Development of electrochemical methods for determination of atorvastatin and analytical application to pharmaceutical products and spiked human plasma

Atorvastatin is a new synthetic inhibitor of HMG-CoA reductase that has been recently and intensively prescribed as an antihyperlipoproteinemic,drug. The property was exploited in developing a highly sensitive stripping voltammetric procedure for the determination of the drug. The anodic current of adsorbed compound is measured by differential pulse and Osteryoung square wave adsorptive stripping voltammetry, preceded by a period of preconcentration. The effect of various parameters such as supporting electrolyte composition, pH, initial potential, scan rate, accumulation time, and ionic strength are discussed to characterize the interfacial and redox behavior. The methods were performed in Britton-Robinson buffer, and the corresponding calibration graphs were constructed and statistical parameters evaluated. Applying the differential pulse adsorptive stripping voltammetry and Osteryoung square wave adsorptive stripping voltammetric method at pH 2.0 linearity was achieved from 3.5x10(-8) to 4.6x10(-7) M for square wave adsorptive stripping voltammetry with limit detection and limit quantitation of 4.0x10(-9) M, 2.0x10(-9) M and 1.0x10(-8) M, 2.0x10(-8) M, respectively. Since the proposed methods enabled lower concentrations of atorvastatin to be determined, this method was tested for atorvastatin determination in pharmaceutical products and spiked human plasma.