Alternating current polarography of riboflavin

Breyer, B.; Biegler, T.

doi:10.1135/cccc19603348

Cited by 29 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been reported that in acidic solutions, both the oxidized and the reduced forms of R F are strongly adsorbed on a Hg surface (5,6,10). One monolayer of oxidized R F oriented parallel to the electrode surface and two layers (a bilayer) of the reduced R F (RFH2) are thought to adsorb (8,9 presence of these adsorbed layers, the reduction of RF from solution was found to occur via a reversible two-electron transfer reaction (9).…”

Section: Introductionmentioning

confidence: 99%

“…The electrochemical behavior of the flavins, particularly of RF, has been studied at H g electrodes, primarily with the use of dc and ac polarographic and also chronopotentiometric methods (5)(6)(7)(8)(9). It has been reported that in acidic solutions, both the oxidized and the reduced forms of R F are strongly adsorbed on a Hg surface (5,6,10).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

Birss¹,

Elżanowska²,

Turner³

1988

Can. J. Chem.

View full text Add to dashboard Cite

Can. J. Chem. 66, 86 (1988) A detailed investigation of the electrochemical behavior of flavin adenine dinucleotide (FAD) in neutral solutions has been carried out at Hg and glassy carbon electrodes. At FAD concentrations of about M, cyclic voltammetiy (CV) shows apair of anodic and cathodic peaks having a peak separation at low sweep rates indicative of a two-electron transfer process and yielding a formal redox potential for FAD of -0.206 k 0.003 V vs. NHE at pH 7. Evidence for FAD adsorption was obtained in experiments at high sweep rates, from the effect of time of exposure of the electrode surface to FAD in solution and from the effect of the potential limits on the cyclic voltammetric response. The process of FAD adsorption was studied in detail in dilute FAD solutions (ca M ) using a hanging mercury drop electrode and the techniques of CV and ac voltammetry. Three distinct stages of FAD adsorption were observed and a model of the orientation of FAD on the electrode surface as a function of time and potential is presented. In addition, the kinetics of oxidation and reduction of adsorbed FAD was studied for each of the stages of FAD deposition, and a surface standard rate constant of ca.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

Birss¹,

Elżanowska²,

Turner³

1988

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…proceeds with the formation of large amounts of semiquinone. Adsorption of flavin compounds was reported at mercury (3,4) and solid (5) electrodes. Preferential accumulation of the reactant or product, or adsorption of both, is indicatedaccording to Brdicka theory-from the postwaves and prewaves present.…”

Section: Literature Citedmentioning

confidence: 99%

“…Preferential accumulation of the reactant or product, or adsorption of both, is indicatedaccording to Brdicka theory-from the postwaves and prewaves present. Hartley and Wilson (3) and Gorton and Johansson (5) showed that well-defined cyclic voltammograms can be obtained after transferring the electrode with the accumulated flavin compound to a blank solution. Traditionally the adsorption phenomenon has led to anomalous results and has been regarded as undesirable in polarographic measurements.…”

Section: Literature Citedmentioning

confidence: 99%

Adsorptive stripping voltammetry of riboflavin and other flavin analogs at the static mercury drop electrode

Wang¹,

Luo²,

Farias³

et al. 1985

Anal. Chem.

View full text Add to dashboard Cite

“…A number of earlier studies have dealt with the electrochemistry of flavins using Hg electrodes [6][7][8][9][10][11], and the reduction and oxidation of the isoalloxazine group has been determined to proceed by means of a reversible two-electron transfer reaction. The importance of the redox chemistry of flavin molecules in biological systems has led to the modification of various electrode surfaces with flavin molecules and/or flavin-containing enzymes for use as biosensors [12-17}. The redox potential of the isoalloxazine ring in enzymes can vary by several hundred mVs [18,19].…”

Section: Introductionmentioning

confidence: 99%

Adsorbed lumiflavin at mercury electrode surfaces

McGarvey

Beck

Quach

et al. 1998

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

The adsorption of lumiflavin (LF) at a mercury electrode surface has been studied by means of cyclic voltammetry in phosphate buffer solutions of pH 6, 7 and 8. At low to medium coverages, LF, which is redox-active, is suggested to adsorb in an orientation parallel to the electrode surface, independent of potential. At higher coverages, concerted re-orientations of the LF monolayer occur as the potential is changed. At potentials positive of ca. -0.35 V and negative of -1.0 V, adsorbed LF is likely in the parallel configuration, while two perpendicular orientations exist at potentials between these limits, consistent with higher attainable coverages. One of these is particularly stabilized in pH 6 solutions, when reduced LF is known to be uncharged, while it is likely to be anionic (and hence de-stabilized) at pH 7 and 8. A second set of small redox peaks observed just negative of the main redox peaks have been assigned to lumiflavin dimers, formed when the molecules are oriented in the perpendicular orientation in the negative potential range. The electrochemical behaviour of LF shows striking differences from that of FAD, although the common electrochemically active moiety is the isoalloxazine ring system.

show abstract

Alternating current polarography of riboflavin

Cited by 29 publications

References 0 publications

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

Adsorptive stripping voltammetry of riboflavin and other flavin analogs at the static mercury drop electrode

Adsorbed lumiflavin at mercury electrode surfaces

Contact Info

Product

Resources

About