CAT and chronic obstructive pulmonary disease: Comparative serum content of oxidants (MDA, lipid hydroperoxide), antioxidants (Vit C, GSH), cholesterol, TG, and HDL together with the activity of burst enzymes (CAT, SOD, and GST) between COPD patients and controls at day 0 (i.e., on the set of experiment) is presented in Table 3.