Simultaneous selected reaction monitoring, MS/MS and MS3 quantitation for the analysis of pharmaceutical compounds in human plasma using chip‐based infusion

Abstract
An assay method with mass spectrometric detection was developed for the quantitative analysis of a pharmaceutical compound and its major metabolite in human plasma using chip‐based infusion. Liquid‐liquid extraction sample preparation was found to be essential to minimize matrix suppression and to achieve a limit of quantitation (LOQ) of 2.5 ng/mL using a 100 μL plasma aliquot. The potential for simultaneous quantitation in selected reaction monitoring (SRM), tandem mass spectrometry (MS/MS) (enhanced product ion), and MS3 was investigated and found to be very beneficial in improving assay selectivity. A novel concept for monitoring quantitative assay performance using a SRM/MS3 ratio is proposed. Copyright © 2004 John Wiley & Sons, Ltd.

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