Electrochemistry of electropolymerized tetra(p-aminophenyl)porphyrin nickel film electrode and catalytic oxidation of acetaminophen

A polymer film of tetra(p-aminophenyl) porphyrin nickel was obtained at a glassy carbon electrode by a cyclic voltammetric method. Cyclic voltammograms of the film electrode exhibited two stable redox waves with anodic peak potential at 0.43 V and cathodic peak potential at 0.30 V in 0.5M NaOH aqueous solution. The electrocatalytic characteristics of the film electrode were studied by cyclic voltammetry, a.c. impedance analysis and other methods. The oxidation peak current increased linearly with the addition of acetaminophen to the aqueous NaOH medium in the range 1 x 10(-6)-2 x 10(-4)M acetaminophen. The performance of the electrode was verified by the determination of acetaminophen in a paracetamol preparation.