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Direct plasma injection for high-performance liquid chromatographic-mass spectrometric quantitation of the anxiolytic
S R Needham1, M J Cole, H G Fouda
1Department of Drug Metabolism, Central Research Division, Pfizer Inc, Groton, CT 06340, USA.
Abstract:
A direct plasma injection method has been developed for the rapid analysis of drugs in biological fluids. A new generation restricted access media column specifically designed to accommodate direct injection of plasma and other fluids is utilized for on-line HPLC-ESI-MS analysis. For rapid analysis the on-line extraction column is linked to a HPLC-ESI-MS system. Good results are obtained for the quantitation of CP-93 393 and deuterated internal standard over the range of 10-1000 ng/ml. The lower limit of detection for the assay was 58 pg injected on column. Accuracy and precision values are 9.0% or better over the entire range of the assay. In addition, more than 200 injections (100 microl) were performed per column with unattended, automated analysis.