Phytochemical Investigations Of Bulbineabyssinica Bulbinenatalensis And Trachyandra Dwaricata

Phytochemical studies were carried out on Bulbine abyssinica , Bulbine natalensis andrnTrachyandra divaricata. All three plants belong to the family Asphodelaceae.rn8. abyssinica is the only Bulbine species knowen to occur in Ethiopia. 8. natalensisrnand T. divaricata are of South African origin.rnThe extract of the roots of 8. abyssinica afforded knipholone-6'-methyl ether (12)rnchrysophanol (14), knipholone anthrone (20), isoknipholone (22), knipholone (24), aloeemodinrn(2), 8-hydroxy-1-methylnaphtho[2,3-c]furan-4,9-dione (16) and 5,8-dihydroxy-1-rnmethylnaphtho[2,3-c]furan-4,9-dione (18).rnThe extract of the roots of 8. natalensis gave chrysophanol (14), knipholone anthronern( 20), isoknipholone (22), knipholone ( 24), aloe-emodin (2) , 8-hydroxy-1-rnmethylnaphtho[2,3-c]furan- 4, 9- dione (16) and 5,8-dihydroxy-1-methylnaphtho[2,3-rnc]furan-4,9-dione (18).rnThe occurence of chrysophanol (14), aloe-emodin ( 2), chryslandicin (48) and islandicinrn( 58 ) in the roots of T. divaricata was ascertained by direct TLC comparison withrnauthentic samples. No knipholone-type compounds were detected in the extract of thernroots of T. divaricata .rnThe structures of the compounds were elucidated based on their 1H NMR, IR, UV andrnmass spectra and in some cases, by direct comparison with authentic matrials.

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