Electrochemical Investigation of Dopamine and Pyrocatechol with Unmodified and Banana Tissue Modified Carbon Paste Electrodes

B.S. Grabarić, I. Kruhak*, J. Velikonja, M. Tkalčec

Faculty of Chemical Engineering and Technology and *Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia

Article history:
Received December 8, 1993
Accepted December 30, 1993

Summary:
The electrochemical investigation of a neurotransmitter and drug, dopamine, and an air pollutant, pyrocatechol, was performed with unmodified and banana tissue modified carbon paste electrodes by cyclic voltammetry and differential pulse voltammetry in batch experiment and amperometrically in a continuous flow injection mode. It has been demonstrated that the electrochemical activation of the unmodified carbon paste electrode plays an important role in pyrocatechol determination, while for dopamine determination the catalytic effect of the (poly)phenol oxidase present in a banana tissue is predominant.