Analysis of reboxtine, a novel antidepressant drug, in pharmaceutical tablets by capillary electrophoresis and derivative spectrophotometry

The recent antidepressant drug reboxetine was quantified in pharmaceutical tablets by derivative spectrophotometry and capillary zone electrophoresis. The feasible sample pretreatment consists of a single extraction with a pH 2.5 phosphate buffer, centrifugation and dilution. For the spectrophotometric assay, the fourth derivative of the absorbance was used which gave satisfactory results in terms of accuracy (mean recovery 99.7 %) and precision (mean RSD % 3.4 %). The electrophoretic experiments were carried out using the shortest effective length of the capillary (8.5 cm) in order to obtain a very rapid separation of reboxetine and dibenzepine used as the internal standard. using a pH 2.5, 50 mM phosphate buffer as the background electrolyte, each analysis lasted less than 2.5 min. Accuracy (101.3 %) and precision (1.%) were very good.