EVALUATION OF CAPILLARY SUPERCRITICAL-FLUID CHROMATOGRAPHY WITH MASS-SPECTROMETRIC DETECTION FOR THE ANALYSIS OF A DRUG (MEBEVERINE) IN A DOG PLASMA MATRIX

Supercritical fluid chromatography with mass spectrometric detection w as evaluated as a technique for the analysis of drugs in biological fl uids. Dog plasma was spiked with a model drug, mebeverine, and with a deuterium-labeled analog of mebeverine. The spiked plasma was prepared for analysis by solid-phase extraction on octadecylsilane cartridges. Mebeverine levels in the spiked dog plasma samples were determined by interpolation from a standard curve. Accuracy and precision of the an alysis were determined within and between days. In general, accuracy w as found to be 100 +/- 15% for plasma samples spiked with 6 to 60 ng m ebeverine/ml. The relative standard deviation for replicate sample ana lysis over this concentration range was between 5 and 12.5%.