Electrochemical behavior of FAD at a gold electrode studied by electrochemical quartz crystal microbalance

✍ Scribed by Ying Wang; Guoyi Zhu; Erkang Wang

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 366 KB
• Volume: 338
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(96)00437-0

✦ Synopsis

The electrochemical behavior of flavine adenine dinucleotide (FAD) at a gold electrode involving adsorption of the reduced form FADHl and desorption of the oxidized form FAD has been studied by using electrochemical quartz crystal microbalance (EQCM). EQCM can present information not only about the electrochemical behavior but also about the mass changes on the electrode surface. The electrochemical properties and frequency shifts were investigated in FAD solutions at different pH values, concentrations and scan rates. Reversible voltammograms were observed when pH<4.5 and irreversible voltammograms were found when pHz4.5. It is found to be a diffusion controlled process when the concentration of FAD is lower than 2x lop4 mol 1-l (pH 1.5). On the contrary, at concentrations higher than 2x lop4 mollP' (pH 1.5). it is found to be an adsorption controlled process.