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FTIR studies of tyrosine oxidation at polycrystalline Pt and Pt(1 1 1) electrodes by Carlos F. Zinola; José L. Rodríguez; M. Carmen Arévalo; Elena Pastor is a Engineering article available to read on EtoBox.

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The electrochemical oxidation of tyrosine has been studied on polycrystalline and (1 1 1) single crystal platinum electrodes in 0.1 M HClO 4 . 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. 0.7 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 E > 1.10 V vs. RHE: one of them leading to a c-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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Author

Carlos F. Zinola; José L. Rodríguez; M. Carmen Arévalo; Elena Pastor

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)