Opiates are commonly abused substances, and forensic urine drug-testing for them involves an immunoassay screen and gas chromatographic/mass spectrometric (GC/MS) confirmation. There are also medical reasons to test urine for opiates, and confirmation procedures other than GC/MS are often used for medical drug-testing which are more compatible with the demands of clinical services and which identify a wider range of opiates than those in standard forensic batteries. One such procedure involves thin-layer chromatographic (TLC) analysis of opiate derivatives and can distinguish eight clinically encountered opiates, including morphine, acetylmorphine, hydromorphone, oxymorphone, codeine, dihydrocodeine, hydrocodone, and oxycodone. Medical drug-testing results are sometimes challenged by patients, causing physicians to request additional confirmation of the identified opiates. To our knowledge, no previous report examines all opiates specified above in a single GC/MS pr ocedure, but we find that they can be distinguished by GC/MS analyses of trimethylsilyl (TMS) ether derivatives, the mass spectra of which contain prominent molecular ions. Inclusion of deuterium-labeled internal standards permits quantitation of each of the eight opiates in urine. The GC/MS assay is linear over a concentration range which spans the TLC cutoff level, and coefficients of variation of 10% or less at concentrations below the TLC cutoff are achieved by for all opiates specified above except for oxymorphone and oxycodone, which exhibit coefficients of variation of 18-19%. This procedure has proved useful as a third-stage identification step for medical drug-testing specimens in which results from prior immunoassay and TLC analyses were challenged.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR000954-24
Application #
6336821
Study Section
Project Start
2000-08-01
Project End
2001-07-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
24
Fiscal Year
2000
Total Cost
$6,028
Indirect Cost
Name
Washington University
Department
Type
DUNS #
062761671
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
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