Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100558
Type: Artigo de evento
Title: Electrochemical Behaviour Of Fad And Fmn Immobilised On Tio2 Modified Carbon Fibres Supported By Atr-ir Spectroscopy Of Fmn On Tio2
Author: Kubota L.T.
Gorton L.
Roddick-Lanzilotta A.
McQuillan A.J.
Abstract: Carbon fibre electrodes were modified with titanium oxide and used to adsorb some flavins on the electrode surface. FAD and FMN strongly adsorbed on the titanium oxide dispersed on carbon fibres and remained stable for at least 2 months. The formal potential (E°') at pH 7.0 of adsorbed FAD and FMN were -245 and -250 mV vs. SCE, respectively. The shift of the E°' of about 200 mV towards more positive values at pH 7.0 compared with that of the dissolved flavin was assigned to the interaction between titanium oxide and the flavins. The variation of the E°' with pH between 1 and 8 was also very much less than for dissolved flavins. The adsorbed flavins showed a good electrocatalytic activity for NADH oxidation in aqueous solution applying a potential of 0 mV vs. SCE. The stability of the electrode was very good and no significant change in either surface coverage of FMN or FAD or electrocatalytic response for NADH oxidation was observed after 250 cycles. A linear response range for NADH between 1 and 6 mM was obtained. Additionally, attenuated total reflectance IR-spectra of FMN adsorbed on titanium films were recorded to clarify the interaction between the flavin and the support. Copyright (C) 1998 Elsevier Science S.A.Carbon fibre electrodes were modified with titanium oxide and used to adsorb some flavins on the electrode surface. FAD and FMN strongly adsorbed on the titanium oxide dispersed on carbon fibres and remained stable for at least 2 months. The formal potential (E°′) at pH 7.0 of adsorbed FAD and FMN were -245 and -250 mV vs. SCE, respectively. The shift of the E°′ of about 200 mV towards more positive values at pH 7.0 compared with that of the dissolved flavin was assigned to the interaction between titanium oxide and the flavins. The variation of the E°′ with pH between 1 and 8 was also very much less than for dissolved flavins. The adsorbed flavins showed a good electrocatalytic activity for NADH oxidation in aqueous solution applying a potential of 0 mV vs. SCE. The stability of the electrode was very good and no significant change in either surface coverage of FMN or FAD or electrocatalytic response for NADH oxidation was observed after 250 cycles. A linear response range for NADH between 1 and 6 mM was obtained. Additionally, attenuated total reflectance IR-spectra of FMN adsorbed on titanium films were recorded to clarify the interaction between the flavin and the support.
Editor: Elsevier Science S.A., Lausanne, Switzerland
Rights: fechado
Identifier DOI: 10.1016/S0302-4598(98)00182-2
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0032214121&partnerID=40&md5=1148a14a77ab810b8ecb68336c244708
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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