2005 journal article
Impact of surface immobilization and solution ionic strength on the formal potential of immobilized cytochrome c
LANGMUIR, 21(14), 6308–6316.
MeSH headings : Adsorption; Cytochromes c / chemistry; Enzymes, Immobilized / chemistry; Osmolar Concentration; Solutions; Static Electricity
TL;DR:
Four different self-assembled monolayer (SAM) electrode systems were examined electrochemically to better understand surface charge effects on the redox thermodynamics of immobilized horse heart cytochrome c (cyt c).
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Four different self-assembled monolayer (SAM) electrode systems were examined electrochemically in order to better understand surface charge effects on the redox thermodynamics of immobilized horse heart cytochrome c (cyt c). Neutralization of protein surface charge upon adsorption on anionic COOH-terminated SAMs was found to cause substantial changes in the formal potential, as determined by cyclic voltammetry. For cyt c immobilized on negatively charged surfaces, the formal potential shifted to more negative values as the ionic strength was decreased, which is opposite to the trend displayed by solution cyt c. In contrast, immobilization to uncharged interfaces resulted in an ionic strength dependence for cyt c that is similar to its solution behavior. The results provide insight into the importance of surface charge on the formal potential of cyt c.