title: Quantitative urine confirmatory testing for synthetic cannabinoids in randomly collected urine specimens.
abstract: Synthetic cannabinoid intake is an ongoing health issue worldwide, with new compounds continually emerging, making drug testing complex. Parent synthetic cannabinoids are rarely detected in urine, the most common matrix employed in workplace drug testing. Optimal identification of synthetic cannabinoid markers in authentic urine specimens and correlation of metabolite concentrations and toxicities would improve synthetic cannabinoid result interpretation. We screened 20 017 randomly collected US military urine specimens between July 2011 and June 2012 with a synthetic cannabinoid immunoassay yielding 1432 presumptive positive specimens. We analyzed all presumptive positive and 1069 negative specimens with our qualitative synthetic cannabinoid liquid chromatography-tandem mass spectrometry (LC-MS/MS) method, which confirmed 290 positive specimens. All 290 positive and 487 randomly selected negative specimens were quantified with the most comprehensive urine quantitative LC-MS/MS method published to date; 290 specimens confirmed positive for 22 metabolites from 11 parent synthetic cannabinoids. The five most predominant metabolites were JWH-018 pentanoic acid (93%), JWH-N-hydroxypentyl (84%), AM2201 N-hydroxypentyl (69%), JWH-073 butanoic acid (69%), and JWH-122 N-hydroxypentyl (45%) with 11.1 (0.1-2,434), 5.1 (0.1-1,239), 2.0 (0.1-321), 1.1 (0.1-48.6), and 1.1 (0.1-250) µg/L median (range) concentrations, respectively. Alkyl hydroxy and carboxy metabolites provided suitable biomarkers for 11 parent synthetic cannabinoids; although hydroxyindoles were also observed. This is by far the largest data set of synthetic cannabinoid metabolites urine concentrations from randomly collected workplace drug testing specimens rather than acute intoxications or driving under the influence of drugs. These data improve the interpretation of synthetic cannabinoid urine test results and suggest suitable urine markers of synthetic cannabinoid intake.
authors.affiliation: Chemistry and Drug Metabolism, National Institute on Drug Abuse, NIH, Baltimore, MD, USA.|Program in Toxicology, University of Maryland Baltimore, Baltimore, MD, USA.
authors.forename: Marisol S
authors.initials: MS
authors.lastname: Castaneto
authors.affiliation: Chemistry and Drug Metabolism, National Institute on Drug Abuse, NIH, Baltimore, MD, USA.
authors.forename: Karl B
authors.initials: KB
authors.lastname: Scheidweiler
authors.affiliation: Chemistry and Drug Metabolism, National Institute on Drug Abuse, NIH, Baltimore, MD, USA.
authors.forename: Adarsh
authors.initials: A
authors.lastname: Gandhi
authors.affiliation: Chemistry and Drug Metabolism, National Institute on Drug Abuse, NIH, Baltimore, MD, USA.
authors.forename: Ariane
authors.initials: A
authors.lastname: Wohlfarth
authors.affiliation: Drug Testing and Program Policy, Office of the Under Secretary of Defense (Personnel and Readiness), Personnel Risk Reduction, Washington, DC, USA.
authors.forename: Kevin L
authors.initials: KL
authors.lastname: Klette
authors.affiliation: Drug Testing and Program Policy, Office of the Under Secretary of Defense (Personnel and Readiness), Personnel Risk Reduction, Washington, DC, USA.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Martin
authors.affiliation: Chemistry and Drug Metabolism, National Institute on Drug Abuse, NIH, Baltimore, MD, USA.
authors.forename: Marilyn A
authors.initials: MA
authors.lastname: Huestis
mesh_terms: D002186:Cannabinoids / Q000138:chemical synthesis / Q000378:metabolism / Q000652:urine*; D002853:Chromatography, Liquid; D006801:Humans; D007118:Immunoassay; D057230:Limit of Detection; D015813:Substance Abuse Detection / Q000379:methods*; D053719:Tandem Mass Spectrometry
chemical_list: D002186:Cannabinoids
keywords: LC-MS/MS; immunoassay; synthetic cannabinoids; urine drug testing