Electrochemical Characterization of a Modified Electrode Based on Carbon Nanotubes and a Synthesized Schiff Base: Application for Voltammetric Determination of Epinephrine, Acetaminophen and Folic Acid

The electrochemical behavior of a multiwalled carbon nanotube paste electrode modified with 2-((7-(2, 5-dihydrobenzylideneamino) heptylimino) methyl) benzene-1, 4-diol (DBHB) was studied. The pH dependent, apparent charge transfer rate constant and transfer coefficient were investigated for the electrochemical behavior of DBHB. This electrode showed high electrocatalytic activity toward oxidation of epinephrine (EP) relative to an unmodified carbon paste electrode. Cyclic voltammetry and chronoamperometry were used to study the electro-oxidation of EP at the modified electrode and electrocatalytic mechanism, catalytic rate constant and diffusion coefficient was obtained for oxidation of EP. Using differential pulse voltammetry (DPV) a highly selective and simultaneous determination of EP, acetaminophen (AC) and folic acid (FA) has been obtained at the modified electrode as an electrochemical sensor. The present method provides a simple method for selective detection of EP in biological samples.