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'Redox Potentials' in keywords Facet   section ZfN Section C  [X]
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1984 (1)
1981 (1)
1Author    Berthold Kiefer, Helmut Sapper, WolfgangL. Ohm AnnRequires cookie*
 Title    The Influence of Amino Acid Ligands and Vitamin C on the Reduction Potential of Fe(III): Polarographie and Electron Spin Resonance Investigations  
 Abstract    The pH dependence o f Fe(III)-am ino acid com plexes has been studied polarographically and by means o f ESR spectroscopy. It could be shown that, at least, two com plexes exist: one with a low m olecular weight, ESR detectable at acid pH. and one with a high molecular w eight at alkaline pH, ESR non detectable. The half wave potential o f Fe (III) is lowered by am ino acid ligands. The redox interaction o f the Fe(III)-amino acid com plexes with vitam in C results in a decrease o f the ascorbyl radical concentration. Ascorbic acid also forms a com plex with Fe(III) as in­ dicated by a polarographic half wave potential near -0.55 V vs. S.C.E. at pH 7. 
  Reference    Z. Naturforsch. 39c, 102—106 (1984); received September 22 1983 
  Published    1984 
  Keywords    Ferrous Ions Ascorbic Acid, Redox-Potential, Polarography, ESR -Spectroscopy 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0102.pdf 
 Identifier    ZNC-1984-39c-0102 
 Volume    39 
2Author    WernerH. Kalus, WilliamG. FilbyRequires cookie*
 Title    Is there an Equilibrium between A scorbic and Dehydroascorbic Acids?  
 Abstract    The previously reported interaction between ascorbate monoanion and dehydroascorbic acid yielding semidehy-droascorbic acid has been shown to be therm odynam ically unfeasible and non-existent. N o evidence for radical for­ mation in the reinvestigation o f the reaction using ESR spectroscopy under careful exclusion o f air could be found. Our results show that the detection o f the free radical in earlier studies resulted from the reaction of ascorbate with traces of oxygen and/o r metals. 
  Reference    Z. Naturforsch. 36c, 1088—1090 (1981); received May 19 1981 
  Published    1981 
  Keywords    Ascorbic Acid, Dehydroascorbic Acid, Redox Potential, Free Radical, ESR 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-1088_n.pdf 
 Identifier    ZNC-1981-36c-1088_n 
 Volume    36