The method has mean recoveries in the range of 99.37% to 100.94% for all analytes. The method showed good linearity with correlation coefficients of 0.9998 and 1.0000 over the ranges of 5-25 ppm for BTM and 25-200 ppm for REA, respectively. The retention times of BTM and REA were found to be 1.90 and 3.70 minutes, respectively. The mobile phase was methanol-acetic acid 0.1% (85:15) with pH 5. All separations were performed with a Dionex 3000 Photodiode Array (PDA) detector on 240 nm and 340 nm wavelength, column temperature at 40oC, and flow rate at 1.0 ml/min. The mixture of betamethasone dipropionate (BTM) and retinoic acid (REA) was separated on Phenomenex Bonclone 10 C18 (150 mm x 3.9 mm) column. A simple, precise and rapid reverse phase UHPLC-PDA method has been developed and validated for the simultaneous analysis of betamethasone dipropionate (BTM) and retinoic acid (REA) in whitening cream dosage form.
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