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Role of the reductant substrates on the inactivation of horseradish peroxidase by m‐Chloroperoxybenzoic acid

Horseradish peroxidase reacts with H2O2 and other hydroperoxides to form Compound I, the first active enzymatic form. m‐Chloroperoxybenzoic acid, a xenobiotic hydroperoxide, acts as an oxidant substrate of horseradish peroxidase. However, this hydroperoxide is also a powerful inactivator of the enzyme and in this sense is more effective than H2O2. The coupled reductant substrates used in the peroxidatic reaction protect the enzyme from the inactivating process.