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Nitazene Identification, Naming, and Metabolism: Resources for the Lab Wall Poster

Article from 2025-05-21

Discover additional resources to advance research and identification of nitazenes and other novel psychoactive substances (NPS).

Featured Nitazene Resources

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To cite this poster: St. Germaine, D.M., Layle N.K., Pierzynski, H., and Iula, D.M. Laboratory Guide for Nitazene Identification, Naming, and Metabolism. May 2025.

Featured NPS Resources

References Used to Compile Nitazene Lab Wall Poster

EI-MS:

1. Hardwick, E.K. and Davidson, T.J. Structural characterization of nitazene analogs using electron ionization-mass spectrometry (EI-MS). Forensic Chem. 40, 100605 (2024).

2. Weissberg, A., Madmon, M., and Dagan, S. Structural identification of compounds containing tertiary amine side chains using ESI-MS3 combined with fragmentation pattern matching to chemical analogues − benzimidazole derivatives as a case study. Int. J. Mass Spectrom. 394, 9-21 (2016).

3. Vandeputte, M.M., Van Uytfanghe, K., Layle, N.K., et al. Synthesis, chemical characterization, and μ-opioid receptor activity assessment of the emerging group of "nitazene" 2-benzylbenzimidazole synthetic opioids. ACS Chem. Neurosci. 12(7), 1241-1251 (2021).

4. Mueller, F., Bogdal, C., Pfeiffer, B., et al. Isotonitazene: Fatal intoxication in three cases involving this unreported novel psychoactive substance in Switzerland. Forensic Sci. Int. 320, 110686 (2021).

Metabolism:

3. Vandeputte, M.M., Van Uytfanghe, K., Layle, N.K., et al. Synthesis, chemical characterization, and μ-opioid receptor activity assessment of the emerging group of "nitazene" 2-benzylbenzimidazole synthetic opioids. ACS Chem. Neurosci. 12(7), 1241-1251 (2021).

5. Kanamori, T., Okada, Y., Segawa, H., et al. Metabolism of highly potent synthetic opioid nitazene analogs: N-Ethyl-N-(1-glucuronyloxyethyl) metabolite formation and degradation to N-desethyl metabolites during enzymatic hydrolysis. Drug Test. Anal. 17(2), 238-249 (2025).

4. Mueller, F., Bogdal, C., Pfeiffer, B., et al. Isotonitazene: Fatal intoxication in three cases involving this unreported novel psychoactive substance in Switzerland. Forensic Sci. Int. 320, 110686 (2021).

6. Taoussi, O., Berardinelli, D., Zaami, S., et al. Human metabolism of four synthetic benzimidazole opioids: Isotonitazene, metonitazene, etodesnitazene, and metodesnitazene. Arch. Toxicol. 98(7), 2101-2116 (2024).

7. Krotulski, A.J., Papsun, D.M., Kacinko, S.L., et al. Isotonitazene quantitation and metabolite discovery in authentic forensic casework. J. Anal. Toxicol. 44(6), 521-530 (2020).

8. Jadhav, G.R. and Fasinu, P.S. Metabolic characterization of the new benzimidazole synthetic opioids - nitazenes. Front. Pharmacol. 15, 1434573 (2024).

Nomenclature:

9. Stang, B.N., Denn, M.T., Logan, B.K., et al. NPS Opioid Naming Guide. In: cfsre.org [Internet]. (2024) Available from: https://www.cfsre.org/images/toolkits/CFSRE_NPSD_NPS_Opioid_Naming_Guide_December_2024.pdf


Nitazene Reference Standards


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Featured Resources for NPS Identification

NPS Dashboard


We keep up-to-date on the CFSRE's Quarterly Scope Recommendations. In our NPS dashboard, we align CFSRE recommendations with reference standards available from Cayman to help analysts easily find reference standards to fit their scope of testing.

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Lab Wall Posters


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Mass Spec Resources

Cayman Spectral Library


Our spectral library is a free-of-charge, searchable GC-MS spectral database containing 70eV EI MS data of hundreds of Cayman's emerging forensic drug standards.

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GC-MS Drug Identification Tool


Identify unknown substances in GC-MS analyses by searching formula weight, base peak, or 2nd base peak ion.

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