Electrochemical behaviour of FAD and FMN immobilised on TiO2 modified carbon fibres supported by ATR-IR spectroscopy of FMN on TiO2

Kubota, Lauro T.; Gorton, Lo; Roddick-Lanzilotta, A.; McQuillan, A. James

doi:10.1016/s0302-4598(98)00182-2

Cited by 44 publications

(53 citation statements)

References 41 publications

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“…In addition E o´ was independent of the solution pH, which was attributed to the protection effect of ZP over riboflavin. However, under the same conditions, FAD and FMN did not adsorb on ZP 16 or TP, 18 but were strongly adsorbed on titanium oxide dispersed on carbon fibers. Materials based on silica have been used to immobilize organic dyes in carbon paste electrodes and have been shown to improve the electrochemical activity and/or to shift their potential to a more desirable potential range.…”

Section: Introductionmentioning

confidence: 90%

“…Attempts to increase the reaction rate between flavins and NADH include derivating flavins, [13][14][15] immobilization of flavins on matrices to cause a shift of its E o´ toward more positive values. [16][17][18] Flavins have been adsorbed on graphite, glassy carbon, platinum and gold 19 electrodes surfaces and have also been attached through mercaptan 20 and thiourea 21 linkages to noble metal substrates or using of the Langmuir-Blodgett technique. 22 However, many systems show slow electron transfer rates, weak flavin-conductor interaction or suffer from instability due to flavin desorption.…”

Section: Introductionmentioning

confidence: 99%

“…The immobilization of riboflavin on zirconium phosphate (ZP) or titanium phosphate (TP) in carbon paste yielded an E o´ shift of approximately 250 mV or 100 mV, respectively, towards a more positive potential compared with their values in solution. 17,18 This shift was assigned to the interaction between the basic nitrogen of riboflavin and the acid groups of ZP or TP. In addition E o´ was independent of the solution pH, which was attributed to the protection effect of ZP over riboflavin.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…It has also been suggested that aromatic compounds intercalate into layered phosphates such as ZP [37,38] and that intercalation of the aromatic compound into the layered phosphate could possibly cause the shielding effect of the pH of the solution on the bound mediator. In an earlier investigation [39], it was shown by using attenuated total reflectance infrared spectroscopy that methylene green being positively charged adsorbs onto titanium phosphate through electrostatic interactions whereas in the case of uncharged riboflavin there are other kinds of interactions (via the N5 of the isoalloxazine ring).…”

Section: Electrochemical Behavior Of Modified Electrodesmentioning

confidence: 99%

NADH Oxidation Using Carbonaceous Electrodes Modified with Dibenzo‐Dithia‐Diazapentacene

et al. 2003

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The electrochemical and the electrocatalytic behavior for NADH oxidation of a newly synthesized phenothiazine derivative, 16H,18H-dibenzo[c,1]-7,9-dithia-16,18-diazapentacene (DDDP), adsorbed on solid spectrographic graphite and on graphite powder or on zirconium phosphate (ZP), both entrapped in carbon paste, were compared. Experiments using cyclic voltammetry and a rotating disk electrode, performed in different experimental conditions (various pH values and NADH concentrations), showed that i) in the pH range between 4 and 8, the E8× value for DDDP adsorbed on ZP becomes pH independent; ii) in contrast to other redox mediators, adsorption of DDDP on ZP induced a significant negative shift of the E8× value; iii) the reaction rate for electrocatalytic oxidation of NADH is markedly increased by adsorbing the mediator on ZP, being further improved by the presence of Ca 2 ions in the solution.

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“…The phenothiazine dyes easily also adsorb directly onto a wide range of substrates including graphite [24,25], titanium phosphate [26], carbon nanotubes [27], zinc oxide [28,29] and these dyes have been covalently attached on silica gel [30] and gold electrodes through a cysteamine linkage [31]. All these modified electrodes have been used for detection of NADH at lower potential.…”

Section: Introductionmentioning

confidence: 99%

Amperometric Sensor for Detection of the Reduced Form of Nicotinamide Adenine Dinucleotide Using a Poly(pyronin B) Film Modified Electrode

Kumar

Chen

2009

Electroanalysis

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An electrochemical method for the preparation of poly(pyronin B) film was proposed in this paper. A poly(pyronin B) (poly(PyB)) film modified glassy carbon electrode (GCE) has been fabricated via an electrochemical oxidation procedure and applied to the electrocatalytic oxidation of reduced form of nicotinamide adenine dinucleotide (NADH). The poly(PyB) film modified electrode surface has been characterized by atomic force microscope (AFM), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV-visible absorption spectrophotometry (UV-vis) and cyclic voltammetry (CV). These studies have been used to investigate the poly(PyB) film, which demonstrates the formation of the polymer film and the excellent electroactivity of poly(PyB) in neutral and even in alkaline media. Due to its potent catalytic effects towards the electrooxidation of NADH at lower potential (0.0 V), poly(PyB) film modified electrode can be used for the selective determination of NADH in real samples because of dopamine, ascorbic acid and uric acid oxidation can be avoided at this potential. The catalytic peak currents are linearly dependent on the concentrations of NADH in the range of 1.0 Â 10 À6 to 5.0 Â 10 À4 mol/L with correlation coefficients of 0.999. The detection limits for NADH is 0.5 Â 10 À6 mol/L. Poly(PyB) modified electrode also shows good stability and reproducibility due to the irreversible attachment of polymer film at GCE surface.

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Electrochemical behaviour of FAD and FMN immobilised on TiO2 modified carbon fibres supported by ATR-IR spectroscopy of FMN on TiO2

Cited by 44 publications

References 41 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

NADH Oxidation Using Carbonaceous Electrodes Modified with Dibenzo‐Dithia‐Diazapentacene

Amperometric Sensor for Detection of the Reduced Form of Nicotinamide Adenine Dinucleotide Using a Poly(pyronin B) Film Modified Electrode

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