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Superoxide dismutase exerted a pronounced inhibitory effect upon xanthine oxidase-mediated reduction of iron in ferritin, ferric chloride, or ferric ADP. Maximal inhibition was observed when the superoxide dismutase concentration was only about 1% of that found in normal porcine liver. These observations indicate that superoxide anion radical is an intermediate in the reduction of iron by xanthine oxidase in vitro but not in vivo.

The role of superoxide anion radical in the reduction of ferritin iron by xanthine oxidase.