Stability-indicating comparative methods using MEKC and LC for determination of olmesartan medoxomil

摘要

A stability-indicating method using MEKC was validated for the analysis of olmesartan medoxomil in tablets. Successful separation was achieved using a fused silica capillary (40 cm x 50 μm i.d.); background electrolyte consisted of a combination of 10 mmol L~(-1) borate buffer and 5 mmol L ~(-1) anionic detergent sodium dodecyl sulfate (95:5; v/v) pH 6.5; hydrodynamic mode at 50 mBar for 5 s; 25 kV separation voltage at 25 °C; and column temperature 25 °C with detection at 257 nm. The proposed method, validated following ICH guidelines, was applied to the determination of this antihypertensive with good results compared with an LC method.