The catalytic activity of horseradish peroxidase was investigated upon oxidation of the bilirubin-albumin complex (10(-5)-10(-4) M; BR: SA = 1: 1.5 mol/mol) by dissolved oxygen to biliverdin and other components. The process can be described by the Michaelis-Menten equation with Km = 14.4 microM and Vmax = 0.12 microM/min, if HRP = 3.1 x 10(-8) M. Oxidation is supposed to proceed in the triple complex--peroxidase: albumin: bilirubin.

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