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Title: Voltammetric and impedance studies of inosine-5'-monophosphate and hypoxanthine
Authors: Brett, Ana Maria Oliveira 
Silva, Luís A. 
Farace, Giosi 
Vadgama, Pankaj 
Brett, Christopher M. A. 
Keywords: Inosine 5'-monophosphate; Hypoxanthine; Electrochemical adsorption; Differential pulse voltammetry; Electrochemical impedance; DNA-biosensor
Issue Date: 2003
Citation: Bioelectrochemistry. 59:1-2 (2003) 49-56
Abstract: The oxidation mechanism and adsorption of inosine 5'-monophosphate and hypoxanthine were investigated in solutions of different pH using voltammetric and impedance methods at glassy carbon electrodes. For both compounds, the pH dependence from differential pulse voltammetry showed that the same number of electrons and protons are involved in the rate-determining step of the electrochemical reaction. In the case of hypoxanthine, it was also possible to study the effect of different concentrations. At high concentrations of hypoxanthine, two oxidation peaks were observed, the first due to hypoxanthine oxidation with formation of oligomers and the second due to hypoxanthine oligomer oxidation, both compounds adsorbing strongly. Impedance measurements corroborated the voltammetric results and enabled the study of the adsorption of hypoxanthine on glassy carbon.
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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