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Related Concept Videos

X-ray Diffraction of Biological Samples01:10

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
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Can X-Ray Powder Diffraction Be a Suitable Forensic Method for Illicit Drug Identification?

Bronislav Jurásek1, Vilém Bartůněk2, Štěpán Huber2

  • 1Forensic Laboratory of Biologically Active Substances, Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague, Prague, Czechia.

Frontiers in Chemistry
|July 14, 2020
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Summary

X-ray powder diffraction (XRPD) effectively identifies new psychoactive substances (NPSs) in illicit drug samples. This method offers a valuable forensic tool, surpassing limitations of traditional Infrared (IR) and Raman spectroscopy for NPS detection.

Keywords:
Raman spectroscopyX-ray powder diffractiondrug detectioninfrared spectroscopynew psychoactive substances

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Materials Science

Background:

  • New psychoactive substances (NPSs) pose increasing public health risks due to widespread availability.
  • Traditional detection methods like Infrared (IR) and Raman spectroscopy have limitations in identifying NPSs, especially in complex mixtures or when fluorescence is present.
  • There is a critical need for sensitive and reliable methods to detect NPSs in forensic samples.

Purpose of the Study:

  • To investigate the potential of X-ray powder diffraction (XRPD) as a method for identifying NPSs in black market samples.
  • To compare the efficacy of XRPD with conventional IR and Raman spectroscopy for NPS detection.
  • To evaluate XRPD's capability in identifying individual compounds within illicit drug mixtures.

Main Methods:

  • Analysis of seized illicit drug samples, including heroin, cocaine, mephedrone, ephylone, butylone, JWH-073, and naphyrone, using X-ray powder diffraction (XRPD).
  • Comparison of diffraction patterns obtained from seized samples with those of known standards.
  • Simultaneous analysis of the same samples using Infrared (IR) and Raman spectroscopy.

Main Results:

  • XRPD successfully identified all tested psychoactive substances by comparing their diffraction patterns to reference standards.
  • Infrared (IR) and Raman spectroscopy failed to detect or identify compounds in all tested samples, highlighting their limitations.
  • XRPD demonstrated superior capability in distinguishing and identifying individual NPS compounds, even in potentially mixed samples.

Conclusions:

  • X-ray powder diffraction (XRPD) is a highly effective technique for the identification of new psychoactive substances (NPSs) in illicit drug samples.
  • XRPD offers a significant advantage over IR and Raman spectroscopy for forensic analysis of NPSs, particularly in challenging sample matrices.
  • XRPD should be considered a valuable complementary tool for forensic laboratories involved in the detection and identification of NPSs.