Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5189
Title: An impedance study of the adsorption of nucleic acid bases at glassy carbon electrodes
Authors: Oliveira-Brett, A. M. 
Brett, C. M. A. 
Silva, L. A. 
Keywords: Guanine; Guanosine; Adenine; Adsorption; Electrochemical impedance; Ultrasound
Issue Date: 2002
Citation: Bioelectrochemistry. 56:1-2 (2002) 33-35
Abstract: Electrochemical impedance has been used to study the adsorption at glassy carbon electrodes of guanine, its corresponding nucleoside, guanosine, and adenine. Impedance studies at different concentrations and applied potentials show clearly that all three bases are adsorbed on the electrode, blocking the surface. Irradiating the electrode with low-frequency (20 kHz) ultrasound whilst recording the impedance spectra increased transport of molecules to the electrode surface with cavitation cleaning the surface and removing strongly adsorbed molecules of bases. In this way, sonoelectrochemical experiments enabled the electrode processes to be studied in the absence of adsorption.
URI: http://hdl.handle.net/10316/5189
DOI: 10.1016/S1567-5394(02)00017-8
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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