Abstract
1. 1. The nonenzymatic reduction of metmyoglobin by NADH or NADPH occurs rapidly in the presence of EDTA or MnCl 2 under aerobic but not under anaerobic conditions. The reduction is accelerated by the addition of H 2O 2 and is completely inhibited by catalase. 2. 2. The oxidation of NADH by molecular oxygen in the presence of EDTA is negligible. This oxidation is increased catalytically upon the addition of metymyoglobin and is inhibited by catalase. 3. 3. The reduction of methemoglobin by NADH or NADPH can take place in the presence of MnCl 2; EDTA is not effective in methemoglobin systems. 4. 4. In the presence of FMN, the reduction of metmyoglobin by NADH or NADPH does not require the production of peroxide.
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