1.11.1.21 2 H2O2 - 1.11.1.21 2 H2O2 peroxidase activity 1.11.1.21 donor + H2O2 catalase activity 1.11.1.21 H2O2 - 1.11.1.21 H2O2 detoxification enzyme, protection against peroxides 1.11.1.21 isoniazid + H2O2 - 1.11.1.21 isoniazid + H2O2 activation of antituberculosis drug isonazid, catalytic mechanism 1.11.1.21 isoniazid + H2O2 pro-drug activation 1.11.1.21 o-dianisidine + H2O2 -