Abstract
Analyte stability is an important factor in urine test interpretation, yet cannabinoid stability data are limited. A comprehensive study of Δ9-tetrahydrocannabinol (THC), 11-hydroxy-THC (11-OH-THC), 11-nor-9-carboxy-THC (THCCOOH), cannabidiol, cannabinol, THC-glucuronide, and THCCOOH-glucuronide stabilities in authentic urine was completed. Urine samples after ad libitum cannabis smoking were pooled to prepare low and high pools for each study participant; baseline concentrations were measured within 24 h at room temperature (RT), 4 °C and -20 °C. Stability at RT, 4 °C and −20 °C was evaluated by Friedman tests for up to 1 year. THCCOOH, THC-glucuronide, and THCCOOH-glucuronide were quantified in baseline pools. RT THCCOOH baseline concentrations were significantly higher than −20 °C, but not 4 °C baseline concentrations. After 1 week at RT, THCCOOH increased, THCCOOH-glucuronide decreased, but THC-glucuronide was unchanged. In RT low pool, total THCCOOH (THCCOOH + THCCOOH-glucuronide) was significantly lower after 1 week. At 4 °C, THCCOOH was stable 2 weeks, THCCOOH-glucuronide 1 month and THC-glucuronide for at least 6 months. THCCOOH was stable frozen for 1 year, but 6 months high pool results were significantly higher than baseline; THC-glucuronide and THCCOOH-glucuronide were stable for 6 months. Total THCCOOH was stable 6 months at 4 °C, and frozen 6 months (low) and 1 year (high). THC, cannabidiol and cannabinol were never detected in urine; although not detected initially, 11-OH-THC was detected in 2 low and 3 high pools after 1 week at RT. Substantial THCCOOH-glucuronide deconjugation was observed at RT and 4 °C. Analysis should be conducted within 3 months if non-hydrolyzed THCCOOH or THCCOOH-glucuronide quantification is required.
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Acknowledgments
We acknowledge the contributions of the clinical staffs of the National Institute on Drug Abuse, Intramural Research Program, and Behavioral Pharmacology Research Unit and Clinical Research Unit, Johns Hopkins Bayview Medical Center, as well as Dr. David M. Schwope for protocol assistance, Dan Nichols and the staff at the Forensic Toxicology Drug Testing Laboratory in Fort Meade who provided urine creatinine data, the Graduate Partnership Program, NIH and the “Fondation Baxter et Alma Ricard”. This research was funded by the Intramural Research Program, National Institute on Drug Abuse, NIH.
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Desrosiers, N.A., Lee, D., Scheidweiler, K.B. et al. In vitro stability of free and glucuronidated cannabinoids in urine following controlled smoked cannabis. Anal Bioanal Chem 406, 785–792 (2014). https://doi.org/10.1007/s00216-013-7524-7
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DOI: https://doi.org/10.1007/s00216-013-7524-7