Original contribution
Role of oxyradicals in the inactivation of catalase by ozone

https://doi.org/10.1016/0891-5849(88)90101-3Get rights and content

Abstract

The antioxidant enzymes, catalase and superoxide dismutase, are inactivated upon exposure to ozone. In this study, the mechanism of this inactivation was examined using catalase as a model system. The data show that the inactivation of catalase is dependent on ozone concentration, time of exposure, and pH. Loss of catalase activity is accompanied with loss of the heme spectra. Tiron, desferal-Mn, trolox-c, and pyruvate protect the enzyme against ozone inactivation. SOD is less effective due to its inactivation by ozone. On the other hand, alcohols do not provide significant protection. The data suggest the possible involvement of superoxide radicals in the inactivation of catalase by ozone.

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    Present address: Environmental and Community Medicine, Robert Woods Johnson Medical School, Rutgers University, NJ.

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