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A Validated Adsorptive Stripping Voltammetric Determination of Antidiabetic Agent Pioglitazone HCl in Tablets and Biological Fluids

Keywords: pioglitazone HCl , square-wave , adsorptive stripping voltammetry , biological fluids , actos tablets , pharmacokinetic

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Square-wave adsorptive cathodic stripping voltammetry was used to determine pioglitazone HCl in Britton Robinson buffer of pH5. The adsorptive cathodic peak was observed at 1.5 V vs. Ag/AgCl. The peak response was characterized with respect to pH, supporting electrolyte, frequency, scan increment, pulse-amplitude, accumulation potential and pre-concentration time. Under optimal conditions, the peak current is proportional to the concentration of pioglitazone HCl, and a linear calibration graphs were obtained within the concentration levels of 10-8 and 10-4 M following different accumulation time periods (0-300 s). The obtained results were analyzed and the statistical parameters were calculated. The detection limit is 8.08 × 10-9 M (3.17 ng ml-1) using 300 s pre-concentration time, whereas the quantitative limit is 2.45 × 10-8 M (9.63 ng ml-1). The proposed method was applied to assay the drug in pharmaceutical formulations and biological fluids. The pharmacokinetic parameters of drug in human plasma were estimated as: Cmax=785.8 ng ml-1, tmax=1.5 h, Ke=0.125 h-1 and t1/2 = 8 h which are favorably compared with those reported in literature.


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