Electrochemical oxidation and reduction of ferredoxin adsorbed on mercury electrode surface. Phase-selective A.c. polarography at DME.
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概要
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The electrochemical behavior of <I>Clostridium pasteurianum</I> ferredoxin (Cl.Fd) was studied by a.c. polarography with the dropping mercury electrode. The a.c. polarograms observed in acidic media (pH<7) were assigned to RSH/RSHg redox reaction of the cysteine residues of apoferredoxin, whereas those observed in basic media (pH>8) were assigned to a two-step one-electron transfer (EE mechanism) to the iron-sulfur clusters of Cl.Fd adsorbed on the mercury electrode surface ((Cl.Fd)<SUB>ad</SUB>). The a.c. polarographic behavior of (Cl.Fd)<SUB>ad</SUB> observed in basic media was interpreted by theory of a.c. polarography of a two-step surface redox reaction. The formal standard oxidation-reduction potential of (Cl.Fd)<SUB>ad</SUB> was determined to be −0.33 V <I>vs.</I> NHE at pH 7.0, and its pH dependence was −30 mV/pH between pH 8 and 10.
- 公益社団法人 日本化学会の論文
著者
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Kakutani Tadaaki
Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto University
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Ikeda Tokuji
Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto University
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Senda Mitsugi
Department Of Agricultural Chemistry College Of Agriculture Kyoto University
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TORIYAMA Kazunobu
Department of Hokuriku Farming System Research, Hokuriku Research Center, National Agricultural Research Center
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Toriyama Kazunobu
Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University
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