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ADP-iron As A Fenton Reactant: Radical Reactions Detected By Spin Trapping, Hydrogen Abstraction, And Aromatic Hydroxylation.

J. Gutteridge, I. Nagy, L. Maidt, R. Floyd
Published 1990 · Chemistry, Medicine

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A mixture of ADP, ferrous ions, and hydrogen peroxide (H2O2) generates hydroxyl radicals (OH) that attack the spin trap DMPO (5,5-dimethyl-pyrollidine-N-oxide) to yield the hydroxyl free radical spin-adduct, degrade deoxyribose and benzoate with the release of thiobarbituric acid-reactive material, and hydroxylate benzoate to give fluorescent products. Inhibition studies, with scavengers of the OH radical, suggest that the behavior of iron-ADP in the reaction is complicated by the formation of ternary complexes with certain scavengers and detector molecules. In addition, iron-ADP reacting with H2O2 appears to release a substantial number of OH radicals free into solution. During the generation of OH radicals the ADP molecule was, as expected, damaged by the iron bound to it. Damage to the iron ligand in this way is not normally monitored in reaction systems that use specific detector molecules for OH radical damage. Under certain reaction conditions the ligand may be the major recipient of OH radical damage thereby leading to the incorrect assumption that the iron ligand is a poor Fenton reactant.
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