Tandem DART™ MS Methods for Methadone Analysis in Unprocessed Urine.

Area of Science:

• Forensic Toxicology
• Analytical Chemistry

Background:

• Traditional methadone analysis in urine uses enzyme immunoassays (EIA) and chromatography-mass spectrometry (GC-MS or LC-MS-MS).
• These methods often require extensive sample preparation, are costly, and time-consuming, with results taking several days.

Purpose of the Study:

• To introduce and evaluate Direct Analysis in Real Time (DART™) coupled with mass spectrometry for rapid methadone screening and confirmation.
• To assess the feasibility of DART™ MS as a cost-effective and time-efficient alternative for routine drug screening.

Main Methods:

• Utilized Direct Analysis in Real Time (DART™) coupled with time-of-flight and triple quadrupole linear ion trap (Q-TRAP™) mass spectrometers.
• Analyzed untreated urine specimens without requiring sample clean-up or expensive kits.
• Evaluated method performance including limits of detection, precision, selectivity, specificity, recovery, stability, and robustness.

Main Results:

• Achieved rapid combined screening and confirmation in under 5 minutes per sample.
• Demonstrated high specificity and selectivity for methadone detection.
• Established a limit of detection at 250 ng/mL, consistent with current EIA cutoffs (300 ng/mL).

Conclusions:

• DART™ MS provides a fast, specific, and selective method for methadone analysis in untreated urine.
• This platform offers significant savings in time and resources compared to conventional EIA and chromatography-MS techniques.
• DART™ MS shows strong potential for routine drug screening applications.