Electrochemical Oxidation of 5-Hydroxytryptamine and 5- Hydroxyindoleacetic Acid at Ultrasmall Gold Ring Electrodes
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
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Ultrasmall gold ring electrodes have been constructed by electrodeposition of gold onto carbon ring electrodes. Electrodes thus formed show similar adsorptiondesorption peaks for oxygen in H2SO4 solution compared to those obtained at conventional-sized electrodes. These electrodes have been used in conjunction with linear scan voltammetry and subsequent cleaning pulses to obtain repeatable quantitative results for the electro-chemical oxidation of 5-hydroxytryptamine and 5-hydroxyindoleacetic acid. This technique involves the use of a linearly scanned applied potential, followed by a large positive potential to clean the electrode oxidatively and negative potential for electrode activation. The result of the cleaning pulses is that the oxidation products of 5-hydroxytryptamine are cleaned off the electrode and reproducible voltammograms are obtained.
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