Phytochemical screening of Colocasia gigantea and Colocasia affinis (Family: Araceae) using 1 H-NMR and 13 C-NMR techniques

Abstract Colocasia affinis and Colocasia gigantea are two of commonly found species under Colocasia genus. Folkloric use of these plants ascertains their ethnopharmacological importance and these plants are eaten as vegetables in several regions all around the world while Colocasia gigantea has planted as an ornamental plant too. Phytochemical screening of dichloromethane fractions of these plants using several separation techniques along followed by 1H-NMR and 13C-NMR techniques provide flavonoids and some other phyto compounds. However, in total 7 compounds were isolated from these plants i.e. penduletin (1), 7,8 -(3”,3”-dimethyl-pyrano)-4’-hydroxy flavonol (2), mixture of 7,8 -(3’’,3’’-dimethyl-pyrano)-4’-hydroxy flavonol from C. affinis and mixture of α-amyrin and β-amyrin (3), penduletin (5), monoglyceride of stearic acid (6) from C. gigantea.