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A simple and sensitive analytical method for the quantitative determination of buspirone in rat plasma by HPLC with fluorescence detection was developed and validated using naproxen as an internal standard. A relatively small-volume (150 µL) aliquot of rat plasma sample was prepared by a simple deproteinization procedure using acetonitrile as a precipitating organic solvent. Chromatographic separation was performed using Kinetex ® C8 column with an isocratic mobile phase consisting of acetonitrile and 10-mM potassium phosphate buffer (pH 6.0) at a flow rate of 1.0 mL/min. The eluent was monitored by fluorescence detector at a wavelength pair of 237/380 nm (excitation/emission). The linearity was established at 20.0-5000 ng/mL, and the limit of detection was 6.51 ng/mL. The precision (≤14.6%), accuracy (89.2-108%), and stability (89.1-101%) were within acceptable ranges. The newly developed method was successfully applied to intravenous and oral pharmacokinetic studies of buspirone in rats.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Development of HPLC Method for the Determination of Buspirone in Rat Plasma Using Fluorescence Detection and Its Application to a Pharmacokinetic Study