Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10275722 | Journal of Electroanalytical Chemistry | 2005 | 10 Pages |
Abstract
The electrochemical oxidation of tyrosine has been studied on polycrystalline and (1Â 1Â 1) single crystal platinum electrodes in 0.1Â M HClO4. No surface sensitivity of bulk tyrosine reactions has been detected for these two electrodes, although the adsorption process seems to be structure-sensitive. The onset for tyrosine electrooxidation is observed at ca. 0.7Â V for both surfaces. In situ FTIR technique was used to discern the nature of the products formed during the oxidation processes. The early stages of tyrosine oxidation occur via a decarboxylation to carbon dioxide. Two complex parallel reactions were found at EÂ >Â 1.10Â V vs. RHE: one of them leading to a ?-lactone of hydroxy-substituted benzofurane, and the second with the formation of p-benzoquinone. The assignment of these products is based on the corresponding transmission spectra.
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Authors
Carlos F. Zinola, José L. RodrÃguez, M. Carmen Arévalo, Elena Pastor,