Voltammetric determination of L-cysteine on surface of a PbPCNF-modified carbon paste electrode in acidic medium

This work describes the electrochemical behavior of lead pentacyanonitrosylferrate (PbPCNF) film immobilized on the surface of carbon paste electrode (CPE) and its electrocatalytic activity toward the oxidation of L-cysteine in acidic medium. The electrode was prepared by electroless derivatization of Pb-doped carbon paste electrode surface to the redox active PbPCNF solid film, in the presence of sodium pentacyanonitrosylferrate, Na2[Fe(CN)5NO], (PCNF). The morphology of the PbPCNF-modified CPE was characterized by scanning electron microscopy (SEM) technique. Some important advantages such as simple preparation, fast response, good stability, interference-free signals, antifouling properties and reproducibility of the sensor for differential pulse voltammetric determination of L-cysteine were achieved.

Keywords:

L-Cysteine , lead pentacyanonitrosylferrate , Electrocatalysis , Differential pulse voltammetry