ELECTROCHEMICAL-BEHAVIOR OF NEUROTRANSMITTERS ADSORBED ON GOLD

The redox reactions of adsorbed layers on gold are studied for the fol lowing neurotransmitters: epinephrine, dopamine, serotonin and acetylc holine. The adsorption fakes place at open circuit condition. The resu lts are compared with the others obtained with phenol, hydroquinone, a scorbic acid, chloride, melatinin and chloranilic acid. The adsorbed c atecholamines present a reversible oxidation of the OH groups of the r ing, and an irreversible oxidation at higher potentials. Serotonin sho ws two reversible couples. Melatonin, on the other hand, shows a uniqu e couple. Acetylcholine shows an irreversible oxidation only.