Activation and reaction volumes for redox reactions of horse-heart cytochrome c with inorganic reagents

1982 ◽  
Vol 74 ◽  
pp. 343 ◽  
Author(s):  
Karel Heremans ◽  
Marc Bormans ◽  
Johan Snauwaert ◽  
Herman Vandersypen
Keyword(s):  
Cytochrome C ◽  
Redox Reactions ◽  
Horse Heart Cytochrome ◽  
Reaction Volumes ◽  
Horse Heart Cytochrome C

Kinetics and mechanism of the reaction between oxidized cytochrome c and ascorbic acid

1991 ◽  
Vol 56 (2) ◽  
pp. 478-490 ◽  
Author(s):  
Joaquin F. Perez-Benito ◽  
Conchita Arias
Keyword(s):  
Ascorbic Acid ◽  
Cytochrome C ◽  
Redox Reactions ◽  
Arrhenius Equation ◽  
Horse Heart Cytochrome ◽  
First Order ◽  
Acidic Form ◽  
Ph Range ◽  
Horse Heart Cytochrome C ◽  
Mechanism Of The Reaction

The reaction between horse-heart cytochrome c and ascorbic acid has been investigated in the pH range 5.5 – 7.1 and at 10.0 – 25.0 °C. The rate shows a first-order dependence on the concentration of cytochrome c, it increases in a non-linear way as the concentration of ascorbic acid increases, it increases markedly with increasing pH and, provided that the ionic strength of the medium is high enough, it fulfills the Arrhenius equation. The apparent activation energy increases as the pH of the solution increases. The results have been explained by means of a mechanism that includes the existence of an equilibrium between two forms (acidic and basic) of oxidized cytochrome c: cyt-H+ -Fe3+ + OH- cyt -Fe3+ + H2O, whose equilibrium constant is (6.7 ± 1.4). 108 at 25.0 °C, the acidic form being more reducible than the basic one. It is suggested that there is a linkage of hydrogenascorbate ion to both forms of cytochrome c previous to the redox reactions. Two possibilities for the oxidant-reductant linkage (binding and adsorption) are discussed in detail.

ChemInform Abstract: Total Synthesis of Horse Heart Cytochrome c

ChemInform ◽  
2010 ◽  
Vol 23 (27) ◽  
pp. no-no
Author(s):  
C. DI BELLO ◽  
C. VITA ◽  
L. GOZZINI
Keyword(s):  
Cytochrome C ◽  
Total Synthesis ◽  
Horse Heart Cytochrome ◽  
Horse Heart Cytochrome C
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