Figure 1. DA as an oxidizing mediator in the catechol-modified chitosan system. (a) Schematic of the system with the diffusing DA. (b) Continuous oxidation of DA in the presence of catechol (Q) reduction. (c) DA acts as an oxidizing mediator of QH2 , and Ru2+ as a reducing mediator regenerating the Q. Electrochemical potential bar represents standard reduction potential of Ru2+, Q and DA. [2]

From

Functionals Aspects and Simultaneous Detection of Dopamine, Ascorbic Acid and Uric Acid Using Chitosan-Catechol Graphene and Carbon Nanotube Modified Electrodes

Tjerignimin Adissa Silue, Valerie Lewitus, Abul Hussam, Hadar Ben-Yoav, Nathalia Peixoto

Journal of Biomedical Engineering and Technology. 2019, 7(1), 5-13 doi:10.12691/jbet-7-1-2