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Abstract
AbstractThe effect of cytochrome c on the redox behavior of 1,4‐benzoquinone and cystine has been investigated by differential pulse polarography. The adsorption of cytochrome c on mercury surface produces a lowering of the reduction peak of 1,4‐benzoquinone and of the cystine prepeak. When the covering of the drop is maximal, no variation in peak height is observed. By using the Koryta equation, values between 1500 and 2300 Å2 for the surface area of one adsorbed cytochrome c molecule were obtained. The capacitance dependences on concentration and time have been determined by alternating‐current polarography, and lead to the surface area values of 2800 and 2700 Å2, respectively. Results are interpreted on the basis of an unfolding of cytochrome c molecules during the adsorption process. It is likely that a rather compact covering is obtained, but about 10% of the mercury surface seems to be unoccupied and corresponds to the accessible interstices between adjacent molecules.
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