CAT and Alzheimer disease: Compared with control, the contents of SOD (Figure 5(a)), GSH-Px (Figure 5(c)), CAT (Figure 5(e)), and T-AOC (Figure 5(f)) in AD model cells were significantly reduced (P < 0.05), whereas AChE (Figure 5(d)) activity was enhanced (P < 0.05) and MDA (Figure 5(b)) level was increased (P < 0.01) in AD model cells.