Abstract
The promotion of horse heart cytochrome c electrochemistry at a gold minigrid electrode in the presence of some amino acids in solution has been investigated by cyclic voltammetry. Of these, Cys, His, Met, Cis and Trp have proved to be effective in facilitating electron transfer between Cyt c and the gold electrode, and good, quasi-reversible redox reactions were achieved. Under alkaline pH conditions, the above amino acids also present a promotion effect on the electrochemistry of Cyt c, but a different cyclic voltammogram appears. The new appearance results from the stability of different conformation states of Cyt c at different pH regions. Trp shows a more pH dependent ability in promoting the electrochemistry of Cyt c at a gold electrode. Probably, the proton dissociation and steric factor of the bulky indole group account for its electrochemical behavior. The spectroelectrochemistry of cytochrome c in the presence of various amino acids has also been examined
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