Although the mechanism by which cucurbitacin glycosides act as antioxidants is not well understood, it is generally believed that the beneficial properties of cucurbitacin glycosides are due to their ability to directly interact with reactive oxygen species . The current study shows for the first time that CLG is an effective antioxidant when tested using both ORAC and FRAP assays. These results suggest that CLG could be used to suppress oxygen cellular metabolites. Previous data have demonstrated that the cucurbitacin E glycoside exhibits antioxidant properties, probably through the involvement of a direct scavenging effect on several free radicals . On the other hand, NO can freely interact with oxygen metabolites to yield nitrosating species, and the formation of nitrosamines may be important in the development of colorectal cancer in ulcerative colitis. High levels of nitrosamines have been demonstrated in rectal dialysates of patients with active inflammatory bowel disease . Therefore, the obtained results warrant further research for the clinical application of CLG as chemopreventive agents for advanced ulcerative colitis patients.