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Research Articles (Chemistry and Polymer Science)
Recent Submissions
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The impact of plasticizer and degree of hydrolysis on free volume of poly(vinyl alcohol) films
(MDPI, 2018-05)ENGLISH ABSTRACT: The effect of plasticizer species and the degree of hydrolysis (DH) on the free volume properties of poly(vinyl alcohol) (PVA) were studied using positron annihilation lifetime spectroscopy. Both glycerol ...
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Solid state NMR characterization and adsorption properties of lignocellulose-clinoptilolite composites prepared with siloxanes coupling agents
(South African Chemical Institute, 2015-02-15)ENGLISH ABSTRACT: This study reports the preparation of lignocellulose-clinoptilolite composites by means of N-terminated siloxanes as coupling agents, after acid hydrolysis. Reactions were carried out in the presence of ...
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The cytotoxicity of the ajoene analogue BisPMB in WHCO1 oesophageal cancer cells is mediated by CHOP/GADD153
(MDPI, 2017-05-28)ENGLISH ABSTRACT: Garlic is a food and medicinal plant that has been used in folk medicine since ancient times for its beneficial health effects, which include protection against cancer. Crushed garlic cloves contain an ...
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Lack of co-crystal formation with cyclotriphosphazenes : a cautionary tale
(South African Chemical Institute, 2016)ENGLISH ABSTRACT: The attempted formation of co-crystals with a series of cyclotriphosphazene derivatives has been investigated. Despite numerous attempts, only one co-crystal was obtained. The crystal structure of this ...
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Alkaloids with activity against the Zika virus vector Aedes aegypti (L.) - crinsarnine and sarniensinol, two new crinine and mesembrine type alkaloids isolated from the South African Plant Nerine sarniensis
(MDPI, 2016-10-27)Two new Amaryllidaceae alkaloids, belonging to the mesembrine- and crinine-types, named crinsarnine (1) and sarniensinol (2), were isolated from the dried bulbs of Nerine sarniensis together with bowdensine (3), sarniensine ...
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AuII : skaars of afgeskeep? 'n Kritiese literatuuroorsig
(LitNet, 2016-06-17)AFRIKAANSE OPSOMMING: Verbindings van AuII is reeds langer as 60 jaar bekend. ’n Literatuurstudie toon dat slegs ’n beperkte aantal struktuur- en bindingstipes tot dusver in suiwer vorm geïsoleer en gekarakteriseer kon ...
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The removal of copper and iron from wine using a chelating resin
(South African Society for Enology and Viticulture, 1986)An insoluble polymer-supported absorbant, developed for the selective removal of excess copper and iron from wine was tested. Tests conducted on dry white wine with excessive copper and iron showed effective removal of 98% ...
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Survey of ochratoxin A in South African wines
(South African Society for Enology and Viticulture, 2002)The mycotoxin, ochratoxin A (OTA), an important nephrotoxin, teratogen and carcinogen, is mainly produced as a secondary metabolite of Aspergillus and Penicillium species. The mycotoxin is a common contaminant of various ...
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Micromechanics of ultra-toughened electrospun PMMA/PEO fibres as revealed by in-situ tensile testing in an electron microscope
(Nature Publishing Group, 2014-09-11)A missing cornerstone in the development of tough micro/nano fibre systems is an understanding of the fibre failure mechanisms, which stems from the limitation in observing the fracture of objects with dimensions one ...
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Cation–π induced aggregation of water-soluble [PtII(diimine)(Ln-S,O)]+ complexes studied by ¹H DOSY NMR and TEM : from ‘dimer aggregates’ in acetonitrile to nano-aggregates (‘metallogels’) in water
(Royal Society of Chemistry, 2013)See PDF file for an abstract.
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Mechanism of tetrachloroplatinate(II) oxidation by hydrogen peroxide in hydrochloric acid solution
(Royal Society of Chemistry, 2014)See PDF file for an abstract.
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Synthesis of novel piperazine-linked anthranilic acids as potential small molecule kinase inhibitors
(South African Chemical Institute, 2014-03)Substituted anthranilic acid and piperazines were used as building blocks to prepare two libraries of compounds, with the aim being that they would exhibit biochemical activity as small molecule kinase inhibitors. The ...
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Antibacterial properties of tough and strong electrospun PMMA/PEO fiber mats filled with lanasol : a naturally occurring brominated substance
(MDPI, 2014-09-09)A new type of antimicrobial, biocompatible and toughness enhanced ultra-thin fiber mats for biomedical applications is presented. The tough and porous fiber mats were obtained by electrospinning solution-blended poly (methyl ...
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Inherently chiral calix[4]arenes via oxazoline directed ortholithiation : synthesis and probe of chiral space
(Beilstein-Institut, 2014-11-25)The diastereoselective oxazoline-directed lithiation of calix[4]arenes is reported with diastereoselective ratios of greater than 100:1 in some instances. Notably, it has been found that the opposite diastereomer can be ...
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Gold acyl complex formation and decarbonylation during indene synthesis from catalytically active vinylidene complexes
(Wiley, 2015-04)The development of targeted gold acyl complexes, which are generated from dialkynes via vinylidene intermediates, and can decarbonylate to form indenes by proto-aurolysis is highlighted.
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Quantitative survey of 3-alkyl-2-methoxypyrazines and first confirmation of 3-ethyl-2-methoxypyrazine in South African Sauvignon blanc wines
(South African Society for Enology and Viticulture, 2013)3-Alkyl-2-methoxypyrazines are important aroma components in Sauvignon blanc wine, contributing to the typical vegetative character associated with the cultivar. The analysis of methoxypyrazines is highly challenging ...
