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- W2020659838 abstract "The reduction of methemoglobin by cobaltocytochrome c (Cocyt c) has been measured using nine mediators of different half-reduction potentials, Em, 7. The rate increases with the increase of Em, 7 for the mediator but dropped precipitously when it becomes more positive than the Em, 7 for the methemoglobin/hemoglobin couple. The reaction is most efficient with phenazine methosulfate, therefore it was studied in detail. The reaction is first order in the concentrations of Cocyt c and phenazine methosulfate. The average second-order rate constant for Cocyt c+ phenazine methosulfate (M) Cocyt c++ M−. is 2.9 × 104 M−1 s−1 at 25 °C, 0.1 M phosphate pH 7.0. There is a slight negative temperature dependence of k1 at low temperature; at higher temperatures the process has ΔH+≈ 27 kJ mol−1 and ΔS+≈– 75 J mol−1 K−1. The effect of anions reflects the dependence of Em,7 for the methemoglobin/hemoglobin couple with various anions. There is no significant effect on k1 by the addition of inositol hexakisphosphate. The variation of k1 with pH is complicated. The experimental rate constants are compared with values calculated with the theory of nonadiabatic multiphonon process of electron tunneling." @default.
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- W2020659838 title "Reduction of Methemoglobin by Cobaltocytochrome c Catalyzed by Mediators" @default.
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- W2020659838 doi "https://doi.org/10.1111/j.1432-1033.1978.tb12443.x" @default.
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