Direct determination of ecgonine methyl ester and cocaine in rat plasma, utilizing on-line sample extraction coupled with rapid chromatography/quadrupole orthogonal acceleration time-of-flight detection

Patrick M. Jeanville, James H. Woods, Theodore J. Baird, Estela S. Estapé

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Our current experiments assess the applicability of on-line sample extraction with coupled rapid chromatography systems to quadrupole orthogonal acceleration time-of-flight (Q-TOF) detection for the quantitative analysis of cocaine (COC), and ecgonine methyl ester (EME) in rat plasma. Experiments were performed on a Q-TOF instrument, operated in the MS/MS mode. Quantitation was achieved utilizing the most prominent parent-daughter transition and internal standard calibration techniques (COC-d3: IS). The calibration curves produced for EME and COC ranged from 5.0 to 10 000 and 0.5 to 10 000 ng/ml, respectively. Equations of regression line and correlation coefficients for the pseudo-multiple reaction monitoring (MRM) ion abundance ratio and the corresponding calibration concentrations (r2) were as follows: y = 0.0003 + 0.0703 x (r2 = 0.9921) for EME and y = 0.0032 + 0.0035 x (r2 = 0.9997) for COC. The system repeatability, given as percent coefficient of variation (% CV) of mean peak-area ratios, was assessed using 50 injections of a rat plasma sample from the pharmacokinetic study. The analyses were performed over the course of 5 days, rendering % CVs for EME and COC of 0.73 and 0.58, respectively. This method suggests that on-line sample extraction coupled with fast liquid chromatography/quadrupole orthogonal time-of-flight mass spectrometry may be a viable alternative for quantitative analysis of EME and COC in rat plasma. (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)897-907
Number of pages11
JournalJournal of Pharmaceutical and Biomedical Analysis
Volume23
Issue number5
DOIs
StatePublished - Oct 2000
Externally publishedYes

Keywords

  • Cocaine and ecgonine methyl ester analysis
  • HPLC/(Q-TOF)
  • On-line sample extraction

ASJC Scopus subject areas

  • Analytical Chemistry
  • Pharmaceutical Science
  • Drug Discovery
  • Spectroscopy
  • Clinical Biochemistry

Fingerprint Dive into the research topics of 'Direct determination of ecgonine methyl ester and cocaine in rat plasma, utilizing on-line sample extraction coupled with rapid chromatography/quadrupole orthogonal acceleration time-of-flight detection'. Together they form a unique fingerprint.

  • Cite this