The Influence of Amino Acid Ligands and Vitamin C on the Reduction Potential of Fe(III): Polarographie and Electron Spin Resonance Investigations

The pH dependence of Fe(III)-amino acid complexes has been studied polarographically and by means of ESR spectroscopy. It could be shown that, at least, two complexes exist: one with a low molecular weight, ESR detectable at acid pH. and one with a high molecular w eight at alkaline pH, ESR non dete...

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Veröffentlicht in:Zeitschrift für Naturforschung C. A journal of biosciences 1984-02, Vol.39 (1), p.102-106
Hauptverfasser: Kiefer, Berthold, Sapper, Helmut, Lohmann, Wolfgang
Format: Artikel
Sprache:eng
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Zusammenfassung:The pH dependence of Fe(III)-amino acid complexes has been studied polarographically and by means of ESR spectroscopy. It could be shown that, at least, two complexes exist: one with a low molecular weight, ESR detectable at acid pH. and one with a high molecular w eight at alkaline pH, ESR non detectable. The half wave potential of Fe (III) is lowered by amino acid ligands. The redox interaction of the Fe(III)-amino acid complexes with vitamin C results in a decrease of the ascorbyl radical concentration. Ascorbic acid also forms a complex with Fe(III) as in­dicated by a polarographic half wave potential near -0.55 V vs. S.C.E. at pH 7.
ISSN:0939-5075
1865-7125
DOI:10.1515/znc-1984-1-217