ESTIMATION OF MANIDIPINE DIHYDROCHLORIDE BY A NEW RP-HPLC METHOD

A rapid reverse phase high performance liquid chromatographic method was developed for the estimation of Manidipine dihydrochloride in its pure form as well as in tablet dosage forms. Chromatography was carried out on an phenomenex C18 column (250 4.6mm, 5 μm), using a mixture of acetonitrile and water (80: 20 v/v) with pH adjusted to 3.5 with ortho phosphoric acid (0.1 % v/v) as the mobile phase at a flow rate of 1.3 mL/min The detection wavelength is 230 nm. The retention time of the drug was 3.54 min. The method produced linear responses within concentration range of 25 to 125 μg/mL of Manidipine dihydrochloride. The method was found to be reproducible for analysis of the drug in tablet dosage forms.