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.2021 Nov 1;67(11):1534-1544.
doi: 10.1093/clinchem/hvab134.

Urinary Metabolite Biomarkers for the Detection of Synthetic Cannabinoid ADB-BUTINACA Abuse

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Urinary Metabolite Biomarkers for the Detection of Synthetic Cannabinoid ADB-BUTINACA Abuse

Chi Hon Sia et al. Clin Chem..

Abstract

Background: (S)-N-(1-amino-3,3-dimethyl-1-oxobutan-2-yl)-1-butyl-1H-indazole-3carboxamide (ADB-BUTINACA) is an emerging synthetic cannabinoid that was first identified in Europe in 2019 and entered Singapore's drug scene in January 2020. Due to the unavailable toxicological and metabolic data, there is a need to establish urinary metabolite biomarkers for detection of ADB-BUTINACA consumption and elucidate its biotransformation pathways for rationalizing its toxicological implications.

Methods: We characterized the metabolites of ADB-BUTINACA in human liver microsomes using liquid chromatography Orbitrap mass spectrometry analysis. Enzyme-specific inhibitors and recombinant enzymes were adopted for the reaction phenotyping of ADB-BUTINACA. We further used recombinant enzymes to generate a pool of key metabolites in situ and determined their metabolic stability. By coupling in vitro metabolism and authentic urine analyses, a panel of urinary metabolite biomarkers of ADB-BUTINACA was curated.

Results: Fifteen metabolites of ADB-BUTINACA were identified with key biotransformations being hydroxylation, N-debutylation, dihydrodiol formation, and oxidative deamination. Reaction phenotyping established that ADB-BUTINACA was rapidly eliminated via CYP2C19-, CYP3A4-, and CYP3A5-mediated metabolism. Three major monohydroxylated metabolites (M6, M12, and M14) were generated in situ, which demonstrated greater metabolic stability compared to ADB-BUTINACA. Coupling metabolite profiling with urinary analysis, we identified four urinary biomarker metabolites of ADB-BUTINACA: 3 hydroxylated metabolites (M6, M11, and M14) and 1 oxidative deaminated metabolite (M15).

Conclusions: Our data support a panel of four urinary metabolite biomarkers for diagnosing the consumption of ADB-BUTINACA.

Keywords: ADB-BUTINACA; metabolic reaction phenotyping; metabolite profiling; synthetic cannabinoid; urinary biomarker.

© American Association for Clinical Chemistry 2021. All rights reserved. For permissions, please email: journals.permissions@oup.com.

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