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GAMMA AND PULSE RADIOLYSIS STUDIES OF THE REACTION BETWEEN SUPEROXIDE IONS AND OXYHEMOGLOBIN‐METHEMOGLOBIN SYSTEM
Author(s) -
Ferradini Christiane,
Foos Jacques,
Gilles Lucien,
Haristoy Didier,
Pucheault Jacques
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07031.x
Subject(s) - methemoglobin , radiolysis , chemistry , formate , disproportionation , photochemistry , hydrogen peroxide , superoxide , ion , aqueous solution , inorganic chemistry , hemoglobin , catalysis , organic chemistry , enzyme
— The radiolytic studies of oxyhemoglobin or methemoglobin in neutral aerated aqueous solutions with formate ions, lead to three conclusions: The oxidation of oxyhemoglobin by O ‐ 2 is not important. The observed low oxidation yield is probably due to the slow reaction with hydrogen peroxide produced by O ‐ 2 disproportionation. The reduction of methemoglobin in γ radiolysis reaches a plateau which could be explained by structural considerations. The reduction of methemoglobin by O ‐ 2 ions, if it occurs, is relatively slow: k = 1.4 × 10 3 M ‐1 s ‐1 . But a problem remains concerning the spectral characteristics of the product.