Development and validation of a stability-indicating RP-HPLC method of cholecalciferol in bulk and pharmaceutical formulations: Analytical quality by design approach

The present article utilized analytical quality by design (AQbD) methodology to optimize chromatographic conditionsfor the routine analysis of Cholecalciferol (CHL). Taguchi orthogonal array design and Box–Behnken designwere employed to screen and optimize critical method parameters for augmenting the method performance. Theoptimal chromatographic separation was attained on Eurosphere® 100-5, C8 (250 × 4.6 mm i.d., 5 μm) column in anisocratic elution mode using methanol:acetonitrile (50:50, % v/v) as mobile phase at a flow rate of 1.0 ml/minutesand photodiode array detection at 265 nm. The optimized chromatographic method was successfully validated asper International Council for Harmonisation Q2 (R1) guidelines. The method was found to be linear (r2 = 0.9993)in the range of 20–100 IU/ml. Limit of detection and limit of quantitation were found to be 10 and 20 IU/ml. Theprecision, robustness, and ruggedness values were within the acceptance limits (relative standard deviation < 2). Thepercent recovery of in-house developed 400 IU mouth dissolving tablets and marketed Tayo 60k tablets were foundto be 99.89% and 101.46%, respectively. The forced degradation products were well resolved from the main peaksuggesting the stability-indicating the power of the method. In conclusion, the AQbD-driven method is highly suitablefor analysis of CHL in bulk and pharmaceutical formulations