Abstract
Direct reversible electron transfer between an electrode and ferredoxins has been described by several authors [l-8]. Recently, we have shown that at the dropping mercury electrode the efficiency of reduction of both 4Fe-4FS and 2Fe-2S ferredoxins can be enhanced drastically [8]. This increase in reduction efficiency was obtained by addition of a positively charged polymer or surfactant to the negatively charged ferredoxins, indicating that electrostatic effects play an important, if not a predominating role. Authors in [5,6] have reported on the reduction and oxidation of spinach ferredoxin at a gold electrode on which a polymeric form of methyl viologen was adsorbed. Authors in [7] have described the direct reversible
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