Application of High Resolution Mass Spectrometry for the Screening and Confirmation of Novel Psychoactive Substances Joshua Zolton Seither [email protected]
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Florida International University FIU Digital Commons FIU Electronic Theses and Dissertations University Graduate School 4-25-2018 Application of High Resolution Mass Spectrometry for the Screening and Confirmation of Novel Psychoactive Substances Joshua Zolton Seither [email protected] DOI: 10.25148/etd.FIDC006565 Follow this and additional works at: https://digitalcommons.fiu.edu/etd Part of the Chemistry Commons Recommended Citation Seither, Joshua Zolton, "Application of High Resolution Mass Spectrometry for the Screening and Confirmation of Novel Psychoactive Substances" (2018). FIU Electronic Theses and Dissertations. 3823. https://digitalcommons.fiu.edu/etd/3823 This work is brought to you for free and open access by the University Graduate School at FIU Digital Commons. It has been accepted for inclusion in FIU Electronic Theses and Dissertations by an authorized administrator of FIU Digital Commons. For more information, please contact [email protected]. FLORIDA INTERNATIONAL UNIVERSITY Miami, Florida APPLICATION OF HIGH RESOLUTION MASS SPECTROMETRY FOR THE SCREENING AND CONFIRMATION OF NOVEL PSYCHOACTIVE SUBSTANCES A dissertation submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in CHEMISTRY by Joshua Zolton Seither 2018 To: Dean Michael R. Heithaus College of Arts, Sciences and Education This dissertation, written by Joshua Zolton Seither, and entitled Application of High- Resolution Mass Spectrometry for the Screening and Confirmation of Novel Psychoactive Substances, having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this dissertation and recommend that it be approved. _______________________________________ Piero Gardinali _______________________________________ Bruce McCord _______________________________________ DeEtta Mills _______________________________________ Stanislaw Wnuk _______________________________________ Anthony DeCaprio, Major Professor Date of Defense: April 25, 2018 The dissertation of Joshua Zolton Seither is approved. _______________________________________ De Dean Michael R. Heithaus College of Arts, College of Arts, Sciences and Education _______________________________________ Andrés G. Gil Vice President for Research and Economic Development and Dean of the University Graduate School Florida International University, 2018 ii © Copyright 2018 by Joshua Zolton Seither All rights reserved. iii ACKNOWLEDGMENTS First, I am grateful for the endless support and encouragement that I received from my family, especially from my wife, throughout this entire process. I would like to thank Dr. Anthony DeCaprio for serving as my advisor. I would like to thank Dr. Piero Gardinali, Dr. Bruce McCord, Dr. DeEtta Mills, and Dr. Stanislaw Wnuk for serving as committee members. I am appreciative for all of my fellow classmates, research group members, staff members, and friends from Florida International University that helped me along the way. I also would like to thank Dr. Lisa Reidy and the staff at the University of Miami toxicology laboratory for their support. iv ABSTRACT OF THE DISSERTATION APPLICATION OF HIGH RESOLUTION MASS SPECTROMETRY FOR THE SCREENING AND CONFIRMATION OF NOVEL PSYCHOACTIVE SUBSTANCES by Joshua Zolton Seither Florida International University, 2018 Miami, Florida Professor Anthony DeCaprio, Major Professor There has been an emergence of novel psychoactive substances (NPS) in forensic casework globally. Although the reported prevalence of these compounds has been relatively low in comparison to traditional drugs of abuse, published case studies suggest that some NPS have significant pharmacological effects that may cause severe impairment and/or death. Because of these effects, it is important that toxicology laboratories have the capability of identifying these compounds to complete a comprehensive toxicological analysis for human performance and post-mortem investigations. Recently, mass spectrometry has gained favor over traditional screening assays such as immunoassays for the identification of NPS in biological specimens. This trend is mainly a result of the fact that mass spectrometry provides the required sensitivity and selectivity for a broader range of analytes. High resolution tandem mass spectrometry has been suggested for analysis of NPS, as this technique further increases selectivity by increasing mass accuracy and providing MS/MS spectral data. The main goal of the present study was to investigate the applicability of using high resolution mass v spectrometry to screen for and confirm a large number of novel psychoactive substances. The present study consisted of three main tasks, which included 1) the creation of a large high resolution MS/MS spectral library and database, 2) the development of a solid phase extraction (SPE) method and acquisition methods, and 3) a collision induced dissociation (CID) study of regioisomeric NPS compounds. The MS/MS spectral library created contains spectral data for 252 NPS. In addition, 875 NPS entities were included in the compound database. The library and database can be used by toxicology laboratories to aid in the identification of NPS in casework using MS/MS spectral data and full scan MS data, respectively. The analytical method developed used SPE and high resolution mass spectrometry (HRMS). The HRMS method demonstrated limits of detection ranging from 0.5- 5 ng/mL for NPS from various structural drug classes. The CID experiments demonstrated that relative ion abundance alone could be used to differentiate some sets of regioisomers. The present work can aid toxicology laboratories in the identification of NPS and demonstrates the applicability of HRMS for their screening and confirmation. vi TABLE OF CONTENTS CHAPTER PAGE 1. INTRODUCTION .......................................................................................................... 1 2. LITERATURE REVIEW ............................................................................................... 3 2.1 Novel Psychoactive Substances Background ............................................................ 3 2.2 Novel Psychoactive Substance Classes ..................................................................... 5 2.2.1 Arylcyclohexylamines ........................................................................................ 6 2.2.2 Benzodiazepines ................................................................................................. 8 2.2.3 Cathinones ........................................................................................................ 10 2.2.4 Phenethylamines ............................................................................................... 11 2.2.5 Piperazines ........................................................................................................ 13 2.2.6 Synthetic Cannabinoids .................................................................................... 14 2.2.7 Synthetic Opioids ............................................................................................. 16 2.2.8 Tryptamines ...................................................................................................... 18 2.3 Identification of Drugs of Abuse and Novel Psychoactive Substances .................. 20 2.3.1 Routine Forensic Toxicological Analysis ......................................................... 20 2.3.2 Immunoassays .................................................................................................. 20 2.3.3 Sample Preparation ........................................................................................... 22 2.3.4 Instrumental Analysis ....................................................................................... 24 2.3.4.1 Gas Chromatography Mass Spectrometry ................................................ 24 2.3.4.2 Liquid Chromatography Mass Spectrometry ............................................ 26 2.3.4.3 High Resolution Mass Spectrometry ........................................................ 27 2.3.4.4 Collision Induced Dissociation ................................................................. 29 2.3.4.5 Mass Spectral Libraries............................................................................. 30 2.4 Regioisomers ........................................................................................................... 31 2.5 Challenges in Identifying Novel Psychoactive Substances..................................... 33 3. DEVELOPMENT OF A COMPOUND DATABASE AND HRMS SPECTRAL LIBRARY ......................................................................................................................... 36 3.1 Abstract ................................................................................................................. 36 3.2 Introduction ............................................................................................................. 37 3.3 Materials and Methods: ........................................................................................... 40 3.3.1 Chemicals and materials: .................................................................................. 40 3.3.2 Instrumentation and Software:.......................................................................... 40 3.3.3 Creation of the comprehensive compound database: ....................................... 41 3.3.4 Creation of the HRMS spectral library: ............................................................ 42 3.3.5 Analysis of blind