This timely reference discusses mass spectrometry in drug metabolism and pharmacokinetic studies. With contributions by professionals from the pharmaceutical industry, this book begins with a review of current mass spectrometry techniques and applications, followed by discussions of various methods for using MS in drug metabolism studies and pharmacokinetics. Highlighting the critical importance of ADME studies for understanding how a drug is absorbed, distributed, metabolized, and excreted by the body, the book s focuses on the use of LC/MS and MALDI-MS. This is a valuable reference for scientists in the pharmaceutical industry, medicine, academia, and even those working in homeland defense.

Preface vii

About the Editor ix

Contributors xi

1. Evolving Role of Mass Spectrometry in Drug Discovery and Development 1
Dil M. Ramanathan and Richard M. LeLacheur

2. Quantitative Bioanalysis in Drug Discovery and Development: Principles and Applications 87
Ayman El-Kattan, Chris Holliman, and Lucinda H. Cohen

3. Quadrupole, Triple-Quadrupole, and Hybrid Linear Ion Trap Mass Spectrometers for Metabolite Analysis 123
Elliott B. Jones

4. Applications of Quadrupole Time-of-Flight Mass Spectrometry in Reactive Metabolite Screening 159
Jose M. Castro-Perez

5. Changing Role of FTMS in Drug Metabolism 191
Petia A. Shipkova, Jonathan L. Josephs, and Mark Sanders

6. High-Resolution LC–MS-Based Mass Defect Filter Approach: Basic Concept and Application in Metabolite Detection 223
Haiying Zhang, Donglu Zhang, Mingshe Zhu, and Kenneth L. Ray

7. Applications of High-Sensitivity Mass Spectrometry and Radioactivity Detection Techniques in Drug Metabolism Studies 253
Wing W. Lam, Cho-Ming Loi, Angus Nedderman, and Don Walker

8. Online Electrochemical–LC–MS Techniques for Profiling and Characterizing Metabolites and Degradants 275
Paul H. Gamache, David F. Meyer, Michael C. Granger, and Ian N. Acworth

9. LC–MS Methods with Hydrogen/Deuterium Exchange for Identification of Hydroxylamine, N-Oxide, and Hydroxylated Analogs of Desloratadine 295
Natalia A. Penner, Joanna Zgoda-Pols, Ragu Ramanathan, Swapan K. Chowdhury, and Kevin B. Alton

10. Turbulent-Flow LC–MS: Applications for Accelerating Pharmacokinetic Profiling and Metabolite Identification 311
Joseph L. Herman and Joseph M. Di Bussolo

11. Desorption Ionization Techniques for Quantitative Analysis of Drug Molecules 341
Jason S. Gobey, John Janiszewski, and Mark J. Cole

12. MALDI Imaging Mass Spectrometry for Direct Tissue Analysis of Pharmaceuticals 359
Yunsheng Hsieh and Walter A. Korfmacher

Index 383

Ragu Ramanathan received a B.Sc. in Chemistry from the University of Southern Mississippi and a Ph.D. in Physical Chemistry/Mass Spectrometry from the University of Florida. His graduate research focused on coupling of electrospray ionization (ESI) to Fourier transform ion cyclotron resonance (FTICR) mass spectrometer. After spending three years as a postdoctoral research fellow with Professor Michael L. Gross at the Washington University, St. Louis, Missouri, Dr. Ramanathan managed the Center for Advanced Mass Spectrometry at the Analytical Bio-Chemistry Laboratories, Columbia, Missouri. In 1998, Dr. Ramanathan joined Schering-Plough Research Institute’s (SPRI) Drug Metabolism and Pharmacokinetics (DMPK) Department and completed his tenure as a senior principal scientist in 2008. While at SPRI, Dr. Ramanathan was involved in the application of LC–MS for profiling and characterization of metabolites of drug candidates in the preclinical development and clinical stages. Dr. Ramanathan was with Pfizer Global Research and Development from 1999 to 2002 as a group leader of the Ann