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Identification of Major Metabolites in Human Blood and Urine Associated with the Ingestion of Alpha PVP
Melissa Friscia* MSFS, Sarah Wolf BS, Amanda LA Mohr MSFS, Francis X. Diamond BS, Jillian K Yeakel MSFS, Barry K Logan PhD DABFT
FSF Emerging Forensic Scientist Award
Oral Presentation
Disclaimer
The project was supported by Award No. 2013-DN-BX-K018, awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice. The opinions, findings, and conclusions or recommendations expressed in this publication/program/exhibition are those of the author(s) and do not necessarily reflect those of the Department of Justice.
Novel Psychoactive Substances
• Novel psychoactive substances (NPS) refers to a broad category of products containing unregulated phenethylamines, cathinones, and synthetic cannabinoids
• NPS market is in constant flux
– Limited ability to develop analytical methods in a timely fashion
– Limited research on metabolism
NPS Use at Electronic Dance Music Festivals
• U.S. Electronic Dance Music (EDM) is characterized by techno-rock music and rave culture
• Literature sources indicate as many as 70% of attendees may be using recreational drugs
• Users believe that they are using common club drugs like MDMA – Many participants are ingesting NPS drugs
– Increased potency leads to increased health concerns
Project Design and Objectives
• Collection and analysis of paired blood, urine, and oral fluid samples
• Project goals included:
– Characterize potential metabolites of alpha-PVP using in vitro studies with human liver microsomes (HLM)
– Evaluate the extent to which these metabolites are present in authentic blood and urine samples
Alpha-PVP
• Belongs to the “bath salts” group of substances
– PVP, O-2387, alpha
• Sold as tablets or as a powder to be taken orally, insufflated, or dissolved in solution to be injected
– Effects occur within 30 to 45 minutes of administration
• Seizures of “gravel” were reported in late 2013
α-Pyrrolidinopentiophenone
Human Liver Microsome Incubations
• Samples were prepared by adding: – 100 mM Phosphate Buffer (pH 7.4) with 10 mM MgCl2
– 5 µL of 1 mg/mL drug of interest – 50 µL of 10 mM NADPH – 25 µL of pooled human liver microsomes
• Samples were incubated in a water bath for 2 hours at 37⁰C
• Samples were analyzed on a Waters ACQUITY UPLC ® I Class coupled with a Waters Xevo ® G2-S QTOF – Using the Forensic Toxicology Screening Solution with
UNIFITM
Metabolite Name
1 Alpha-PVP
2 Amino-PVP
3 2”-oxo-PVP
4 OH-Alkyl-PVP
5,6 OH-Phenyl-Amino-PVP
7 OH-Phenyl-PVP
8 OH-Alkyl-oxo-PVP
9-11 Carboxy-oxo-PVP
12 OH-Phenyl-2”-oxo-PVP
13 di-OH-PVP
14 OH-Phenyl-Carboxy-
oxo-PVP
In silico and in vitro metabolism studies support identification of designer drugs in human urine by liquid chromatography/quadrupole-time-of-flight mass spectrometry Elli Tyrkkö, Anna Plander, Raimo A. Ketola
Metabolite Name
Parent Alpha-PVP
M1 5-OH-PVP
M2 OH-Alkyl-PVP
M3 2”-oxo-PVP
M4 Reduced 2”-oxo-PVP
M5 Amino-PVP
M6 Carboxyamino-PVP
M7 Carboxy-PVP
α
RESULTS
HLM Incubations
Alp
ha-P
VP
Binary Comparison in UNIFI®
Name: 2”-oxo-PVP MF: C15H19NO2
[M+H]+: 246.1489
Control Incubation
Alpha-PVP Incubation
2”-oxo-PVP in MSMS Mode
Carboxyamino-PVP
Alpha-PVPOH-Alkyl-PVP5-OH-PVP
2"-oxo-PVP
OH-Phenyl-PVP
Butylamino, OH-Alkyl-PVP
Amino-PVP
5-OH-PVP
• Reduction of the ketone to an alcohol
• Commercially available standard to confirm identification
5-OH-PVP
5-OH-PVP Standard
Sample MS075
5-OH-PVP
5-OH-PVP Standard at 4.78 minutes
Major Peak at 4.64 minutes
Minor Peak at 4.78 minutes
5-OH-PVP
Enantiomeric Pair Enantiomeric Pair
Diastereomers
• Collected samples from 145 subjects
– IRB Approved Study for Human Subjects
– 105 urine samples
• 13 alpha-PVP cases
– 65 blood samples
• 8 alpha-PVP cases
Samples from Human Subjects
Alpha-PVP Metabolites: Urine Samples (n=13)
0
2
4
6
8
10
12
14
Alpha PVP Metabolites: Blood Samples (n=8)
0
1
2
3
4
5
6
7
8
Conclusion
• 8 metabolites were identified using HLM incubations
• 6 metabolites had previously been reported in rat urine and human urine
– Determined two additional metabolites in human samples previously not detected • Positional isomer of OH-Phenyl-PVP
• Butylamino, OH-Alkyl-PVP
Primary Urine Metabolites Primary Blood Metabolites
• 5-OH-PVP • Butylamino,OH-Alkyl-PVP • 2”-oxo-PVP • OH-Alkyl-PVP
• 5-OH-PVP • 2”-oxo-PVP
Acknowledgements
• The National Institute of Justice
• Waters Corporation
– Michelle Wood, Jeff Goshawk, Jim Bulgarelli, Scott Freeto, Peter Harrsch, Will Harris
• AAFS Toxicology Section
FSF Emerging Forensic Scientist Award
Oral Presentation