Development and validation of a rapid and specific rp- hplc method for simultaneous estimation of benazepril and hydrochlorothiazide in pure form and in their marketed pharmaceutical dosage form

Abstract

A new, simple, rapid and precise reverse phase high performance liquid chromatographic method has been developed for the validation of Benazepril and Hydrochlorothiazide in its pure form as well as in combined marketed formulation. Chromatography was carried out on a Phenomenex Luna C18 (4.6mm×250mm) 5µm particle size column using a mixture of Methanol: Phosphate Buffer (pH-4.2) (37:63% v/v) as the mobile phase at a flow rate of 1.0ml/min, the detection was carried out at 275nm. The retention time of the Benazepril and Hydrochlorothiazide was found to be was 2.133, 3.692±0.02min respectively. The method was validated according to ICH guidelines for linearity, sensitivity, accuracy, precision, specificity and robustness. The method produce linear responses in the concentration range of 20-60mg/ml of Benazepril and 10-30mg/ml of Hydrochlorothiazide. The inter-day and intra-day precisions were found to be within limits. The method precision for the determination of assay was below 2.0%RSD. The method is useful in the quality control of bulk and pharmaceutical formulations.