Fanse, et al.: Stability-indicating HPLC Method for Aspirin and LansoprazoleIn the present study a quality by design acquiescent method utilizing design of experiment and method operable design regions methodology was evaluated for optimization of chromatographic condition for separation of ten degradation products along with peaks of aspirin and lansoprazole. Box-Behnken design was exploited to evaluate the main and interaction effects of the selected critical process parameters on the critical quality attributes, viz resolution between the peak pairs and retention time of last eluting peak. The optimal separation was predicted at pH 3.6, with a gradient starting at 20% of acetonitrile and initial hold time of 10 min. The results of experimental methods show excellent agreement with predicted results, highlighting the importance of design of experiments in method optimization. The selected working condition was then fully validated according to International Conference on Harmonisation guidelines for linearity, range, accuracy, precision and robustness.
A simple, sensitive and feasible Quality by design based RP-HPLC bioanalytical method was developed and validated for Edaravone. Plackett burman design and 3¥3 full factorial designs were utilized for factor screening and optimization respectively, to achieve well resolved asymmetric peaks of both internal standard and drug with good theoretical plates. The optimized chromatographic peak was obtained with mobile phase composition of 10 mM ammonium acetate buffer (pH 6) and acetonitrile (60:40, v/v) at a flow rate of 1.0 ml/m and detection wavelength of 243 nm using Kromasil C 18 (250 mm × 4.6 mm; 5 μm) column. Non normality, skewness or outliers did not exist as demonstrated by residual plot. To eliminate the possible interferences in the biological matrices, a new solid-phase extraction method using STRATA X C 18 Phenomenex cartridges was developed and evaluated. The method was validated as per USFDA guideline. The developed method was efficiently applied to pharmacokinetic study in rat plasma.
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