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“ Cimetidine and its complexes with Cu(II) and Fe(III) ions inhibited ferricytochrome c and NBT reduction even when metal chelators were added to the reaction medium.”
“At physiological pH values, low concentrations of Cu(II) complexes (0.025 mM) with Cim and CyHH could scavenge O2-, but high concentrations of these compexes (0.25 mM) yielded hydroxyl radicals (.OH) during dismutation of O2-.”