Method for detecting nitrite ions based on gold-silver core-shell nano-particle SERS technology

A technology of nitrite ions and nanoparticles, which is applied in the fields of food safety and material chemistry to achieve the effects of improving detection speed, good enhancement effect and wide detection range

Inactive Publication Date: 2019-07-05
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for detecting nitrite ions based on gold-silver core-shell nano-particle SERS technology
  • Method for detecting nitrite ions based on gold-silver core-shell nano-particle SERS technology
  • Method for detecting nitrite ions based on gold-silver core-shell nano-particle SERS technology

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Embodiment 1

[0034] (1) Preparation of gold nanoparticles: mix 0.5 mL of 0.1M chloroauric acid and 200.0 mL of deionized water and heat to boiling under magnetic stirring, add 3.0 mL of 1% trisodium citrate, and stir the mixed solution for 30 minutes Until it becomes wine red, gold nanoparticles are successfully synthesized;

[0035] (2) Preparation of gold and silver core-shell nanoparticle solution: add 1% trisodium citrate 8.0mL to the boiling gold nanoparticle solution, add 1mM silver nitrate 34.0mL dropwise at a rate of one drop every 30s, and the solution continues Stir for 30 minutes, with the color changing from wine red to orange; centrifuge at 12000.0 rpm for 8 minutes; dry at room temperature to obtain gold and silver core-shell nanoparticles, add deionized water to dissolve, and set aside; figure 1 As shown, figure 1 Where a is the SEM characterization diagram of the gold-silver core-shell nanoparticles under the condition of 0.5μm; b is the SEM characterization diagram of the gold...

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Abstract

The invention belongs to the technical field of food safety and material chemistry, and relates to a method for detecting nitrite ions based on a gold-silver core-shell nano-particle SERS technology.The method comprises the steps that a gold-silver core-shell nano-particle solution is prepared; nitrite ion solutions of different concentrations are prepared; a p-aminothiophenol solution and 1-naphthylamine are added respectively, and then a gold-silver core-shell nanoparticle solution is added; a raman spectrometer is used to collect raman spectra of nitrite ions of different concentrations; astandard curve of the raman signal intensity corresponding to the nitrite ion concentration is established; a sample to be tested is selected to react with p-aminothiophenol; 1- naphthylamine is added for reaction, and then the gold-silver core-shell nanoparticle solution is added for reaction; the raman spectrometer is used to collect spectra; and the concentration of the nitrite ions of the sample to be tested is acquired according to the established standard curve. According to the invention, a non-labeling method is used to detect nitrite ions, which saves the detection cost and improvesthe detection speed and stability.

Description

Technical field [0001] The invention belongs to the technical field of food safety and material chemistry, and specifically relates to a method for detecting nitrite ions based on the gold-silver core-shell nanoparticle SERS technology. Background technique [0002] Nitrite is a class of inorganic compounds containing nitrite ions. It is widely found in the environment, water and food. It is an important part of the nitrogen cycle in the ecosystem. In the field of biochemistry, nitrite is a vasodilator One of the important sources of nitric oxide. Nitrate widely present in vegetables and fruits will produce a large amount of nitrite under the action of nitrosating bacteria, so pickled vegetables often contain a large amount of nitrite. In addition, nitrite can inhibit Clostridium spp. Therefore, nitrite is often used in the production and preservation of processed meat products such as bacon. When high-dose nitrite enters the human body, the accumulation of methemoglobin increas...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 王井井陈全胜王安成许艺焦天慧
Owner JIANGSU UNIV
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