Case report: relevance of metabolite identification to detect new synthetic opioid intoxications illustrated by u-47700 - Université de Lille Accéder directement au contenu
Article Dans Une Revue International journal of legal medicine Année : 2018

Case report: relevance of metabolite identification to detect new synthetic opioid intoxications illustrated by u-47700

Résumé

Today, new psychoactive substances (NPS) producers increasingly appear to be targeting new synthetic opioids (NSOs), and the recent emergence of NSOs is causing considerable concern in North America and in Europe. For toxicologists, NSO detection in a forensic context presents three additional difficulties to the general NPS analytical detection challenge: (i) high frequency of new products, (ii) low concentrations (in μg/L range and under) in biological samples related to their high opioid potency, and (iii) extensive metabolism. In this context, the present work aims to highlight the relevance of NSO metabolite detection in potential intoxication cases. Illustration is given with U-47700, an emerging NSO, (i) that was identified in a powder recently collected in France and in a fatality case, (ii) whose metabolites were in vitro produced using human liver microsomes and their mass spectra (MS) added in our MS/MS and HRMS libraries, and (iii) for which metabolism data were compared to those of the literature: U-47700 was identified in the powder and at 3040 μg/L in peripheral blood in the fatality case. In addition, high amounts of several U-47700 metabolites, especially N-desmethyl-U-47700, were observed in urine. Even if metabolite formation may largely depend on the enzymatic activity as well as on the length of the survival time, confrontation of these results to data found in the literature strongly suggests that this metabolite is regularly a better blood and (mainly) urine biomarker of U-47700 intake than U-47700 itself. Indeed, in this fatality and in other previous reports, N-desmethyl-U-47700 produced the main observed chromatographic signal (i) systematically in vitro and (ii) commonly in vivo, especially in urines. N,N-Didesmethyl-U-47700 is also sometimes a better biomarker of U-47700 intake than U-47700 itself. Accordingly, we suggest adding N-desmethyl-U-47700 (and N,N-didesmethyl-U-47700) in mass spectrum databases used for toxicological screening in order to reduce the risk of false-negative results in intoxication cases involving U-47700.
Fichier non déposé

Dates et versions

hal-04502279 , version 1 (13-03-2024)

Identifiants

Citer

Camille Richeval, Jean-Michel Gaulier, Ludovic Romeuf, Delphine Allorge, Yvan Gaillard. Case report: relevance of metabolite identification to detect new synthetic opioid intoxications illustrated by u-47700. International journal of legal medicine, 2018, International journal of legal medicine, 133, pp.133-142. ⟨10.1007/s00414-018-1969-3⟩. ⟨hal-04502279⟩

Collections

UNIV-LILLE
1 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More