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Related Experiment Videos

CEDIA dau Benzodiazepine screening assay: a reformulation

R C Meatherall1, A D Fraser

  • 1Biochemistry Laboratory, St. Boniface General Hospital, Winnipeg, Manitoba, Canada.

Journal of Analytical Toxicology
|July 29, 1998
PubMed
Summary

The reformulated CEDIA dau Benzodiazepine assay effectively detects benzodiazepine glucuronides in urine through online hydrolysis. This enhanced assay improves detection of low-dose benzodiazepines, crucial for accurate drug screening.

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Area of Science:

  • Clinical Chemistry
  • Forensic Toxicology
  • Immunoassay Development

Background:

  • Benzodiazepine glucuronide conjugates are major urinary metabolites.
  • Accurate detection of low-dose benzodiazepines is challenging due to low metabolite concentrations.
  • Existing immunoassays may require hydrolysis for optimal sensitivity.

Purpose of the Study:

  • To evaluate a reformulated CEDIA dau Benzodiazepine assay with online hydrolysis.
  • To assess the assay's performance for detecting urinary benzodiazepine glucuronides.
  • To compare online hydrolysis with offline hydrolysis and no hydrolysis.

Main Methods:

  • Reformulation of the CEDIA dau Benzodiazepine assay to include online hydrolysis.
  • Evaluation using lorazepam as a probe drug in human urine samples.

Related Experiment Videos

  • Comparison of E. coli beta-glucuronidase (online) with Helix pomatia beta-glucuronidase (offline) hydrolysis.
  • Assay performance assessed using a nitrazepam calibration cutoff.

    • Main Results:

    • The reformulated assay detected benzodiazepines in urine samples for 5-24 h to 2-35 h post-dose.
    • Online hydrolysis with E. coli beta-glucuronidase showed no significant difference from offline hydrolysis.
    • Urine samples tested negative without hydrolysis, highlighting the necessity of the hydrolysis step.
    • Lorazepam glucuronide showed significant cross-reactivity with online hydrolysis (72-136%).

    Conclusions:

    • The reformulated CEDIA dau Benzodiazepine assay with online hydrolysis is effective for detecting urinary benzodiazepine glucuronides.
    • The assay demonstrates enhanced sensitivity for low-dose benzodiazepines.
    • Online hydrolysis provides a practical and effective method for improving benzodiazepine detection in urine drug screening.