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Method validation of the biochip array technology for synthetic cannabinoids detection in urine.

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A new immunoassay for synthetic cannabinoids (SC) in urine was validated. Optimized cutoff concentrations significantly improved detection accuracy for these difficult-to-detect drugs.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry

Background:

  • Synthetic cannabinoids (SC) are frequently abused drugs.
  • Traditional immunoassays struggle to detect SC, complicating drug screening.

Purpose of the Study:

  • To validate the first commercial immunoassay for detecting synthetic cannabinoids in urine.
  • To assess the assay's performance characteristics, including sensitivity, specificity, and efficiency.

Main Methods:

  • Validation of a high-throughput urine immunoassay for SC detection.
  • Determination of limits of detection, imprecision, and cross-reactivity with 22 SC and 37 metabolites.
  • Performance evaluation using LC-MS/MS confirmation on 20,017 urine specimens.

Main Results:

  • Initial assay showed high sensitivity (98.3%) but low specificity (48.1%) and efficiency (53.9%).
  • A significant negative bias (-80.8 to -28.0%) was observed.
  • Optimizing cutoff concentrations enhanced performance to 87.6% sensitivity, 85.2% specificity, and 85.4% efficiency.

Conclusions:

  • The validated high-throughput urine SC assay demonstrates good sensitivity.
  • Modified cutoff concentrations substantially improve the assay's specificity and efficiency for detecting synthetic cannabinoids.