Catalytic oxidation of biological components on platinum electrodes modified by adsorbed metals: Anodic oxidation of catecholamines |
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| Affiliation: | 1. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan;2. WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan;3. Graduate School of Environmental Studies, Tohoku University, 6-6-11-604 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan;4. Japan Aviation Electronics Industry, Ltd. 1-1, Musashino 3-chome, Akishima-shi, Tokyo, Japan;5. Micro System Integration Center, Tohoku University, 519-1176 Aramaki-aza Aoba, Aoba-ku, Sendai, Japan |
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| Abstract: | The catalytic oxidation of catecholamines on Pt electrodes modified by adsorbed metals (denoted as Mad) was studied in 1 M HClO4) by linear sweep voltammetry. The anodic peaks of four catecholamines (adrenaline, noradrenaline, iso proterenol and DOPA) shift to the negative potential side in the presence of Mad, such as Biad and Pbad. The anodic oxidation of catecholamines proceeds without the production of poisonous species on a bare Pt electrode. The catalytic activity depends on the surface coverage by Mad (denoted as θM). The maximal effect of Mad is attained at θM = 0.5. The presence of Mad promotes the formation of the final product through irreversible hydroxylation following the electron transfer. From these results it was suggested that in the catalytic processes Mad plays the major role in the provision of effective sites to activate water molecules which take part in the subsequent hydroxylation step. |
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