Method Development and Validation for Simultaneous Estimation of Benidipine Hydrochloride and Metoprolol Succinate in Tablet

Present work focusing in developing and validating a new high performance liquid chromatography method for estimation of Metoprolol Succinate and Benidipine Hydrochloride in their combine tablet dosage form. The method was performed on Shimadzu LC-20AT instrument using C18 (250 mm x 4.6 mm, 5 µm) Hypersil BDS Column and Potassium Dihydrogen Phosphate Buffer (pH 4.0): Methanol (65: 35% v/v) as mobile phase at ambient temperature. Detection was carried out at 269 nm. Concentration range 4-12 µg/ml for Benidipine Hydrochloride and 25-75 µg/ml for Metoprolol Succinate . The Percentage recovery of Benidipine Hydrochloride and Metoprrolol succinate was found to be 99.59% and 99.39 respectively. Correlation coefficient for Metoprolol succinate and Benidipine Hydrochloride was found 0.9995 and 0.9997 respectively. The Rt values for Metoprolol succinate and Benidipine Hydrochloride were found to be 3.4 and 5.9 min respectively. The method was validated according to the guidelines of International Conference on Harmonisation (ICH) and was successfully employed in the estimation of commercial formulations. Keywords:  Metoprolol Succinate, Benidipine Hydrochoride, HPLC, Mobile Phase