Abstract
Two forms of catalase (H 2O 2:H 2O 2 oxidoreductase, EC 1.11.1.6) activity, soluble and lipid-bound, exist in the total homogenate as well as in mitochondria, microsomes and plasma membranes of mice liver, rat liver and hepatomas. The lipid-bound catalase activity is revealed by the treatment of the tissue with n- butanol . An inverse correlation between morphological, immunochemical characteristics (reflecting the extent of malignancy) of the hepatomas studied and the activity of the two forms of catalase was found. The nature of two forms of catalase activity is discussed. One infers that experimental data available do not favour the view of their being isozymes.
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