Browsing Research articles (Dept of Chemistry) by Title
Now showing items 21-40 of 85
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Bufadienolides and other constituents of Urginea sanguinea
(Georg Thieme Verlag, https://www.thieme.com/books, 1997)Fresh bulbs of Urginea sanguinea yielded stigmasterol, phloroglucinol, phloroglucinol 1-β-D-glucopyranoside (phlorin), scillaren A, a novel compound 5α-4,5-dihydroscillaren A (1), salicylic acid, and 3-hydroxy-4-methylbenzoic ... -
Chalcones and other constituents of Dorstenia prorepens and Dorstenia zenkeri
(Elsevier Science Ltd. www.elsevier.com/locate/phytochem, 2002)The twigs of Dorstenia prorepens furnished the digeranylated chalcone, 5,30-(3,7-dimethyl-2,6-octadienyl)-3,4, 20,40-tetrahydroxychalcone while Dorstenia zenkeri yielded the 30,40-(3-hydroxy-2,2-dimethyldihydropyrano)-4 ... -
Characterization and Compositional Studies of the Oils from Some Legume Cultivars, Phaseolus vulgaris, Grown in Southern Africa
(AOCS Press., 2004)Seed oils from six legume cultivars of Phaseolus vulgaris, grown in the Kingdom of Lesotho, were extracted and their physicochemical properties and FA compositions were determined in order to compare their dietary lipids ... -
Chemical constituents of Treculia acuminata and Treculia africana (Moraceae)
(Elsevier Ltd. www.elsevier.com/locate/biochemsyseco, 2007)Three species of the genus Treculia namely, Treculia acuminata Baill., Treculia africana Decne ex. Treà ´cul and Treculia obovoidea N.E.Br. grow in the humid rain forest of southwest Cameroon. They are also widely ... -
Cyclic voltammetric studies of tris(alkylisocyanide)-bis(triarylphosphine)cobalt(II) and tris-(alkylisocyanide)bis(triarylphosphine)cobalt(I) complexes exhibiting synthetic interconvertability
(NRC Research Press, http://www.nrcresearchpress.com/loi/cjc, 2003)Nine pairs of corresponding [CoI(CNR)3(PR3 ′ )2]X, [CoII(CNR)3(PR3 ′ )2]X2 complexes — where X = ClO4, BF4; CNR = CNCMe3, CNCHMe2, CNC6H11, CNCH2Ph; PR3′ = PPh3, P(C6H4Me-p)3, P(C6H4OMe-p)3 — have been studied using cyclic ... -
Deltamethrin in sediment samples of the Okavango Delta, Botswana
(Water SA Pretoria; Water Research Commission; http://www.wrc.org.za/, 2006-10)Deltamethrin concentrations were determined in 35 sediment samples collected from three different habitats: channel, lagoon and pool sites from Xakanaxa in the Okavango Delta, NW Botswana. The samples were Soxhlet-extracted ... -
Dinklagins A, B and C: three prenylated flavonoids and other constituents from the twigs of Dorstenia dinklagei
(Elsevier Science Ltd. www.elsevier.com/locate/phytochem, 2002)Three prenylated flavonoids, dinklagins A, B and C identified, respectively, as ( )-6-(3,3-dimethylallyl)-7-hydroxy-6000, 6000-dimethylchromeno-( 40,30,2000,3000)-flavanone, (+)-5,40,500x-trihydroxy-600,600-dimethylchro ... -
Diprenylated chalcones and other constituents from the twigs of Dorstenia barteri var. subtriangularis
(Elsevier Ltd; www.elsevier.com/locate/phytochem, 2003)The twigs of Dorstenia barteri var. subtriangularis yielded three diprenylated chalcones: ( )-3-(3,3-dimethylallyl)-50-(2-hydroxy-3- methylbut-3-enyl)-4,20,40-trihydroxychalcone, (+)-3-(3,3-dimethylallyl)-40,50-[2000-(1 ... -
Diterpenoids from the stem bark of Croton zambesicus
(Elsevier Science Ltd. www.elsevier.com/locate/phytochem, 2002)Three clerodane diterpenoids, crotozambefurans A, B and C were isolated from the stem bark of Croton zambesicus together with the known clerodane crotocorylifuran and two trachylobanes: 7b-acetoxytrachyloban-18-oic acid ... -
Effect of erythrinaline alkaloids from Erythrina lysistemon on human recombinant caspase-3
(Academic Journals, https://academicjournals.org/, 2018-04-22)Prostate cancer is a leading killer disease among men all over the world. Inducing apoptosis (programmed cell death) is a strategic chemotherapeutic approach. Caspase-3 is a key effector of apoptosis, and its activation ... -
