CAT and hypertensive disorder: Some clinical studies have shown increased reactive oxygen species (ROS) production in hypertension.6 These ROS are formed via leakage from the mitochondrial electron transport chain in all cells during normal aerobic metabolism.7 Several antioxidant enzymes such as copper zinc superoxide dismutase (CuZn-SOD), glutathione peroxidase (GPX) and catalase (CAT) have been reported which have the ability of detoxification of ROS including superoxide anion (O2-) and hydrogen peroxide (H2O2).8