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SERS method for detection of lead ions based on Ag@Au nanoparticles

A nanoparticle and lead ion technology, applied in nanotechnology, nanotechnology, nanomedicine, etc. for materials and surface science, can solve problems such as expensive equipment, complex and time-consuming processing, and unsuitable for general application

Inactive Publication Date: 2018-02-16
杨蕾
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem to be solved: traditional Pb 2+ The equipment required for the instrumental detection method is expensive, the sample pretreatment is complicated and time-consuming, and requires professional operators to operate, which is not suitable for general application and is only suitable for central laboratory analysis

Method used

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  • SERS method for detection of lead ions based on Ag@Au nanoparticles
  • SERS method for detection of lead ions based on Ag@Au nanoparticles

Examples

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Embodiment 1

[0022] An ultrasensitive colorimetric sensing detection method for measuring ochratoxin A, comprising the following specific steps:

[0023] (1) Synthesis of Ag nanoparticles

[0024] Weigh 85mg AgNO 3 Place in a 500mL Erlenmeyer flask, then add 250mL of ultrapure water, the AgNO 3 Configured to a concentration of 2mM, the AgNO 3 After the solution was stirred and heated to boiling, 6 mL of sodium citrate aqueous solution with a mass fraction of 1% was added quickly, continued heating and stirring for 40 min, turned off the heating switch, and continued stirring until the solution was cooled to room temperature, and the yellow solution produced after the reaction was Ag nanoparticles.

[0025] (2) Synthesis of Ag@Au nanoparticles

[0026] Take 50mL of Ag nanoparticles prepared in step (1), add 2mL of 8mM hydroxylamine hydrochloride and 5mL of chloroauric acid solution with a mass fraction of 0.1% dropwise under vigorous stirring, and continue stirring for 30min to obtain Ag...

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Abstract

The invention discloses an SERS method for detection of lead ions based on Ag@Au nanoparticles, and belongs to the field of biological detection. By means of a principle that the presence of Pb<2+> can accelerate leaching of sodium thiosulfate and 2-mercaptoethanol on nano gold, Pb<2+> with different concentrations is added to Ag@Au composite nanoparticles containing sodium thiosulfate and 2-mercaptoethanol, and a gold shell of the Ag@Au nanoparticles is leached so as to cause change of the thickness of the gold shell; beacon molecules are added, and then different Raman signal intensities areproduced. According to the correspondence relationship between the Pb<2+> concentration and the SERS signal intensity, the Pb<2+> can be quantitatively detected. The method has the advantages of highdetection speed, low detection cost, ultra high sensitivity and good specificity, and can satisfy the detection requirements of Pb<2+> in actual samples.

Description

technical field [0001] The invention belongs to the field of biological detection, and in particular relates to a SERS method for detecting lead ions based on Ag@Au nanoparticles. Background technique [0002] The pollution of heavy metal ions refers to the environmental pollution caused by heavy metals or their compounds. The pollution of heavy metal ions is difficult to be degraded by microorganisms in the environment and enriched in humans, animals and plants, thus causing great harm to the environment and human health. . Lead is a toxic heavy metal that can be enriched in human and animal tissues. It mainly comes from industries such as batteries, smelting, hardware, electroplating, and cosmetics. Lead enters the body through the skin, digestive tract, and respiratory tract to interact with various organs. And the effect, thereby causing the nervous dysfunction of the human body, kidney damage, immune system damage, etc., children, the elderly, and people with low immun...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y30/00B82Y5/00
Inventor 杨蕾
Owner 杨蕾
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