1. ISOLATION AND CHARACTERIZATION OF SESQUITERPENE LACTONES FROM THE GENUS AMBERBOA by RUCHI SINGH AND DURGA K. MEWARA
Amberboa divaricata Kuntze (syn. Amberboa ramosa (Roxb.) Jafri = Volutarella divaricata Benth. et Hook.f. = Tricholepis procumbens Wight) belongs to the family Asteraceae and tribe-Cynareae. Asteraceae is the second largest family of the flowering plants and comprises of about 1100 genera and more than 20,000 species. Various sesquiterpene lactones especially guaianolides have been isolated from this genus. Some of these have a-methylene-g-lactone moiety which is essential for cytotoxic activity. The present work deals with the chemical investigation of the aerial parts of Amberboa divaricata and reports the isolation of lupeol acetate, stigmasterol, b-sitosterol, lupeol, aguerin-B, cynaropicrin, desacylcynaropicrin, betulinic acid and b-sitosterol-D-glucoside.
KEYWORDS: Amberboa divaricata Kuntze ; Asteraceae , Triterpenoids , Steroids.