannic acid-nanometer silver system, for example, the patent document CN106634220A reports a nano-silver conductive ink, in which the nano-silver used is tannic acid-stabilized silver nanoparticles, and the silver ammonia solution As a precursor, tannic acid is used as a reducing agent and a stabilizer for silver nanoparticles at the same time. It is prepared by chemical reduction, but this method needs to prepare silver ammonia solution first, and the prepared nano-silver needs to be purified in absolute ethanol, so that The preparation method adds many processes, and the tannic acid in this document only acts as a reducing agent and does not self-polymerize, so it cannot form a specific core-shell structure
Another example is th

Method used

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  • Plant polyphenol based preparation method of core-shell structural nano-silver antibacterial material
  • Plant polyphenol based preparation method of core-shell structural nano-silver antibacterial material
  • Plant polyphenol based preparation method of core-shell structural nano-silver antibacterial material

Examples

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Embodiment 1

[0036] A method for preparing a core-shell structure nano-silver antibacterial material based on plant polyphenols, specifically adopting the following steps:

[0037] 1) The AgNO 3 Dissolve in phosphate buffer at pH=7, then dissolve tannic acid in ultrapure water;

[0038] 2) Add the tannic acid solution obtained in step 1) dropwise to the AgNO obtained in step 1) 3 solution, at a room temperature of 25°C, oscillate with a mechanical oscillator for 20 minutes, centrifuge the reaction solution, collect the precipitate and dissolve it in ultrapure water to obtain the product, wherein the tannic acid and AgNO 3 The mass ratio of is 1:10, and the concentration of the phosphate buffer is 2mM.

[0039] 3) Centrifuge and precipitate the reaction solution after mechanical vibration in step 2), collect the precipitate and dissolve it in ultrapure water to obtain the product core-shell structure nano-silver (Ag@PTA), and perform SEM and TEM on the prepared nano-silver shooting, such...

Embodiment 2

[0041] A method for preparing a core-shell structure nano-silver antibacterial material based on plant polyphenols, using the following steps:

[0042] 1) The AgNO 3 Dissolve in phosphate buffer at pH=8, then dissolve tannic acid in ultrapure water;

[0043] 2) Add the tannic acid solution obtained in step 1) dropwise to the AgNO obtained in step 1) 3 solution, at room temperature, vibrate with a mechanical oscillator for 12 minutes, centrifuge the reaction solution, collect the precipitate and dissolve it in ultrapure water to obtain the product, wherein the tannic acid and AgNO 3 The mass ratio of is 1:55, and the concentration of the phosphate buffer is 11 mM.

[0044] 3) Centrifuge and precipitate the reaction solution after mechanical vibration in step 2), collect the precipitate and dissolve it in ultrapure water to obtain the product core-shell structure nano-silver (Ag@PTA).

[0045] The nano-silver with a core-shell structure prepared in this example has regular sh...

Embodiment 3

[0047] A method for preparing a core-shell structure nano-silver antibacterial material based on plant polyphenols, using the following steps:

[0048] 1) The AgNO 3 Dissolve in phosphate buffer at pH=10, then dissolve tannic acid in ultrapure water;

[0049] 2) Add the tannic acid solution obtained in step 1) dropwise to the AgNO obtained in step 1) 3 solution, at room temperature, vibrate with a mechanical oscillator for 25 minutes, centrifuge the reaction solution, collect the precipitate and dissolve it in ultrapure water to obtain the product, wherein the tannic acid and AgNO 3 The mass ratio of is 1:100, and the concentration of the phosphate buffer is 20mM.

[0050] 3) Centrifuge and precipitate the reaction solution after mechanical vibration in step 2), collect the precipitate and dissolve it in ultrapure water to obtain the product core-shell structure nano-silver (Ag@PTA).

[0051] The nano-silver with a core-shell structure prepared in this example has regular s...

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Abstract

The invention relates to a plant polyphenol based preparation method of a core-shell structural nano-silver antibacterial material. The method is characterized in that room-temperature green water-phase synthesis is carried out; silver nitrate and plant polyphenol-gallotannic acid are taken as reacting materials to prepare the core-shell structural nano-silver antibacterial material in a one-pot manner. The method comprises the following steps: dissolving AgNO3 into a phosphate buffering solution with pH value of 6-10; dissolving gallotannic acid (TA) into ultrapure water; adding gallotannic acid (TA) into the AgNO3 solution; oscillating for 5-20min under room temperature through a mechanical oscillator; reacting and then centrifugally precipitating; collecting precipitates; and dissolvingthe precipitates into the ultrapure water to obtain the product Ag@PTA. The prepared core-shell structural nano-silver antibacterial material is high in antibacterial performance; the preparation method is simple, energy saving, environmentally-friendly, and free from heating; the raw materials are green and environmentally-friendly; and the method for preparing the antibacterial material is convenient to be widely popularized.

Description

technical field [0001] The invention relates to a method for preparing a core-shell structure nano-silver antibacterial material based on plant polyphenols, and belongs to the field of nano-composite materials. Background technique [0002] As people pay more and more attention to environmental and health issues, the application of antibacterial materials is becoming more and more intense, and antibacterial products have broad market prospects. The so-called antibacterial materials refer to functional materials that can inhibit the growth, reproduction and survival of bacteria within a certain period of time. At present, according to the different types of materials, it can be divided into organic antibacterial materials, inorganic antibacterial materials and antibacterial surface interfaces. Nano-inorganic antibacterial materials are a new type of antibacterial materials. Compared with organic antibacterial agents, especially antibiotics, they have attracted much attention...

Claims

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Application Information

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IPC IPC(8): A01N25/26A01N59/16A01P3/00A01P1/00
CPCA01N25/26A01N59/16
Inventor 方艳刘婧媛姜岷马江锋信丰学董维亮章文明
Owner NANJING UNIV OF TECH
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