Determination of benperidol in human plasma by high-performance liquid chromatography

Derivative spectrophotometric determination of droperidol in presence of parabens

We have developed a fast and accurate method for the determination of droperidol in the presence of methylparaben and propylparaben using derivative spectrophotometry. The first derivative amplitudes at 255.2 nm were selected for the assay. Calibration graph follows Beer's law in the range of 5-35 microg ml(-1). The coefficient of variation (CV) for intra-day and inter-day precision were less than 1.0 and 2.0%, respectively. The method was applied in the quality control of commercial oral and injection solutions and proved to be suitable for routine analysis.

LC determination and degradation study of droperidol

A specific, high performance liquid chromatographic method for the determination of droperidol in the presence of its degradation products is described. The method is based on the use of an amide functionalized bonded phase column (LC-ABZ(+) Plus) and a simple mobile phase of methanol-sodium phosphate monobasic (0.05 M, pH 4.5) (40:60, v/v). It enables the resolution of eight compounds from the parent drug and from each other. The degradation was carried out in hydrochloric acid, sodium hydroxide and hydrogen peroxide. The main degradation products were identified. Application of the assay for a commercial preparation of droperidol for injection is presented.

Determination of benperidol and its reduced metabolite in human plasma by high-performance liquid chromatography and electrochemical detection

An isocratic high-performance liquid chromatographic method with electrochemical detection for the quantification of benperidol and its suggested reduced metabolite TVX Q 5402 in human plasma is described. The method included a two-step solid-phase extraction on reversed-phase and cation-exchange material, followed by separation on a cyanopropyl silica gel column (5 microns; 250 mm x 4.6 mm I.D.). The eluent was 0.15 M acetate buffer (pH 4.7) containing 25% acetonitrile (w/w). Spiperone served as internal standard. The inclusion of the cation-exchange step provided sample purity higher than those achieved with other methods. After extraction of 1 ml of plasma, concentrations as low as 0.5 ng/ml were detectable for both benperidol and the metabolite. In plasma samples collected from a schizophrenic patient treated with a single oral dose of 6 mg of benperidol, plasma levels of benperidol and of the metabolite could be measured from 20 min to at least 12 h after administration.