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 language | English (US) |
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Pages (from-to) | 897-907 |
Number of pages | 11 |
Journal | Journal of Pharmaceutical and Biomedical Analysis |
Volume | 23 |
Issue number | 5 |
DOIs | |
State | Published - Oct 2000 |
Externally published | Yes |
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