Abstract
An in vitro bioassay-guide revealed that the methanolic extract of the aerial parts of Cometes abyssinica had considerable inhibitory activity against colon (HCT-116) and hepatocellular (HepG2) carcinoma cell lines with IC50 24.4 and 29.9 mu g/mL, respectively, compared to the drug reference Cisplatin. On the other hand, all studied extracts exhibited weak antioxidant activities using the DPPH scavenging assay with IC50 values between 543-826.4 mu g/mL. Phytochemical investigation of the methanol and ethyl acetate extracts of C. abyssinica led to the isolation of five flavonoid compounds: Formononetin 1, Daidzein 2, Eriodictyol 3, Taxifolin 4, and kaempferitrin 5. The chemical structure of the isolated compounds was identified based on their physicochemical and spectroscopic analyses.