Development and Validation of a Stability-Indicating Reversed-Phase Liquid Chromatographic Method for the...

Methylprednisolone aceponate (MPA) is a nonhalogenated, diester corticosteroid, specifically designed to treat eczema. The amount of benzyl alcohol (BA), an excipient, is quite high in the cream formulation of MPA; therefore, the simultaneous determination of MPA, active ingredient, and BA is important. Chromatographic analysis was performed on an Agilent Poroshell 120 EC-C18 (100 × 2.1 mm 2.7 μm) column using acetonitrile-water (40:60, v/v) mixture as mobile phase with isocratic elution. The diode array detector (DAD) was set at 245 and 258 nm. The column was thermostated at 40°C ± 1°C. A flow rate of 0.5 mL/min was used to elute the analyte from the column. The calibration curve was linear in the concentration range 0.17-4.20 μg/mL for MPA and 1.50-35.0 μg/mL for BA. The R² values for MPA and BA were found to be 0.9989 and 0.9999, respectively. The limit of detection was found to be 0.048 μg/mL for MPA, 0.46 μg/mL for BA, and the limit of quantification was found to be 0.17 μg/mL for MPA and 1.50 μg/mL for BA. MPA was exposed to stress conditions, and the stressed samples were analyzed using the proposed method, which can effectively separate MPA from its degradation products.