Rapid high performance liquid chromatographic method for determination of clarithromycin in human plasma Using amperometric detection: application in pharmacokinetic and bioequivalence studies

A rapid, sensitive and reproducible HPLC method using amperometric detector was developed and validated for the analysis of clarithromycin in human plasma. The separation was achieved on a monolithic silica column [MZ- C8 125×4.0 mm] using acetonitrile- methanol-potassium dihydrogen phosphate buffer [40:6:54,v/v], with pH of 7.5, as the mobile phase at a flow rate of 1.5 mL/min. The assay enables the measurement of clarithromycin for therapeutic drug monitoring with a minimum quantification limit of 20 ng/mL. The method involves simple, protein precipitation procedure and analytical recovery was complete. The calibration curve was linear over the concentration range of 0.1-6 [micro]g/mL. The coefficients of variation for inter-day and intra-day assay were found to be less than 6%. This method was used in bioequivalency and pharmacokinetic studies of the test [generic] product 2 × 500 mg clarithromycin tablets, with respect to the reference product