Abstract:
A First order derivative spectroscopic method, and RP-HPLC method were developed
and validated for simultaneous estimation of Azilsartan medoxomil and Amlodipine
Besylate HCl in pharmaceutical dosage form. First order derivative method based on
the measurement of absorbance at two wavelengths, 248.66 nm and 228.16 nm, ZCP
of Azilsartan medoxomil and Amlodipine Besylate HCl respectively. The calibration
curve was linear in a concentration range of 12-28 μg/ml for Azilsartan medoxomil
and 3-7 μg/ml for Amlodipine Besylate HCl. The RP-HPLC method has shown
adequate separation of Azilsartan medoxomil and Amlodipine Besylate HCl in its
Dosage form. The separation was achieved on a Enable C18 H (250mm X 4.6 mm
i.d., 5 μm particle size) with an Isocratic system of Acetonitrile : Phosphate Buffer
(pH 3.8) in the ratio of 80:20 v/v at flow rate of 1.0 ml/min, Injection volume 20μl
and wavelength of detection used was 242 nm. The retention time for Azilsartan
medoxomil and Amlodipine Besylate HCl was obtained as 3.24±0.01min, and
6.18±0.01 min respectively. The linearity of the proposed method was investigated in the range of 12-52 μg/ml and 3-13μg/ml for Azilsartan medoxomil and Amlodipine
Besylate HCl. respectively. Correlation coefficient was 0.997 and 0.998 Azilsartan
medoxomil and Amlodipine Besylate HCl respectively. The developed method was
validated as per ICH guideline, for its accuracy, precision, LOD & LOQ and the
results were found to be satisfactory, thus the method is specific, rapid and simple for
estimation of Azilsartan medoxomil and Amlodipine Besylate HCl.
