Chemistry: Recent submissions
Now showing items 1-20 of 85
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GC-MS analysis and preliminary antimicrobial activity of albizia adianthifolia (Schumach) and pterocarpus angolensis (DC)
(MDPI, https://www.mdpi.com/, 2016-01-29)The non-polar components of two leguminoceae species Albizia adianthifolia (Schumach), and Pterocarpus angolensis (DC) were investigated. GC-MS analysis of the crude n-hexane and chloroform extracts together with several ... -
Antimicrobial Flavonoids from Bolusanthus speciosus
(Georg Thieme Verlag, https://www.thieme.com/, 2002)A new isoflavanone namely 3,5,7,2′,4′-pentahydroxy-8,3′-di(γ,γ-dimethylallyl)isoflavanone (bolusanthin II) and four new pterocarpans identified as 3-hydroxy-6′,6′-dimethylpyrano[2′,3′:1,2] [6aR,11aR]-8,9-methylenedioxypterocarpan ... -
Phenolic and antibacterial constituents of Vahlia capensis
(Georg Thieme Verlag, https://www.thieme.com/books-main/biochemistry/product/3494-planta-medica, 1997)The n-butanol fraction of Vahlia capensis yielded kaempferol, quercetin, afzelin, astragalin, quercitrin, iso-quercitrin, rutin, gallic acid, chiro-inositol, dulcitol, and a novel biflavonoid, VC-15B (vahlia biflavone). ... -
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 ... -
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 ... -
Antioxidant and antidiabetic potential of Myrothamnus flabellifolius found in Botswana
(Cogent OA, https://www.cogentoa.com/journal/biology, 2016-12-29)The total phenol content, antioxidant and antidiabetic activity of Myrothamnus flabellifolius (MF) were investigated. The study revealed 70% ethanol/water (EW70), 70% methanol/water (MW70) and methanol (Me) extracts to ... -
Antibiotic activity of selected Botswana Medicinal Plants
(The Botswana Society, http://journals.ub.bw/index.php/bnr/index, 1998)A number of plant extracts from selected Botswana Medicinal Plants were tested against a battery of organisms for antibiotic activity. The antibiotic profile for most of these extracts seems to support their traditional ... -
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 ... -
Antibacterial activity of crude extracts and pure compounds isolated from Vernonia galamensis leaves
(Academic Journals, https://academicjournals.org/journal/AJPP, 2018-03-22)The aim of this study was to test the antibacterial property of the extract of the leaves and isolated compounds of Vernonia galamensis that is traditionally claimed to have diverse medicinal use. The disk diffusion method ... -
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 ... -
Volumetric properties of (Difurylmethane + an Amide) binary mixtures at 293.15K, 298.15K and 303.15 K
(Science Publishing Group, http://www.ajphyschem.org/, 2017-04)Densities (ρ) of pure difuryl methane (DFM), N-methylformamide (NMF), N-ethylformamide (NEF), N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA) and those of [DFM + (NMF or NEF or DMF or DMA] binary mixtures over ... -
Analysis of volatile compounds in Khadi (an unrecorded alcohol beverage) from Botswana by Gas Chromatography-Flame Ionization Detection (GC-FID)
(Sabinet;https://journals.co.za/, 2014)Chemical analysis of volatile compounds from khadi, an unrecorded alcoholic beverage from Botswana, was carried out using gas chromatography-flame ionization detection (GC–FID). Ten samples of khadi from two different ... -
Sorption of heavy metals by Ferralic-Arenosol and Vertic-Luvisol: a comparative isothermal study
(Canadian Center of Science and Education, http://www.ccsenet.org, 2014-02-26)Modeling of sorption data is essential for characterizing retention of heavy metals by the soil matrices as well as to predict the fate of heavy metals in the environment. We carried out a study to evaluate adsorption ... -
Neutral polyfluoroalkyl substances in the global Atmosphere
(The Royal Society of Chemistry, http://pubs.rsc.org/en/journals/journalissues/em#!recentarticles&all, 2014)Concentrations of neutral per- and polyfluoroalkyl substances (nPFAS) in the atmosphere are of interest because nPFAS are highly mobile percursors for perfluoroalkyl acids. Two calibration studies in Ontario, Canada and ... -
A sensitive LC-MS/MS method employing a THF/water solvent system for the determination of chloramphenicol, thiamphenicol and florfenicol in bovine muscle
(Royal Society of Chemistry ,www.rsc.org/, 2014)A THF–water solvent system was used in the development of a method for the LC-MS/MS determination of chloramphenicol (CAP), thiamphenicol (TAP) and florfenicol (FFC) in bovine muscle. The tetrahydrofuran (THF)–water solvent ... -
Reactions of salicylaldehyde and enolates or their equivalents: versatile synthetic routes to chromane derivatives
(Beilstein-Institut, https://www.beilstein-journals.org/bjoc/home/home.htm, 2012)The reported methodologies for the synthesis of chromane derivatives through the reaction of salicylaldehyde and enolates are discussed. The enolates and their equivalents involved in the reactions discussed in this article ... -
Antioxidant and antibacterial constituents from Morus nigra
(Academic Journals, http://www.academicjournals.org/ajpp, 2011-06)The objective of this study was to isolate and characterize the constituents of the local Morus nigra L. (Black mulberry), to compare its constituents with other studied Mulberries and to evaluate its antioxidative and ... -
A study of the removal of heavy metals from aqueous solutions by Moringa oleifera seeds and amine-based ligand 1,4-bis[N,N-bis(2-picoyl)amino]butane
(Elsevier Science Ltd, www.elsevier.com/locate/aca, 2012)Uptake for lead, copper, cadmium, nickel and manganese from aqueous solution using the Moringa oleifera seeds biomass (MOSB) and amine-based ligand (ABL) was investigated. Experiments on two synthetic multi-solute systems ... -
Intermediate and ion-pair formation in the outer-sphere reactions between azido-pentacyanocobaltate(III) and iron(II) polypyridyl complexes in aqueous medium
(Springer Science+Business Media B.V., http://www.springer.com/chemistry/journal/11243, 2009)The kinetics of the reactions between azidopentacyanocobaltate(III), Co(CN)5N3 3-, and iron(II) polypyridyl complexes, Fe(LL)3 2? (LL = bipy, phen), have been studied in both neutral and acidic aqueous solutions at I ... -
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 ...