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This work reports the nutritional potential and the antiradical activity of the cladodes of the Brazilian Opuntia monacantha Haw. (Cactaceae), as well the isolation of kaempferol and isorhamnetin through activity-guided fractionation from its active MeOH extract. TLC, HPLC-DAD and NMR techniques were used to detect and identify the compounds. The water (91.1%), ash, protein, fibre and lipid contents...