Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 241, Issue -, Pages 376-382Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.10.094
Keywords
Au dotted magnetic sheets; Thiocyanate; SERS
Funding
- National Natural Science Foundation of China [21475088]
- International Joint Laboratory on Resource Chemistry (IJLRC)
- Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
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Abuse of thiocyanate (SCN-) in food products results in the people's health risks. Detection of SCN-residue in milk and infant formula calls for rapid and sensitive analytical protocols. In this work, Au nanoparticles dotted magnetic sheets (Au-MGS) with the help of inositol hexakisphosphate (IP6) were used as surface enhanced Raman scattering (SERS) substrate for sensitively detecting trace SCN- in milk. Since IP6 served as binding and stable agent to chelate with metal ions, the Au-MGS represented uniformity and stability as well as the well-dispersive Au nanoparticles. As a result, the limit of detection (LOD) reached 10(-8) g/L. Additionally, with aiding by an external magnet inducing, Au-MGS substrate further presented improved SERS activity. By using a portable Raman spectrometer, such Au-MGS based SERS assay could be expected to be used for in situ detection of SCN- in milk on markets as well as for determination of SCN- in saliva from the smoker. (C) 2016 Elsevier B.V. All rights reserved.
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