Chemical constituents and antioxidant activity from leaves extracts of terminalia fogiafolia mart. et zucc

CHEMICAL CONSTITUENTS and ANTIOXIDANT ACTIVITY FROM LEAVES EXTRACTS of Terminalia fagifolia Mart. et Zucc. Phytochemical investigation of ethanolic leaves extracts of T. fagifolia led to the isolation of (+)-catechin, sitosterol-3-O-beta-D-glucopyranoside, alpha- and beta-tocopherol, a mixture of lupeol, alpha- and beta-amyrin, sitosterol and a mixture of glicosid flavonoids (CP-13). The structures of these compounds were identified by (1)H and (13)C NMR spectral analysis and comparison with literature data. Absolute configuration of the catechin was determinate by circular dichroism. Antioxidant activity (EC(50)), evaluated by 2,2-diphenyl-1-picrylhidrazyl (DPPH) assay system, decreased in the order: (+)-catechin > hydroalcoholic fraction > CP-13 > aqueous fraction > EtOH extract.