2012
Comparative voltammetric analysis of some purine derivatives on a pencil graphite electrode in the presence of copper ions
NAVRÁTIL, Rudolf, František JELEN a Libuše TRNKOVÁZákladní údaje
Originální název
Comparative voltammetric analysis of some purine derivatives on a pencil graphite electrode in the presence of copper ions
Autoři
NAVRÁTIL, Rudolf, František JELEN a Libuše TRNKOVÁ
Vydání
Praha, The 63rd Annual Meeting of the International Society of Electrochemistry - the book of abstracts, od s. nestránkováno, 1 s. 2012
Nakladatel
International Society of Electrochemistry
Další údaje
Jazyk
angličtina
Typ výsledku
Stať ve sborníku
Obor
10403 Physical chemistry
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Forma vydání
paměťový nosič (CD, DVD, flash disk)
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova anglicky
voltammetry;purine derivatives;copper;xanthine;electrochemical oxidation;adenine;copper complexes;LSV;linear sweep voltammetry; EVLS; elimination voltammetry with linear scan
Změněno: 17. 1. 2013 09:43, Mgr. Sylvie Dohnalíková
Anotace
V originále
Voltammetric analysis of purine derivatives in the presence of copper ions was performed earlier [e.g. 1,2]. Here we present electrochemical oxidation of xanthine in comparison with adenine, and oxidation of their copper complexes by means of linear sweep voltammetry (LSV) and elimination voltammetry with linear scan (EVLS) [3,4]. The analysis is based on their reaction with cuprous ions on a pencil graphite electrode (PeGE) and formation of a sparingly soluble complex adsorbed on an electrode surface. Copper complexes are 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) and a short accumulation time. We have investigated the effect of the following parameters: the ratio of component concentrations, potential jumps from starting potentials to purine oxidation potentials, pH, and scan rate. In accordance with our previous results, xanthine is oxidized more easily than adenine, and both oxidation signals were enhanced by copper ion addition. Moreover, EVLS revealed the differences between electrode processes of the purines analysed and suggested a tentative mechanism for the formation of the copper-purine complex. Our results showed that PeGE in connection with EVLS [3,4] can be an excellent prototype for a cheap and fast working sensor for purine derivatives in the presence of copper.
Návaznosti
MUNI/A/0992/2009, interní kód MU |
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