A novel surface-enhanced Raman scattering sensor to detect prohibited colorants in food by graphene/silver nanocomposite

A novel surface-enhanced Raman scattering (SERS) sensor made up of a graphene and silver nanocomposite was developed for detecting prohibited colorants in food. This SERS platform exhibited an excellent enrichment effect between the colorant molecules and the graphene and an ability to enhance the R...

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Bibliographic Details
Published in:Talanta (Oxford) 2012-10, Vol.100, p.32-37
Main Authors: Xie, Yunfei, Li, Yan, Niu, Li, Wang, Heya, Qian, He, Yao, Weirong
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Food Coloring Agents - analysis
Food Contamination - analysis
Food Contamination - legislation & jurisprudence
General, instrumentation
Graphene/silver nanocomposite
Graphite - chemistry
Metal Nanoparticles - chemistry
Prohibited colorants
Rapid detection
Silver - chemistry
Spectrometric and optical methods
Spectrum Analysis, Raman - methods
Surface Properties
Surface-enhanced Raman scattering (SERS)
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Summary:A novel surface-enhanced Raman scattering (SERS) sensor made up of a graphene and silver nanocomposite was developed for detecting prohibited colorants in food. This SERS platform exhibited an excellent enrichment effect between the colorant molecules and the graphene and an ability to enhance the Raman spectra of the silver nanoparticles. Detection of different concentrations of each prohibited colorant was carried out by SERS measurements on this novel substrate. In addition, from the SERS spectra of a mixture of four kinds of prohibited colorants, it was possible to easily distinguish each colorant by its characteristic peaks. A control experiment was also performed to compare the SERS spectra obtained using the graphene/silver nanocomposite substrate with spectra obtained using Ag alone as a substrate. The results showed that the SERS nanocomposite was better for detecting prohibited colorants. The proposed method has advantages in terms of providing a simple and rapid method for the sensitive analysis of prohibited additive colorants in food. ► We design a novel SERS sensor made up of graphene/silver nanocomposite. ► We establish a rapid detection method for prohibited colorants. ► The detection limit of the colorant can be as low as 0.1μM. ► A mixture of four kinds of prohibited colorants can be easily distinguished by its characteristic peaks.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2012.07.080