Abstract
In this study, design of experiment approach was used for the development and optimization of a reversed phase HPLC method for the simultaneous determination of hydrochlorothiazide, amlodipine along with three angiotensin II receptor blockers olmesartan, losartan and valsartan in their laboratory-prepared mixtures and in three different commercial pharmaceutical single-pill combinations. The interactions between multiple chromatographic factors were studied using central composite design aiming to optimize both the resolution between the studied drugs and the run time. A total of 20 experiments were carried out and the coefficients of the second-order polynomial regression models were calculated to predict the optimal values of the HPLC method parameters. The significance of the models was evaluated by ANOVA, and the interactions between the three variables were illustrated by three-dimensional response surface plots. In this experimental design, the three studied key factors used for the optimization were A: pH, B: flow rate and C: acetonitrile (organic modifier) %. The five experimental responses observed were the four resolution factors and the run time. Obtained results were analyzed and the optimum chromatographic conditions predicted were 0.05 M potassium dihydrogen phosphate buffer (pH adjusted to 2.66 with ortho-phosphoric acid) and acetonitrile in the ratio (75.9:24.1, %v/v) as the mobile phase at flow rate 1.5 ml/min. Phenomenex Luna® 5 µm CN 100 Å LC column (250 × 4.6 mm) was used for the separation and quantification with photo diode array detection at 250 nm. Under these predicted optimum conditions, baseline separation with minimum resolution of 2.0 and run time less than 12 min were achieved, and the obtained experimental results showed good agreement with the predicted values. The optimized chromatographic separation was validated according to the International Conference on Harmonization guidelines to confirm linearity, specificity, accuracy, precision and robustness. The optimized RP-HPLC method has a wide range of application that can be used in quality control and routine analysis of the studied drugs in their different pharmaceutical single-pill combinations and laboratory mixtures aiming to reduce laboratory wastes, analysis time, cost and effort.
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Fouad, M.A., Elsabour, S.A., Elkady, E.F. et al. Design of experiment (DOE), multiple response optimization and utilizing the desirability function in the simultaneous HPLC separation of five antihypertensive drugs. J IRAN CHEM SOC 19, 269–282 (2022). https://doi.org/10.1007/s13738-021-02316-7
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DOI: https://doi.org/10.1007/s13738-021-02316-7