Surface enhanced Raman substrate material for detecting nitrite and preparation method thereof

A surface-enhanced Raman and nitrite technology, applied in the field of analysis and detection, can solve the problems of long time, complicated operation, complicated equipment, etc., and achieve the effect of low cost, simple method and strong surface.

Inactive Publication Date: 2017-09-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nitrite is closely related to our life. Traditional detection methods include liquid chromatography, gas chromatography-mass spectrometry, kits, etc. These methods are complicated to operate, take a long time and the instruments are expensive
Chinese patent application (CN102519890A) detects nitrite ion by the diazotization reaction of benzidine or its derivatives, although this method is simple, this invention has certain limitations
When the detected sample is not analytically pure, purification is required; when the conditions are not mild, complex equipment is required, which is uneconomical

Method used

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  • Surface enhanced Raman substrate material for detecting nitrite and preparation method thereof
  • Surface enhanced Raman substrate material for detecting nitrite and preparation method thereof
  • Surface enhanced Raman substrate material for detecting nitrite and preparation method thereof

Examples

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Embodiment 1

[0026] Example 1 Preparation of surface-enhanced Raman substrate material

[0027] (1) Preparation of gold nanorods by seed crystal method:

[0028] a. Preparation of gold nano seed solution: at room temperature (20-25°C), prepare 9.75mL 0.1mol / L cetyl ammonium bromide aqueous solution, stir evenly until transparent, add dropwise 0.25mL 0.01mol / L chloroauric acid Aqueous solution, after it is evenly dispersed in the solution, quickly add 0.6mL of freshly prepared 0.01mol / L sodium borohydride solution (ice-water bath), the solution turns from light yellow to brownish yellow, stir evenly for 3min, and stand at room temperature for 2h before use .

[0029] b. Preparation and purification of gold nanorod solution: at room temperature, prepare 10 mL of 0.1 mol / L cetyltrimethylammonium bromide aqueous solution, then add 0.5 mL of 0.01 mol / L chloroauric acid aqueous solution, mix well and then Add 0.1mL 0.01mol / L silver nitrate, 0.2mL mol / L hydrochloric acid, stir well, add 80μL 0....

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Abstract

The invention discloses a surface enhanced Raman substrate material for detecting nitrite and a preparation method thereof. The preparation method comprises the following specific steps: (1) synthesizing a gold nano-rod by a crystal seed method; (2) preparing a p-mercaptoaniline modified gold nano-rod material; (3) synthesizing a gold nano-sphere by a hydrothermal method; (4) preparing a 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material; (5) mixing the p-mercaptoaniline modified gold nano-rod material and nitrite to generate diazonium salt; (6) mixing the diazonium salt and the 1-amino-8-metcaptonaphthalene modified gold nano-sphere composite material to generate azo-dye; (7) indirectly carrying out qualitative and quantitative detection on the nitrite by utilizing a surface enhanced Raman spectrum signal of the azo-dye. The surface enhanced Raman substrate material disclosed by the invention has good surface enhanced Raman activity on a substrate and can be used for rapidly detecting the nitrite in the environment and food samples.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a surface-enhanced Raman base material for detecting nitrite and a preparation method thereof. Background technique [0002] Nitrite widely exists in the human environment, and the nitrate in the human body can be reduced to nitrite under the action of microorganisms; it can be used as a color-protecting agent for meat products in the food industry, and is often added to bacon and ham to increase its color. Make it beautiful; also acts as a preservative. The color and taste of nitrite are similar to table salt and difficult to distinguish. High doses of nitrite are highly toxic and can affect the functioning of red blood cells, leading to hypoxic death. Under conditions such as cooking, nitrite degrades with amino acids to generate nitrosamines, which are highly carcinogenic. Nitrite is closely related to our life. Traditional detection methods inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹邓维段化珍马亚丹
Owner SHANGHAI INST OF TECH
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