Ulcerative colitis (UC) comprises those conditions characterized by a tendency for chronic relapsing remitting inflammatory disease of the large intestine . The uncertainty of the etiologic factors of ulcerative colitis and the failure of current treatment strategies to control many cases of this disease make a strong stimulus to find out a new relatively safe and effective modality of treatment .Studies pointed to overproduction of free radicals and decreased antioxidant capacity in the pathogenesis... Mehr