title: Ferrous ion-EDTA-stimulated phospholipid peroxidation. A reaction changing from alkoxyl-radical- to hydroxyl-radical-dependent initiation.
abstract: The stimulatory effect of ferrous salts on the peroxidation of phospholipids can be enhanced by EDTA when the concentration of Fe2+ in the reaction is greater than that of EDTA. Hydroxyl-radical scavengers do not inhibit peroxidation until the concentrations of Fe2+ and EDTA in the reaction are equal. Lipid peroxidation is then substantially initiated by hydroxyl radicals derived from a Fenton-type reaction requiring hydrogen peroxide. Superoxide radicals appear to play some role in the formation of initiating species.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004492:Edetic Acid / Q000494:pharmacology*; D005296:Ferrous Compounds / Q000494:pharmacology*; D005609:Free Radicals; D007501:Iron / Q000494:pharmacology*; D007502:Iron Chelating Agents / Q000494:pharmacology; D008054:Lipid Peroxides / Q000378:metabolism; D010084:Oxidation-Reduction; D010743:Phospholipids / Q000378:metabolism*
chemical_list: D005296:Ferrous Compounds; D005609:Free Radicals; D007502:Iron Chelating Agents; D008054:Lipid Peroxides; D010743:Phospholipids; D004492:Edetic Acid; D007501:Iron