We 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: \ud \ud 1. 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.\ud \ud 2. 2.|Methanol and ethanol radicals which reduce all three hemoproteins with a yield of (100 ± 5)%. This reduction is a normal bimolecular reaction.\ud \ud 3. 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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