METHODS AND RESULTS:
Ten compounds, cinnamic acid (1); dihydrochrysine (2); beta-sitosterol (3); six styryllactones, (+)-3-acetylaltholactone (4), Goniotriol (5), (+)-altholactone (6), (+)-goniofufurone (7), 9-deoxygoniopypyrone (8), howiinin A (9); and an aporphine alkaloid; (-)-nordicentrine (10) were isolated from flowers of Goniothalamus laoticus. Among these, compounds 1, 3-5, 8-10 are first isolated from the Goniothalamus laoticus. Besides, compound 10 is the first report from the Goniothalamus genus. The isolated compounds were evaluated in antiplasmodial, antimycobacterial and anticancer cell lines tests.
CONCLUSIONS:
Compounds 4-6 and 10 exhibited antiplasmodial activity against Plasmodium falciparum (IC(50) 2.6, 7.9, 2.6 and 0.3 microg/mL, respectively), while 5, 6, 9 and 10 showed antimycobacterial activity against Mycobacterium tuberculosis (MIC 100, 6.25, 6.25 and 12.5 microg/mL, respectively). In addition, compounds 4-10 showed cytotoxicity against cancer cells, KB, BC1, NCI-H187, and MCF-7 with IC(50) ranging from 0.4 to 22.7 microg/mL. |