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1-tert-Butyl 2-ethyl 5-bromo-3-(thiophen-2-ylcarbonyl)-1H-indole-1,2-dicarboxylate
(International Union of Crystallography, 2013-01-16)ENGLISH ABSTRACT: In the title compound, C21H20BrNO5S, the thiophene group is located above the mean plane of the indole ring and displays rotational disorder (i.e. rotation through 180). The site occupancy of the major ...
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Temporal changes in the neonatal recognition cue of Dohne Merino Lambs (Ovis aries)
(Oxford University Press (OUP), 2014-02)The strong bond that is formed between ewe and lamb after parturition is important for lamb survival. Evidence exists that the ewe mainly employs olfactory recognition cues to distinguish her lamb from other lambs in the ...
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Butenolides from plant-derived smoke : natural plant-growth regulators with antagonistic actions on seed germination
(American Chemical Society and American Society of Pharmacognosy, 2010-01)Smoke plays an intriguing role in promoting the germination of seeds of many species following a fire. Recently, a bicyclic compound containing a condensed butenolide moiety, 3-methyl-2H-furo[2,3-c]pyran-2-one (1), was ...
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Thermal modulator array for analyte modulation and comprehensive two-dimensional gas chromatography
(Wiley-VCH Verlag, 2003-01)Segmented thermal modulators were fabricated for the modulation of column effluent in one-dimensional gas chromatography, comprehensive two-dimensional gas chromatography, and as sample introduction devices in other ...
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Mammalian exocrine secretions XVI : constituents of secretion of supplementary sacculi of dwarf hamster, Phodopus sungorus sungorus
(Springer Verlag, 2001-06)As a first step in a study of the role of the secretion of the supplementary sacculi (buccal secretion) of the dwarf hamster, Phodopus sungorus sungorus, almost complete chemical characterization of the secretion was ...
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Mammalian pheromone studies - III : (E,E)-7,11,15-trimethyl-3methylenehexa-deca-1,6,10,14-tetraene, a new diterpene analogue of ß-farnesene from the dorsal gland of the springbok, Antidorcas marsupialis
(Elsevier, 1978)The secretions produced by the cutaneous glands of mammals are generally considered to be involved in conspecific chemical communication, acting as pheromones. From a review of mammalian chemical ecology it appears that, ...
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Headspace analysis : a novel method for the production of capillary traps with ultra-thick stationary phase layers
(John Wiley & Sons, 1990-11)The development by Grab and Habaich of a headspace analytical technique which organic volatiles are trapped in short capillary traps coated with a layer of fine activated charcoal particles (COTs) or a layer of a suitable ...
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Avian exocrine secretions. I : chemical characterization of the volatile action of the uropygial secretion of the green woodhoopoe, Phoeniculus purpureus
(Springer Verlag, 2004-08)Using gas chromatography–mass spectrometry in conjunction with auxiliary techniques such as solid phase microextraction and determination of double bond positions by means of dimethyl disulfide derivatization, 45 ...
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Semiochemicals of the Scarabaeinae, III : identification of the attractant for the dung beetle Pachylomerus femoralis in the fruit of the Spineless monkey orange tree, Strychnos madagascariensis
(Dieterich'sche Verlagsbuchhandlung, Wiesbaden (now Mainz), 1991-04)Following the observation that the non-ball-rolling dung beetle Pachylomerus femoralis (Kirby) rolled the flesh-covered seeds from the fruit of the spineless monkey orange tree, Strychnos madagascariensis Poiret, an ...
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Pheromones of the Scarabaeinae, II : composition of the pheromone disseminating carrier material secreted by male dung beetles of the genus Kheper
(Dieterich'sche Verlagsbuchhandlung, Wiesbaden (now Mainz), 1990-01)Gel electrophoresis of the white flocculent pheromone disseminating secretions produced by males of the three dung beetle species, Kheper lumarcki, K. nigroacneus and K. subaeneus, revealed that three different proteins ...
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Asikliese karbeenkomplekse maak eerste opslae in goudstormloop
(LitNet Academic, 2012-12)OPSOMMING: Die eerste karbeenkomplekse van goud is reeds in 1971 deur Bonati en Minghetti gerapporteer. Verdere ontwikkelings na die 1980’s was stadig. Sedert 2007, toe die belangstelling in goudchemie reeds geweldig ...
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Acrolein dimer as a marker for direct detection of acrolein in wine
(South African Society for Enology and Viticulture, 2012)Acrolein is highly toxic and its presence in wine has been correlated with the development of bitterness. Analytical detection and quantification in aqueous solutions are challenging due to high reactivity and problems ...
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Semiochemicals of the Scarabaeinae VII : identification and synthesis of EAD-active constituents of abdominal sex attracting secretion of the male dung beetle Kheper subaeneus
(Springer Verlag, 2002-12)Using gas chromatography with flame ionization detection (FID) and electroantennographic detection (EAD) in parallel, butanoic acid, skatole, and (E)-2,6-dimethyl-6-octen-2-ol were identified as constituents of the abdominal ...
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The defouling of membranes using polymer beads containing magnetic micro particles
(Water Research Commission (WRC), 2010-10)Polymer membranes provide a good method of obtaining potable water but, as membranes always foul during water purification, the flux drops with time. Methods of physical cleaning of the polymer membranes, which do not ...
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