The thermodynamic properties of some commonly used oxidation-reduction mediators, inhibitors and dyes, as determined by polarography
- 28 February 1981
- journal article
- research article
- Published by Elsevier BV in Biochimica et Biophysica Acta (BBA) - Bioenergetics
- Vol. 635 (1), 132-148
- https://doi.org/10.1016/0005-2728(81)90014-1
Abstract
The oxidation-reduction midpoint potentials (Em) of the following compounds have been measured in the range of pH from 3 to 12 by polarography: methyl viologen; benzyl viologen; 2-hydroxy-1,4-naphthoquinone; 2-hydroxy-1,4-anthraquinone; N,N,N′,N′,-tetramethyl-p-phenylenediamine;2,3,5,6-tetramethyl-p-phenylenediamine; phenazine; N-methylphenazonium methosulfate; N-methylphenazonium sulfonate methosulfate; N-ethylphenazonium ethosulfate; pyocyanine; neutral red; safranin; phenol red; chlorophenol red; cresol red; bromocresol purple; 2,5-dibromo-3-methyl-6-isopropylbenzoquinone and 5-n-undecyl-6-hydroxy-4,7-dioxobenzothiazole. Many of these previously assumed to have a simple behavior in this range have proven to be rather more complicated, and several anomalous observations have been reconciled.Keywords
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