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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Rapid Detection and Quantification of Novel Psychoactive Substances (NPS) Using Raman Spectroscopy and

Howbeer Muhamadali1,2, Alexandra Watt2, Yun Xu1,2

  • 1Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom.

Frontiers in Chemistry
|July 6, 2019
PubMed
Summary

Rapid detection of novel psychoactive substances (NPS) is crucial. Raman spectroscopy and surface-enhanced Raman scattering (SERS) offer portable, sensitive methods for identifying and quantifying diverse NPS, including mixtures in urine.

Keywords:
SERSdrug detectionpsychoactive compoundsramanspectroscopy

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Area of Science:

  • Analytical Chemistry
  • Forensic Science
  • Spectroscopy

Background:

  • The increasing prevalence and variety of novel psychoactive substances (NPS) pose significant public health risks.
  • Existing analytical methods for NPS detection often lack the speed, sensitivity, or portability required for effective field testing.
  • There is a critical need for rapid, sensitive, and specific quantitative detection techniques for NPS.

Purpose of the Study:

  • To demonstrate the application of Raman spectroscopy and surface-enhanced Raman scattering (SERS) combined with chemometrics for the rapid, portable, quantitative detection and discrimination of NPS.
  • To analyze a range of methcathinone and aminoindane derivatives in both powder and solution forms.
  • To assess the potential for simultaneous detection of multiple NPS in complex matrices like human urine.

Main Methods:

  • Utilized Raman spectroscopy and SERS coupled with chemometric analysis for compound classification and quantification.
  • Investigated methcathinone and aminoindane derivatives, diphenidines, and synthetic cannabinoids.
  • Performed multiplexed quantitative detection of mephedrone and its metabolites in water and human urine samples.

Main Results:

  • Raman spectra enabled clear separation and classification of NPS based on core chemical structures.
  • SERS provided enhanced sensitivity with limits of detection down to approximately 2 mM (0.41 g L⁻¹).
  • Successful simultaneous quantitative detection of mephedrone and its metabolites in tertiary mixtures was achieved without prior separation.

Conclusions:

  • Raman spectroscopy and SERS are effective, portable techniques for rapid identification and quantification of NPS.
  • SERS offers improved sensitivity and the capability for simultaneous detection of multiple NPS in complex samples.
  • These methods hold significant potential for field testing and forensic applications, aiding in the control of illicit substances.