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Related Concept Videos

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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
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Rapid through-container detection of fake spirits and methanol quantification with handheld Raman spectroscopy.

D I Ellis1, H Muhamadali2, Y Xu2

  • 1Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, M1 7DN, UK. D.Ellis@manchester.ac.uk.

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Summary

Handheld Raman spectroscopy can detect counterfeit spirits through containers, identifying harmful methanol. This technology offers rapid, in-situ analysis for product authenticity and consumer safety in the global spirits industry.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Food Science

Background:

  • The global spirits industry faces significant economic impact from counterfeiting.
  • Counterfeit spirits pose direct health risks due to toxic adulterants like methanol.
  • Ensuring spirit authenticity is crucial for consumer confidence and industry integrity.

Purpose of the Study:

  • To evaluate handheld Raman spectroscopy for through-container detection of counterfeit spirits.
  • To identify chemical markers indicative of counterfeit alcohol.
  • To quantify methanol levels in spirit samples.

Main Methods:

  • Utilized handheld Raman spectroscopy with near-infrared excitation (1064 nm).
  • Performed through-container analysis of various spirit drinks.
  • Established limits of detection for methanol in different spirit types.

Main Results:

  • Successfully differentiated multiple spirit drinks through their containers.
  • Detected various chemical markers associated with counterfeit alcohol.
  • Achieved methanol detection limits between 0.23-0.39%, below harmful thresholds.

Conclusions:

  • Handheld Raman spectroscopy is a practical tool for rapid, in-situ detection of counterfeit spirits.
  • The technology can safeguard product authenticity and consumer health.
  • Potential applications extend to other beverages and liquid sample analysis.