Sensitive high-performance liquid chromatographic method for a dopamine receptor agonist, CI-1007, and its metabolite PD 147693 in monkey plasma.

A sensitive gradient high-performance liquid chromatographic (HPLC) method for the simultaneous quantitation of a dopamine autoreceptor agonist CI-1007 (I) and its metabolite PD 147693 (II) is described. Monkey plasma samples were purified by liquid-liquid extraction using hexane. Liquid chromatographic separation was achieved on two C18 analytical columns (installed in series) using gradient elution. Column effluent was monitored using a fluorescence detector programmed to change wavelengths at specified times. Minimum quantitation limits of I and II were 3.0 and 5.0 ng/ml, respectively, for a plasma sample volume of 0.100 ml. Linearity was demonstrated up to 300 ng/ml. The assay has been applied to the analysis of I and II in plasma from monkeys following intravenous and oral doses of I.