SummaryWe have studied the reaction of ferricytochrome c, methemoglobin and metmyoglobin with OH and alcohol radicals {methanol, ethanol, ethylene glycol and glycerol). These radicals can be divided into three groups:1. The OH radicals which reduce the ferricytochrome c with a yield of (30 _+ 10)% and methemoglobin with a yield of (40 + 10)%. They do not reduce metmyoglobin. The reduction is not a normal bimolecular reaction but is most probably an intramolecular electron transfer of a protein radical.2. Methanol and ethanol radicals which reduce all three hemoproteins with a yield of (100 + 5)%. This reduction is a normal bimolecular reaction.3. Glycerol radicals which do not reduce the ferrihemoproteins under our experimental conditions. Ethylene glycol radicals do not reduce ferricytochrome c and metmyoglobin but they do reduce methemoglobin with a yield of (30 + 10)%.
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