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As part of this study, a new sensitive, convenient, accurate and robust reversed-phase high-performance liquid chromatography (RP-HPLC) method for the determination of azelidipine in pharmaceutical and tablet formulations was developed and validated. The three variables chosen were methanol concentration, flow rate, and pH in the mobile phase. Separation was performed using an HPLC method with a UV detector and a Chromosil C18 (250mm x 450mm). Methanol was pumped at a flow rate of 1.0mL/min and adjusted to pH 4.0 with dilute OPA (60:40% v/v) and pH 4.0 with potassium dihydrogen phosphate buffer (pH 4.0), 255nm.
Latha et al. (Wed,) studied this question.