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[Multiphasic character of the kinetics of cytochrome P-450 destruction in microsomal LM2- and LM4-forms in the reaction with cumene hydroperoxide].

Cytochrome P-450 destruction kinetics by cumene hydroperoxide has been studied in LM2 and LM4 microsomal and purified forms. Three destruction phases of cytochrome P-450 were shown to be observed irrespective of the source and integration degree, cytochrome P-450 pseudomonomolecular consumption rate constants being dependent in a complex way upon the cumene hydroperoxide initial concentration. The radical character of cytochrome P-450 destruction was proved by experiments with 1-naphtol. The mechanism of radicals formation is discussed.