An efficient synthesis of flavans from salicylaldehyde and acetophenone derivatives
(Elsevier Science Ltd, http://www.elsevier.com/locate/tetlet, 2011)An efficient total synthesis of flavans from the reactions of salicylaldehyde and acetophenone derivatives is reported. The synthesis involves preparation of chalcones through an aldol reaction followed by reduction of ... -
Electrospray Liquid Chromatography–Mass Spectrometry of the Leaf Extract of Rhamnus prinoides
(John Wiley & Sons, Ltd., 1999)Three naphthalenic derivatives, four flavonoids and two of the four anthraquinones previously isolated from the leaves of Rhamnus prinoides were successfully ionised under electrospray ionisation conditions. These compounds ... -
Epoxylignans from the seeds of Centaurea cyanus (Asteraceae)
(Elsevier Ltd. www.elsevier.com/locate/biochemsyseco, 2004)A study focusing on Centaurea cyanus L. (family: Asteraceae alt. Compositae), otherwise known as "cornflower" or "bachelor's button. The seed is purchased from B & T World Seeds sarl, Pauguignan, 34210 Olonzac, France and ... -
Erythrinaline Alkaloids and Antimicrobial Flavonoids from Erythrina latissima
(Georg Thieme Verlag, https://www.thieme.com/books-main/biochemistry/product/3494-planta-medica, 2002)The seed pods of Erythrina latissima yielded erysotrine, erysodine, syringaresinol, vanillic acid, a new erythrina alkaloid, (+)-10,11-dioxoerysotrine, which was lethal to brine shrimp and 2-(5′-hydroxy-3′-methoxy ... -
Evaluation of methods for the isolation, detection and quantification of cyanobacterial hepatotoxins
(Elsevier Ltd. www.elsevier.com/locate/aquatox, 2006)Cyanobacterial hepatotoxins such as microcystins and nodularins have been responsible for the poisoning of both animals and humans who ingest or come into contact with toxic blooms. They are extremely stable in water due ... -
Evaluation of methods for the isolation, detection and quantification of cyanobacterial hepatotoxins
(Elsevier Ltd. http://www.elsevier.com/wps/find/journaldescription.cws_home/505509/description#description, 2006)Cyanobacterial hepatotoxins such as microcystins and nodularins have been responsible for the poisoning of both animals and humans who ingest or come into contact with toxic blooms. They are extremely stable in water due ... -
Examination of Blepharis aspera as a possible Cu–Ni indicator plant
(South African Journal of Science, 2007)BLEPHARIS ASPERA WAS COLLECTED FROM A copper–nickel mineralized area in Botswana and examined as a possible Cu–Ni indicator plant for biogeochemical prospecting. Different plant parts and the host soils were analysed using ... -
Fatty acid composition and antimicrobial activity of Baphia massaiensis seed oil
(SCIENCEDOMAIN International, http://www.journaljocamr.com/index.php/JOCAMR/index, 2017-04-03)Aims: The seed oil composition of Baphia massaiensis seeds was determined using 1H NMR and GC-MS techniques. The seed oil was also screened for antimicrobial activity. Study Design: The study was designed to determine ... -
Fire and its influence on microbial community structure and soil biochemical properties in the Okavango Delta, Botswana
(Academic Journals. http://www.academicjournals.org/SRE, 2007)The influence of wild fires on microbial community structure, soil organic matter, sulphur oxidising and nitrifying microbial populations in the floodplains of the Okavango Delta of Botswana was assessed. Microbial ... -
The first 60-O-sulfated phenylanthraquinones: isolation from Bulbine frutescens, structural elucidation, enantiomeric purity, and partial synthesis
(Elsevier Ltd.http://www.elsevier.com/wps/find/journaldescription.cws_home/942/description#description, 2005)From the roots of Bulbine frutescens, the first sulfated phenylanthraquinones were isolated, together with their known sulfate-free analogs. Their structures were elucidated by spectroscopic and chiroptical methods, by ...