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- W2077668412 abstract "The dc cyclic voltammetry of several redox proteins at thin film ruthenium dioxide electrodes is described. Quasi-reversible voltammetric responses were obtained for cytochrome c, azurin, ferredoxin, rubredoxin and plastocyanin at this electrode with solution conditions, pH 8.0 (5 mM Tricine) and 100 mM NaCl as supporting electrolyte. The values of E1/2 are in good agreement with those in the literature. On varying the pH and solution ionic strength striking differences in response emerge. For the negatively charged proteins, ferredoxin, rubredoxin and plastocyanin, no measurable faradaic response is observed at lower ionic strength (pH 8.0, 1 mM N2Cl). The electrochemistry can, however, be promoted by multivalent cations (Cr(NH3)3+6 or Mg2+) giving rise to a well-defined quasi-reversible response. For cytochrome c, variation of the dc cyclic voltammetric response with pH correlates with the (acid-base) protonation properties of the electrode surface. The electrochemistry of azurin does not vary appreciably with changes of pH or ionic strength. The results found highlight the importance of electrostatics at the electrode/solution interface. Preliminary results using IrO2, Na0.7WO3 and single-crystal RuO2 electrodes are reported. Subtle differences in behaviour are found at the single-crystal and thin-film RuO2 electrodes." @default.
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- W2077668412 date "1985-07-01" @default.
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- W2077668412 title "The direct electrochemistry of redox proteins at metal oxide electrodes" @default.
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- W2077668412 doi "https://doi.org/10.1016/0368-1874(85)80070-8" @default.
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