Interfacial electron transfer of flavin coenzymes and riboflavin adsorbed on textured TiO2 films

Shinohara, Hiroaki; Gräetzel, Michael; Vlachopoulos, Nicholas; Aizawa, Masuo

doi:10.1016/0302-4598(91)80032-x

Cited by 55 publications

(52 citation statements)

References 25 publications

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“…This is further evidence to support that a different mechanism of adsorption occurs for RF compared to FAD and FMN. Shinohara et al 29 reported a weaker adsorption of RF on the TiO 2 surface compared to FAD and FMN, as verified in the present study, and they suggested an important contribution of the phosphate group to the adsorption of flavins. This explanation can be used for Si:Zr:FAD and Si:Zr:FMN since the zirconium oxide has a great affinity to the phosphate group.…”

Section: Electrochemical Behavior Of the Adsorbed Flavinssupporting

confidence: 71%

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Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Yamashita¹,

Rosatto²,

Kubota³

2002

J. Braz. Chem. Soc.

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, mas em sistemas tampões e especialmente em fosfato foram verificadas velocidades satisfatórias de transferência de elétrons. As diferenças observadas no comportamento eletroquímico e espectro de absorção UV-visível entre as flavinas imobilizadas foram discutidas em termos de diferentes tipos de interação. , but in buffer systems and especially in phosphate a good rate of electron transfer was observed. The differences verified in the electrochemical behavior and UV-visible absorption spectra among the immobilized flavins are discussed in terms of different kinds of interaction.

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Section: Electrochemical Behavior Of the Adsorbed Flavinssupporting

confidence: 71%

“…29 However, other types of interaction must also be involved, since RF, which does not have a phosphate group, was also adsorbed on Si:Zr.…”

mentioning

confidence: 99%

Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Yamashita¹,

Rosatto²,

Kubota³

2002

J. Braz. Chem. Soc.

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“…Hence, it appears that the FAD electron-transfer kinetics is highly dependent on the electrode-surface chemistry, morphology, and surface charge distribution. Taking into account these observations and those published in [7] [34], it could be assumed that, under the conditions investigated in this study, the isoalloxazine moiety is oriented away form the surface, while the adenine ring is directly adsorbed on the surface, most probably in a flat orientation in order to maximize the p -p stalking with the GCE surface. In this orientation, the electron-transfer rate is slower than if the isoalloxazine moiety were in a direct contact with the electrode surface.…”

Section: Fad Adsorption Thermodynamicsmentioning

confidence: 97%

“…) [7]. Further, the parameter B ads , which reflects the affinity of FAD molecules towards adsorption sites at a constant temperature and electrode potential, can be presented as:…”

Section: Fad Adsorption Thermodynamicsmentioning

confidence: 99%

Interaction of Flavin Adenine Dinucleotide (FAD) with a Glassy Carbon Electrode Surface

Wei

Omanovic

2008

Chemistry & Biodiversity

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The interaction of flavin adenine dinucleotide (FAD) with a glassy carbon electrode (GCE) surface was investigated in terms of the FAD adsorption thermodynamics and kinetics, the subsequent electroreduction mechanism, and the corresponding electron-transfer rate. The kinetics of FAD electroreduction at the GCE was found to be an adsorption-controlled process. A set of electroreduction kinetic parameters was calculated: the true number of electrons involved in the FAD reduction, n=1.76, the apparent transfer coefficient, alpha(app)=0.41, and the apparent heterogeneous electron-transfer rate constant, k(app)=1.4 s(-1). The deviation of the number of exchanged electrons from the theoretical value for the complete reduction of FAD to FADH(2) (n=2) indicates that a small portion of FAD goes to a semiquinone state during the redox process. The FAD adsorption was well described by the Langmuir adsorption isotherm. The large negative apparent Gibbs energy of adsorption (DeltaG(ads)=-39.7 +/-0.4 kJ mol(-1)) indicated a highly spontaneous and strong adsorption of FAD on the GCE. The energetics of the adsorption process was found to be independent of the electrode surface charge in the electrochemical double-layer region. The kinetics of FAD adsorption was modeled using a pseudo-first-order kinetic model.

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“…Electron transfer from the conduction bands of the semiconductor oxides to adsorbed mononucleotides has been reported. 7 In the application of nanocrystalline TiO 2 films, it was claimed that the mesoporous morphology of the anatase layers offered a huge internal contact areas for the immobilization of DNA probes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mesoporous Hollow TiO₂Microcapsules for Application as a DNA Separator

Jeon¹,

Jin²,

Park³

et al. 2014

Bulletin of the Korean Chemical Society

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This study evaluated a simple and useful route to the synthesis of mesoporous TiO 2 microcapsules with a hollow macro-core structure. A hydrophilic precursor sol containing the surfactants in the hydrophobic solvents was deposited on PMMA polymer surfaces modified by non-thermal plasma to produce mesoporous shells after calcination. The surface of the PMMA polymer spheres was coated with NH 4 F and CTAB to control the interfacial properties and promote the subsequent deposition of inorganic sols. These hollow type mesoporous TiO 2 microcapsules could be applied as an efficient substrate for the immobilization of DNA oligonucleotides.

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Interfacial electron transfer of flavin coenzymes and riboflavin adsorbed on textured TiO2 films

Cited by 55 publications

References 25 publications

Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Interaction of Flavin Adenine Dinucleotide (FAD) with a Glassy Carbon Electrode Surface

Fabrication of Mesoporous Hollow TiO₂Microcapsules for Application as a DNA Separator

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Interfacial electron transfer of flavin coenzymes and riboflavin adsorbed on textured TiO2 films

Cited by 55 publications

References 25 publications

Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

Interaction of Flavin Adenine Dinucleotide (FAD) with a Glassy Carbon Electrode Surface

Fabrication of Mesoporous Hollow TiO2Microcapsules for Application as a DNA Separator

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Product

Resources

About

Fabrication of Mesoporous Hollow TiO₂Microcapsules for Application as a DNA Separator