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Related Concept Videos

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Cannabinoid Stability in Antemortem and Postmortem Blood.

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Drug stability in forensic toxicology is crucial. This study found that cannabinoids like THC degrade over time in blood samples, with varying stability based on storage temperature and sample type. Prompt analysis is recommended.

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Area of Science:

  • Forensic toxicology
  • Analytical chemistry
  • Pharmacology

Background:

  • Accurate quantification of drugs in toxicological testing is essential for reliable results and data interpretation.
  • Previous studies have investigated drug stability, but further evaluation of various cannabinoids in different biological matrices is needed.
  • Understanding cannabinoid stability is critical for forensic casework involving antemortem and postmortem samples.

Purpose of the Study:

  • To assess the stability of key cannabinoids, including Δ-9-tetrahydrocannabinol (THC), 11-hydroxy-THC, 11-nor-9-carboxy-THC, Cannabinol, and Cannabidiol.
  • To evaluate the impact of refrigerated (4°C) and frozen (-4°C) storage conditions on cannabinoid concentrations in both antemortem and postmortem blood over a 6-month period.
  • To provide data that can inform best practices for the storage and analysis of biological samples in forensic toxicology.

Main Methods:

  • Pooled antemortem and postmortem blood samples were fortified with cannabinoids at low and high concentrations.
  • Samples were stored in untreated glass vials under refrigerated (4°C) and frozen (-4°C) conditions for 6 months.
  • Automated extraction followed by liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) was used to analyze cannabinoid concentrations 12 times over the study period.

Main Results:

  • Cannabinoids exhibited greater stability in refrigerated antemortem blood compared to frozen samples.
  • In postmortem blood, frozen storage improved the stability of THC, 11-hydroxy-THC, 11-nor-9-carboxy-THC, and Cannabinol, particularly at lower concentrations.
  • Significant decreases in cannabinoid concentrations were observed over the 6-month storage period, indicating potential degradation.

Conclusions:

  • Cannabinoid concentrations can decrease over time when blood samples are stored in untreated glass vials.
  • Storage conditions significantly influence cannabinoid stability, with refrigerated storage favoring antemortem samples and frozen storage benefiting postmortem samples.
  • Prompt analysis of biological samples containing cannabinoids is recommended to ensure the accuracy of toxicological results.