Published: Journal of Analytical Toxicology, Volume 23, Number 7, Nov/Dec 1999, pp. 620-624
Determination of Opiates and Cocaine and Its Metabolites
in Biological Fluids by High-Performance Liquid Chromatography with Electrospray
Tandem Mass Spectrometry
A rapid, sensitive, and specific method for the determination of opiates and cocaine and metabolites in urine, plasma, and blood was established. A one-step extraction followed by liquid chromatography–electrospray ionization tandem mass spectrometry operating in multiple reaction monitoring mode was used. Two chromatographic runs were performed, each in less than 6 min. The lower limit for accurate quantitative determination was 5 µg/L for cocaine and metabolites and 10 µg/L for opiates. Linearity was obtained from 10 to 1000 µg/L. Intraday (n = 6) and interday (n = 6) precisions and recoveries (n = 6) were determined at 10 or 25, 100, and 1000 µg/L concentrations. Precisions with a coefficient of variation less than 15% were obtained. Recoveries between 85 and 115% were determined.
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