GAMMA AND PULSE RADIOLYSIS STUDIES OF THE REACTION BETWEEN SUPEROXIDE IONS AND OXYHEMOGLOBIN-METHEMOGLOBIN SYSTEM期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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GAMMA AND PULSE RADIOLYSIS STUDIES OF THE REACTION BETWEEN SUPEROXIDE IONS AND OXYHEMOGLOBIN-METHEMOGLOBIN SYSTEM

Authors:	Christiane Ferradini Jacques Foos Lucien Gilles Didier Haristoy Jacques Pucheault

Institution:	Laboratoire de Chimie Physique, UniversitéRene Descartes, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France and DRA-SRIRMa, CEN Saclay BP n°2–91190 Gif sur Yvette, France

Abstract:	Abstract— 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 × 10³ M ^-1 s^-1. But a problem remains concerning the spectral characteristics of the product.

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