Now showing items 1-10 of 35
Flemingins G–O, Cytotoxic and Antioxidant Constituents of the Leaves of Flemingia grahamiana
The known flemingins A–C (1–3) and nine new chalcones, named flemingins G–O (4–12), along with deoxyhomoflemingin (13) and emodin (14) were isolated from a leaf extract of Flemingia grahamiana. The isolated chalcones were ...
Constituents of the Roots and Leaves of Ekebergia capensis and Their Potential Antiplasmodial and Cytotoxic Activities
A new triterpenoid, 3-oxo-12β-hydroxy-oleanan-28,13β-olide (1), and six known triterpenoids 2–7 were isolated from the root bark of Ekebergia capensis, an African medicinal plant. A limonoid 8 and two glycoflavonoids 9–10 ...
Knipholone anthrone from Kniphofia foliosa
(University of Nairobi, 1993-11)
A new anthrone named knipholone anthrone was isolated from the stem of Kniphofia foliosa. Its structure was determined by spectral analysis as well as conversion to knipholone.
An anthrone, an anthraquinone and two oxanthrones from Kniphofia foliosa
(University of Nairobi, 1994)
The compounds isoknipholone, isoknipholone anthrone, foliosone and isofoliosone were isolated from the stem of Kniphofia foliosa and their structures determined by spectral analyses. In addition, the known compounds, ...
Chemotaxonomic significance of anthraquinones in the roots of asphodeloideae (asphodelaceae)
The distribution of seven anthraquinones in the roots of some 46 species belonging to the genera Asphodelus, Asphodeline, Bulbine, Bulbinella and Kniphofia was studied by TLC and HPLC, 1,8-Dihydroxyanthraquinones based on ...
The chemotaxonomic significance of root anthraquinones and pre-anthraquinones in the genus Lomatophyllum (asphodelaceae)
(University of Nairobi, 1995-11)
The roots of seven species of Lomatophyllum were analysed by TLC and HPLC for the presence of nine different anthraquinones and pre-anthraquinones which are all known to be characteristic constituents of the subterranean ...
A comparative study of anthraquinones in rhizomes of Kniphofia species
(University of Nairobi, 1988-01-14)
The anthraquinone content of eight kniphofia species was compared using reversed phase HPLC method coupled with a photodiode array detector.
A pre-anthraquinone derivative from aloe graminicole
Atrochrysone and torosachrysone play an important role in the biosynthesis of the common polyketide-derived anthraquinones, such as emodin and physcion . We report here for the first time the occurrence in nature of ...
Three steroidal alkaloids from Buxus hildebrandtii
(University of Nairobi, 1990)
From the leaves of Buxus hildebrandtii three new steroidal alkaloids have been isolated and their structures determined by spectroscopic analysis. The following derived names have been suggested for these new alkaloids: ...