VOLTAMMETRIC ANALYSIS OF XANTHINE DERIVATIVES AT THE GRAPHITE ELECTRODE. EFFECT OF COPPER IONS

• Autoři: JELEN František; KAYRAN Ugur; TRNKOVÁ Libuše; OZSOZ Mehmed
• Rok publikování: 2011
• Druh: Konferenční abstrakty
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• Popis: Voltammetric analysis of purine derivatives in the presence of copper ions has been performed earlier [e.g.1,2]. Here we present electrochemical oxidations of some methylxanthines and their complexes with copper on a pencil graphite electrode (PeGE) by means of linear sweep voltammetry (LSV) and elimination voltammetry with linear scan (EVLS) [3,4]. The analysis is based on the reaction of N-methyl derivatives of xanthine with cuprous ions which were generated electrochemically in situ (CuSO4 in 0.1M BR buffer, pH 5.1) at the accumulation potential Ea 0.15 V (vs. Ag/AgCl/3M KCl) for the accumulation time ta 120 s. A tentative mechanism for the formation of the copper-xanthine complex was suggested. Our results showed that carbon electrode in connection with EVLS can be an excellent prototype for cheap and fast working sensor for xanthine derivatives in the presence of copper.

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