Electrochemistry of cytochrome c, plastocyanin, and ferredoxin at edge- and basal-plane graphite electrodes interpreted via a model based on electron transfer at electroactive sites of microscopic dimensions in size

Journal Article · Wed Dec 20 00:00:00 EST 1989 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00208a008· OSTI ID:7068748

Armstrong, F A; Bond, A M; Hill, A O; Oliver, B N; Psalti, I S.M. ^[1]

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1. Oxford Centre for Molecular Sciences (England)

The electrochemistry of a range of electron-transfer proteins at edge- and basal-plane graphite electrodes has been reconsidered using a microscopic model, which involves fast electron transfer at very small oxygen-containing electroactive surface sites. This model assumes that mass transport to the electrode occurs by radial diffusion when the density of the surface active sites is low (as is generally true in the case of the basal-plane graphite electrode) and by linear diffusion when the density of the active sites is increased sufficiently to cause overlap of the diffusion layers. With this model it is now proposed that the electrochemistry of cytochrome c, plastocyanin, and ferredoxin occurs with a very fast rate of charge transfer ({ge} 1 cm s{sup {minus}1}) at both edge- and basal-plane graphite electrodes. Critical factors, such as the mode of surface preparation, the pH, and the presence in the electrolyte of cations such as Mg{sup 2+} or Cr(NH{sub 3}){sub 6}{sup 3+}, control the density on surface sites, which result in the electrochemistry of a specific protein.

• OSTI ID: 7068748
• Journal Information: Journal of the American Chemical Society; (USA), Vol. 111:26; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
CYTOCHROMES
ELECTROCHEMISTRY
CALCULATION METHODS
DATA ANALYSIS
ELECTRON TRANSFER
EXPERIMENTAL DATA
FERREDOXIN
MEASURING INSTRUMENTS
MEASURING METHODS
PROTEINS
CHEMISTRY
DATA
INFORMATION
METALLOPROTEINS
NUMERICAL DATA
ORGANIC COMPOUNDS
PIGMENTS
400400* - Electrochemistry
550000 - Biomedical Sciences
Basic Studies