Substrate available for detecting selectivity of anionic/cationic pigment

An anion-cation, selective technology, applied in material excitation analysis, Raman scattering, etc., can solve problems such as interference SERS signal detection, and achieve the effect of easy operation

Inactive Publication Date: 2016-01-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, it is feasible to use SERS active substrates for the monitoring and analysis of food pigments, but one of the main problems limiting its application is that the complex matrix in the actual food system will interfere with the detection of SERS signals

Method used

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  • Substrate available for detecting selectivity of anionic/cationic pigment
  • Substrate available for detecting selectivity of anionic/cationic pigment
  • Substrate available for detecting selectivity of anionic/cationic pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1Fe 3 o 4 Preparation of nanoparticles: 2.7g FeCl 3 ·6H 2 O mixed with 7.2g sodium acetate and 100mL ethylene glycol and stirred magnetically for 1h, reacted at a high temperature of 200°C for 12h, dried the product in vacuum at 50°C for 2h, and collected Fe 3 o 4 Magnetic nanoparticles; Fe 3 o 4 / SiO 2 Preparation of magnetic particles: get the nano-Fe prepared in 0.2g step (1) 3 o 4 Disperse in 20mL nitric acid solution (0.1mol / L), sonicate for 10min, wash 6 times with deionized water, disperse in the mixture (20mL ethanol + 4mL deionized water), sonicate for 10min, pour into a three-neck round bottom flask, Continuously add 1mL of ammonia water and 0.8mLTEOS dropwise under mechanical stirring. After the reaction is carried out for 3h, the resulting precipitate is dried in vacuum at 60°C for 1h to obtain Fe 3 o 4 / SiO 2 nanoparticles. Take 0.1mgFe 3 o 4 / SiO 2 Disperse the magnetic particles into 100mL of 2% PDDA solution (10mL of 20% PDDA + 90m...

Embodiment 2

[0026] Example 2 The preparation method of the selective detection SERS substrate modified by polyelectrolysis is the same as that in Example 1. Enrichment and detection of pigment mixed solution: Disperse 0.2 mg polyelectrolyte-modified magnetic nanoparticles in 1 mL of pigment mixed solution, and the concentration of each of the two pigments is 1×10 -4 mol / L. After 1 hour, the magnetic particles were collected with an external magnetic field, and the pigment-enriched magnetic particles were placed on a silicon wafer, and the signal was collected by a portable Raman spectrometer with a scanning time of 5 s to obtain the SERS spectrum of the pigment mixture.

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Abstract

The invention discloses a Fe3O4 / SiO2 / Au magnetic particle, and a method for modifying the surface of the magnetic particle through utilizing cationic polyelectrolyte and anionic polyelectrolyte, wherein the method enables an anionic pigment of sunset yellow FCF and a cationic pigment of malachite green to be selectively gathered on the surface of a magnetic substrate. Raman characteristic peaks of the anionic and cationic pigments are observed, respectively, through a portable Raman spectrometer. It is proved through a series of experiments that a sample preparation method and a target object analysis method adopted in the invention are simple to operate, and selective detection of pigments is achieved.

Description

technical field [0001] The present invention relates to a method for the selective detection of anion and cation pigments using a magnetic substrate, especially the use of polyelectrolyte-modified Fe 3 o 4 / SiO 2 A method for the selective detection of anionic pigment sunset yellow and cationic pigment malachite green on / Au magnetic substrate. technical background [0002] In 1928, the Indian physicist Raman discovered the Raman scattering effect, and the Raman spectroscopy (RS) technology established on this basis has a wide range of applications in the fields of molecular structure and analytical chemistry. In 1974, Fleischmann et al first observed the Surface Enhanced Raman Scattering (Surface Enhanced Raman Scattering) of pyridine on a rough silver electrode, referred to as the SERS phenomenon. By 1997, the SERS effect realized single-molecule detection. Subsequently, due to the rapid development of nanotechnology, SERS The research has also achieved certain results....

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 景传勇孙振丽杜晶晶田中群
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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