Now showing items 1-10 of 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.
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.
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: ...
Flavonoids from the seed pods of Tephrosia pumila
(University of Nairobi, 1989)
Inaddition to the known pumilaisoflavones A and B two further isoflavonoids have been isolated from the seed pods of Tephrosia pumila collected in Ethiopia. These have been characterized, on the basis of spectral analysis, ...
Chemotaxonomic survey of anthraquinones and pre-anthraquinones in roots of Aloe species
(University of Nairobi, 1995-04)
Root samples from 172 species of Aloe were surveyed by TLC and HPLC for the presence of anthraquinones and pre-anthraquinones. With the exception of the three species of the series Serrulatae, 1,8-Dihydroxyanthraquinones ...
Alkaloids of Teclea nobilis
(University of Nairobi, 1988)
A new furoquinoline alkaloid to which we have assigned the trivial name nobiline, and seven other quinonline alkaloids were isolated and identified from the leaves and fruits of Teclea nobilis, an African medicinal plant.
Flavonoids and isoflavonoids from Tephrosia fulvinervis and Tephrosia pentaphylla
(University of Nairobi, 1989)
From the roots, leaves and pods of Tephrosia pentaphylla three new 6-oxygenated rotenoids (dihydrostemonal, 9-demethyldihydrostemonal and 6-acetoxydihydrostemonal) were isolated and characterized. In addition six known ...
Anthraquinones and chemotaxonomy of the asphodelaceae
(University of Nairobi, 1994)
Phytochemical investigations on three genera of the Asphodelaceae, Aloe, KniphoJla and Bulbine showed that 1-methyl-8-hydroxyanthraquinones and anthrone-C-glycosides are characteristic constituents of the genus Aloe, ...