The photochemical oxidation of ascorbic acid in solutions containing oxalic acid. II.—Mechanism of the reaction

1956 ◽  
Vol 7 (2) ◽  
pp. 120-124 ◽  
Author(s):  
L. H. Lampitt ◽  
L. C. Baker ◽  
E. Wittenberg
Keyword(s):  
Ascorbic Acid ◽  
Oxalic Acid ◽  
Photochemical Oxidation ◽  
Mechanism Of The Reaction

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.

scholarly journals THE METABOLISM OF ASCORBIC ACID-1-C14 AND OXALIC ACID-C14 IN THE RAT

1955 ◽  
Vol 216 (2) ◽  
pp. 539-548
Author(s):  
Constance O'H. Curtin ◽  
C.G. King
Keyword(s):  
Ascorbic Acid ◽  
Oxalic Acid

Ascorbic Acid Stability in Ground Asparagus Samples and in Oxalic Acid Extracts

1995 ◽  
Vol 60 (6) ◽  
pp. 1282-1283
Author(s):  
MARÍA J. ESTEVE ◽  
ROSAURA FARRÉ ◽  
ANA FRÍGOLA
Keyword(s):  
Ascorbic Acid ◽  
Oxalic Acid ◽  
Acid Stability

scholarly journals Metabolic Conversion of l-Ascorbic Acid to Oxalic Acid in Oxalate-accumulating Plants

1975 ◽  
Vol 56 (2) ◽  
pp. 283-285 ◽  
Author(s):  
Joan C. Yang ◽  
Frank A. Loewus
Keyword(s):  
Ascorbic Acid ◽  
Oxalic Acid ◽  
Metabolic Conversion
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