CAT and ulcer disease: In addition, salvianolic acid B (19) could increase the levels of SOD, catalase (CAT), and glutathione (GSH) in the colonic mucosa and decrease the levels of peroxidase myeloperoxidase (MPO) and MDA, which can improve free radical scavenging and antioxidant capacity, decrease lipid peroxidation, and attenuate colonic ulceration, thus improving UC [131].