PMID: 9630726Jun 19, 1998Paper

Kinetics of electron and proton transfer to ubiquinone-10 and from ubiquinol-10 in a self-assembled phosphatidylcholine monolayer

Biochimica Et Biophysica Acta
M R MoncelliR Guidelli

Abstract

Upon incorporating from 0.5 to 2 mol% ubiquinone-10 (UQ) in a self-assembled monolayer of dioleoylphosphatidylcholine (DOPC) supported by mercury, the kinetics of UQ reduction to ubiquinol-10 (UQH2) as well as that of UQH2 oxidation to UQ were investigated in borate buffers over the pH range from 8 to 9.5 by cyclic voltammetry. A general kinetic approach was adopted to interpret the dependence of the applied potential upon the scan rate at constant pH and upon pH at constant scan rate, while keeping the initial reactant concentration and the faradaic charge constant. The oxidation of UQH2 to UQ in DOPC monolayers occurs via the reversible release of one electron with formation of the semiubiquinone radical cation UQH2.+, followed by its rate-determining deprotonation by hydroxyl ions with formation of the UQH. neutral radical; the latter is then instantaneously oxidized to UQ. Analogously, the rate-determining step in UQ reduction to UQH2 consists in the protonation by hydrogen ions of the semiubiquinone radical anion UQ.- resulting from the reversible uptake of one electron by UQ. However, a non-negligible fraction of UQ.- uptakes protons very slowly, and hence, retains its intermediate oxidation state during the recording of ...Continue Reading

References

Apr 11, 1979·Biochimica Et Biophysica Acta·K I Takamiya, P L Dutton
Dec 18, 1984·Biochimica Et Biophysica Acta·M A StidhamJ N Siedow

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Citations

Apr 28, 2004·Bioelectrochemistry·Miroslav Karabaliev, Valery Kochev
Aug 1, 2009·Bioelectrochemistry·Lida FotouhiMajid M Heravi
May 23, 2008·Bioelectrochemistry·Slawomir Michalkiewicz
Feb 14, 2004·Advances in Colloid and Interface Science·Valery Kochev, Miroslav Karabaliev
Mar 1, 2015·Bioelectrochemistry·Javier HoyoFausto Sanz
Jun 29, 2011·Physical Chemistry Chemical Physics : PCCP·Celia LemmerRita Meunier-Prest
Mar 3, 2012·The Journal of Physical Chemistry. B·Rui Campos, Ritu Kataky
Jul 9, 2013·Analytical Chemistry·Víctor Agmo HernándezKatarina Edwards
May 10, 2011·Journal of the American Chemical Society·Ivan BogeskiMarkus Hoth

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