Abstract
3,4-Methylenedioxymethamphetamine (MDMA) is an illicit phenethylamine ingested for entactogenic and euphoric effects. Although blood is more commonly submitted for forensic analysis, previous human MDMA pharmacokinetics research focused on plasma data; no direct blood–plasma comparisons were drawn. Blood and plasma specimens from 50 healthy adult volunteers (33 males, 17 females, 36 African-American) who ingested recreational 1.0 and 1.6 mg/kg MDMA doses were quantified for MDMA and metabolites 4-hydroxy-3-methoxymethamphetamine (HMMA), 3,4-methylenedioxyamphetamine (MDA), and 4-hydroxy-3-methoxyamphetamine (HMA) by two-dimensional gas chromatography–mass spectrometry. Specimens were collected up to 3 h post-dose and evaluated for maximum concentration (C max), first detection time (t first), time of C max (t max), and 3-h area under the curve (AUC0–3 h); as well as blood metabolite ratios and blood/plasma ratios. Median blood MDMA and MDA C max were significantly greater (p < 0.0005) than in plasma, but HMMA was significantly less (p < 0.0005). HMA was detected in few blood specimens, at low concentrations. Nonlinear pharmacokinetics were not observed for MDMA or MDA in this absorptive phase, but HMMA C max and AUC0–3 h were similar for both doses despite the 1.6-fold dose difference. Blood MDA/MDMA and MDA/HMMA significantly increased (p < 0.0001) over the 3-h time course, and HMMA/MDMA significantly decreased (p < 0.0001). Blood MDMA C max was significantly greater in females (p = 0.010) after the low dose only. Low-dose HMMA AUC0–3 h was significantly decreased in females’ blood and plasma (p = 0.027) and in African-Americans’ plasma (p = 0.035). These data provide valuable insight into MDMA blood–plasma relationships for forensic interpretation and evidence of sex- and race-based differential metabolism and risk profiles.
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Acknowledgments
We thank the National Institute on Drug Abuse Intramural Research Program and Johns Hopkins Bayview Medical Center Behavioral Pharmacology Research Unit clinical staff. We further acknowledge the Graduate Partnership Program, National Institutes of Health. This research was funded by the Intramural Research Program, National Institute on Drug Abuse, NIH.
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Hartman, R.L., Desrosiers, N.A., Barnes, A.J. et al. 3,4-Methylenedioxymethamphetamine (MDMA) and metabolites disposition in blood and plasma following controlled oral administration. Anal Bioanal Chem 406, 587–599 (2014). https://doi.org/10.1007/s00216-013-7468-y
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DOI: https://doi.org/10.1007/s00216-013-7468-y