LAUSR

Methoxpropamine (MXPr) is an arylcyclohexylamine dissociative drug structurally similar to 3-methoxyeticyclidine, ketamine and deschloroketamine, recently appeared in the European illegal market and was classified within the New Psychoactive Substances (NPS). Our study investigated the metabolism of MXPr to elucidate the distribution of the parent drug and its metabolites in body fluids and fur of 16 mice. After the intraperitoneal administration of MXPr (1, 3, and 10 mg/kg), urine samples from 8 male and 8 female mice were collected every hour for 6 consecutive hours and then at 12-24 hours intervals. Additionally, plasma samples were collected 24 hours after MXPr (1 and 3 mg/kg) administration. Urine and plasma were diluted 1:3 with acetonitrile/methanol (95:5), and directly injected into the UHPLC-QTOF-HRMS system. The phase-I and II metabolites were preliminarily identified by means of the fragmentation patterns and the exact masses of both their precursor and fragment ions. Lastly, the mice fur was analyzed following an extraction procedure specific for the keratin matrix. Desmethyl-MXPr-glucoronide was identified in urine as the main metabolite, detected up to 24 hours after administration. The presence of NorMXPr in urine, plasma and fur was also relevant, following a N-dealkylation process of the parent drug. Other metabolites that were identified in fur and plasma included Desmethyl-MXPr and Dihydro-MXPr. Knowledge of the MXPr metabolites evolution is likely to support their introduction as target compounds in NPS toxicological screening analysis on real samples, both to confirm intake and extend the detection window of the dissociative drug MXPr in the biological matrices.