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  • Title: The reaction of ferrous leghemoglobin with hydrogen peroxide to form leghemoglobin(IV).
    Author: Aviram I, Wittenberg A, Wittenberg JB.
    Journal: J Biol Chem; 1978 Aug 25; 253(16):5685-9. PubMed ID: 670221.
    Abstract:
    Ferrous leghemoglobin reacts with hydrogen peroxide to form the stable product, leghemoglobin(IV). The reaction follows second order kinetics (k = 2.24 X 10(4) M-1 S-1 at 20 degrees C) and may be regarded as a single-step, two-electron oxidation. Ferric leghemoglobin is not an intermediate. The oxidation state of leghemoglobin(IV) is established by reductive titration with dithionite; 2 eq of dithionite are required to convert 1 mol of leghemoglobin(IV) to ferrous leghemoglobin. An outstanding property of leghemoglobin(IV) is its stability, little change is noted after 12 h at 25 degrees C. Leghemoglobin(IV) differs from the higher oxidation states of other hemoglobins and myoglobins in that it does not react with hydrogen peroxide to form the oxygenated protein.
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