Selenocystine voltammetry at metallic electrodes displays behavior consistent with formation of a conductive, selenium-based surface modification, followed by diffusion-controlled, quasi-reversible reduction. X-ray photoelectron spectroscopy confirms the presence of selenium on substrates that have been electrochemically cycled in selenocystine solution at neutral pH. These modified electrodes are of interest given that aqueous electroanalytical study of chalcogen-containing molecules is often hindered by unwanted oxidation and non-specific surface adsorption. In this work, we will describe application of selenium-modified electrodes to the voltammetric study of physiologically relevant chalcogen-containing compounds, including cysteine, cystine, and 1,3-dimethylimidazole-2-selone. We will also present the development of a customized electrochemical cell that enables spectroscopic characterization of voltammetrically modified gold substrates.

Electrochemical studies of organochalcogen-containing compounds

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