Browsing Faculty of Science & Technology (FST) by Author "Yenesew, Abiy"
Now showing items 41-55 of 55
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Natural Products from Plant Diversity and their Potential in Management of Neglected Diseases
(Department of Chemistry, University of Nairobi,, 2011)Conventionally, neglected diseases are considered as a group of 13 infectious diseases that are . endemic in the low income populations in the tropical developing world. They can be classified as those caused by trypanosomal ... -
neo-Clerodane diterpenoids from the leaf exudate of Dodonaea angustifolia
(University o nairobiCollege of biological and physical science, 2010)Phytochemical investigation of the leaf surface exudate of Dodonaea angustifolia L.f. yielded two new neo-clerodane diterpenes, neo-clerodan-3,13-dien-16,15:18,19-diolide (mkapwanin) and 15-methoxy-neo-clerodan-3,13-dien ... -
Op-37 Flavonoids from erythrina burttii and erythrina sacleuxii
(Department of Chemistry, University of Nairobi,, 2000)The root and stem bark of Erythrina species are widely used in traditional medicine for the treatment of microbial infections: In our interest on the phytochemistry of Erythrina species of Kenya, we have isolated several ... -
Op-38 further diterpenes from the leaf exudate of psiadia punctulata.
(Department of Chemistry, University of Nairobi,, 2001) -
Pentadihydronaphthoquinones A-D from the roots of Pentas bussei
(University of Nairobi, 2012) -
A pre-anthraquinone derivative from aloe graminicole
(Department of Chemistry, University of Nairobi,Ruhr Universitaet Bochum, Lehrstuhl fuer Strukturchemie Postfach, 2009)Atrochrysone and torosachrysone play an important role in the biosynthesis of the common polyketide-derived anthraquinones, such as emodin and physcion [1]. We report here for the first time the occurrence in nature of ... -
(R)-Prechrysophanol from Aloe graminicola
(Department of Chemistry, University of NairobiUniversitaet Hannover, Institut fuer Organische Chemie, Germany, 1993)From the subterranean stem of Aloe graminicola, a new pre-anthraquinone named prechrysophanol was isolated. Chrysophanol, helminthosporin, (R)-aloesaponol I, (R)-aloesaponol II, aloesaponarin I, aloesaponarin II and laccaic ... -
Rotenoids, isoflavones and chalcones from the stem bark of Millettia usaramensis subspecies usaramensis
(University of NairobiDepartment of Chemistry, University of Nairobi, 1998-01)From the stem bark of Millettia usaramensis subsp. usaramensis four new 12a-hydroxyrotenoids with the unusual trans B/C ring junction ((+)-12a-epimillettosin, (+)-usararotenoid-A, (+)-12-dihydrousararotenoid-A, and ... -
Simultaneous determination of iron(III) and vanadium(V) with N-phenylcinnamohydroxamic acid and thiocyanate by extraction-spectrophotometry
(University of NairobiCollege of Biological and Physical Sciences,University of NairobiDepartment of Chemistry, Addis Ababa University, 1985)N-Phenylcinnarnohydroxamic acid (PCHA) reacts with iron(III) and vanadium(V) in the presence of thiocyanate to form water-insoluble orange and green complexes, respectively. The iron(III)-PCHA and vanadium(V)-PCHA-thiocyanate ... -
(+)-Tephrodin - A New Flavone from Tephrosia purpurea
(1972)Tephrosia species are widely used in East African traditional medicinal practice to treat various infectious diseases. In our continued search for antiplasmodial agents from Tephrosia species found in Kenya a new ... -
Terpurinflavone: An antiplasmodial flavone from the stem of Tephrosia Purpurea
(Elsevier B.V.Department of Chemistry,University of NairobiUnited Stares Army Medical Research Unit-KenyaDepartment of Biochemistry, Jomo Kenyatta University of Agriculeure and TechnologyInsrieur fur Chemie, Universitat Potsdam,School of Pharmacy, University of Nairobi,, 2011)The stem extract of Tephrosia purpurea showed anti plasmodial activity against the D6 (chloroquinesensitive) and W2 (chloroquine-resistant) strains of Plasmodium /aldparum with 1(50 values of 10.47 ± 2.22 f.Lg/mland 12.06 ... -
Three dimeric anthracene derivatives from the fruits of Bulbine abyssinica. Tetrahedron 61, 2667
(Department of Chemistry, 2005) -
Three steroidal alkaloids from Buxus hildebrandtii
(University of NairobiDepartment of Chemistry, Addis Ababa UniversityCollege of Biological and Physical Sciences,University of NairobiResearch Institute of Chemistry, University of Karachi, 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: ... -
Two new isoflavones from millettia dura
(Department of Chemistry, University of Nairobi,, 2010)The genus Millettia belongs to the family Fabaceae. It is represented by more than 200 species and is, found widely distributed in tropical Africa, Australia and Asia. Previous chemical investigationsof a number" of ... -
A xanthone and a phenylanthraquinone from the roots of Bulbine frutescens, and the revision of six seco-anthraquinones into xanthones
(University of Nairobi, 2014)Phytochemical investigation of the dichloromethane/methanol (1:1) extract of the roots of Bulbine frutescens led to the isolation of a new xanthone, 8-hydroxy-6-methylxanthone-1-carboxylic acid (1) and a new phenylanthraquinone, ...
