A QbD Assisted Bioanalytical Method Development and Validation for Simultaneous Estimation of Montelukast and Bilastine by LC-MS Technique

This study describes how to use internal standards (IS) under the Analytical Quality by Design (AQbD) methodology to measure montelukast and bilastine in artificial rabbit plasma. The protein precipitation method was used for sample preparation and extraction. The chromatographic analysis was performed on the processed materials. The measurement range of the calibration was between 2 to 40 ng/mL for Bilastine and 1 to 20 ng/mL for montelukast. Optimizing mobile phase composition, flow rate, and pH were used to determine peak area and retention time. A significant reduction in method variability was observed as a result of the method of experimental design during optimization, and this enhanced the stability of the technique. A validation study demonstrated linearity, accuracy, precision, selectivity, sensitivity, and stability for estimating bilastine and montelukast in rabbit plasma using the developed method. The chemical composition of the drug was not altered during tests on its stability in human plasma. Overall, the investigations showed that the established approach is straightforward, reliable, and affordable for use in regular pharmacokinetic and bioequivalence research.