Disposition of cannabinoids in oral fluid after controlled around-the-clock oral THC administration.
BACKGROUND
Oral fluid, a promising alternative matrix for drug monitoring in clinical and forensic investigations, offers noninvasive sample collection under direct observation. Cannabinoid distribution into oral fluid is complex and incompletely characterized due to the lack of controlled drug administration studies.


METHODS
To characterize cannabinoid disposition in oral fluid, we administered around-the-clock oral Delta(9)-tetrahydrocannabinol (THC) (Marinol) doses to 10 participants with current daily cannabis use. We obtained oral fluid samples (n=440) by use of Quantisal collection devices before, during, and after 37 20-mg THC doses over 9 days. Samples were extracted with multiple elution solvents from a single SPE column and analyzed by 2-dimensional GC-MS with electron-impact ionization for THC, 11-hydroxy-THC (11-OH-THC), cannabidiol, and cannabinol and negative chemical ionization for 11-nor-9-carboxy-THC (THCCOOH). Linear ranges were 0.5-50 microg/L, with the exception of cannabinol (1-50 microg/L) and THCCOOH (7.5-500 ng/L).


RESULTS
THCCOOH was the most prevalent analyte in 432 samples (98.2%), with concentrations up to 1117.9 ng/L. In contrast, 11-OH-THC was not identified in any sample; cannabidiol and cannabinol were quantified in 3 and 8 samples, respectively, with maximum concentrations of 2.1 and 13 microg/L. THC was present in only 20.7% of samples, with highest concentrations near admission (median 4.2 microg/L, range 0.6-481.9) from previously self-administered smoked cannabis.


CONCLUSIONS
Measurement of THCCOOH in OF not only identifies cannabis exposure, but also minimizes the possibility of passive inhalation. THCCOOH may be a better analyte for detection of cannabis use.
Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, NIH, Baltimore, MD 21224, USA.
Garry
G
Milman
Allan J
AJ
Barnes
David M
DM
Schwope
Eugene W
EW
Schwilke
William D
WD
Darwin
Robert S
RS
Goodwin
Deanna L
DL
Kelly
David A
DA
Gorelick
Marilyn A
MA
Huestis
D000293:Adolescent; D000328:Adult; D013759:Dronabinol / Q000032:analysis / Q000493:pharmacokinetics*; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000378:metabolism*; D012463:Saliva / Q000737:chemistry / Q000378:metabolism*; D015813:Substance Abuse Detection / Q000379:methods*; D013997:Time Factors; D055815:Young Adult
D013759:Dronabinol