Electrochemical behavior of paclitaxel and its determination at glassy carbon electrode

The electrochemical behavior of paclitaxel drug was studied at a glassy carbon electrode in phosphate buffer solutions using cyclic and differential-pulse voltammetric techniques.The oxidation process was shown to be irreversible over the pH range(3.0e10.4)and was diffusion controlled.Effects of anodic peak potential(E_(p)),anodic peak current(Ipa),scan rate,pH,heterogeneous rate constant(k^(0)),etc have been discussed.A possible electrooxidation mechanism was proposed.An analytical method was developed for the determination of paclitaxel in phosphate buffer solution at pH¼7.0 as a supporting electrolyte.The anodic peak current varied linearly with paclitaxel concentration in the range 1.0×10^-(6)M to 1.0×10^-(5)M with a limit of detection(LOD)of 1.23×10^(-8)M and limit of quantification(LOQ)of 4.10×10^(-8)M.The proposed method was successfully applied to the determination of paclitaxel in pure and real samples.