title: Gas chromatography/mass spectrometry analysis of the six-ring regioisomeric dimethoxybenzyl-N-methylpiperazines (DMBMPs).
abstract: BACKGROUND
  Piperazine-based designer drugs represent a novel class of substances found in illicit drug samples in the US and abroad. The clandestine production of these substances often makes use of piperazine as a key commercially available precursor substance. The commercial availability of 1-methylpiperazine suggests additional designer modification based on this additional precursor material.
  
  
  METHODS
  This study focuses on the electron ionization mass spectrometric (EI-MS) fragmentation of the dimethoxybenzyl-N-methylpiperazines as potential designer modifications of the general benzylpiperazine drug skeleton and explores the gas chromatography (GC)/MS properties of all six of these regioisomeric substances.
  
  
  RESULTS
  Fragmentation of the bond between the benzylic carbon and the adjacent piperazine nitrogen provides the base peak in all six spectra. The internal fragmentation within the piperazine ring produces a number of unique ions in the mass spectra of these dimethoxybenzyl-N-methylpiperazines. The migration of methyl groups from nitrogen and oxygen were confirmed by deuterium-labeling experiments.
  
  
  CONCLUSIONS
  The six regioisomeric dimethoxybenzyl-N-methylpiperazines yield equivalent fragment ions and deuterium labeling confirmed the elemental composition of the characteristic fragments in their mass spectra. Mixtures of the dimethoxybenzyl-N-methylpiperazines were successfully resolved via capillary gas chromatography using a relatively polar stationary phase and temperature-programming conditions. Copyright © 2013 John Wiley & Sons, Ltd.
authors.affiliation: Department of Pharmacal Sciences, Harrison School of Pharmacy, Auburn University, Auburn, AL, 36849, USA; Dept. of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Alexandria University, Alexandria, 21521, Egypt.
authors.forename: Karim M
authors.initials: KM
authors.lastname: Abdel-Hay
authors.forename: Jack
authors.initials: J
authors.lastname: Deruiter
authors.forename: C Randall
authors.initials: CR
authors.lastname: Clark