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Browsing Department of Chemistry by Type "Dissertation"

Now showing items 1-20 of 46

2-Aryl-6,8-Dibromo-4-Chloroquinazoline as scaffold for the synthesis of Novel 2,6,8-Triaryl-4-(Phenylethynyl)Quinazolines with potential photophysical properties

Paumo, Hugues Kamdem (2014-06)

The 2-aryl-6,8-dibromoquinazolin-4(3H)-ones were prepared in a single-pot operation by condensing 6,8-dibromoanthranilamide and aryl aldehydes in the presence of molecular iodine in ethanol. Treatment of the 2-aryl-6,8-d ...
Ab initio molecular orbital theoretical studies of the molecular complexes of boron trifluoride and oxygen electron donor ligands

Modau, Eric (2021-10)

The optimized geometrical structures, the interaction energies, the basis set superposition errors (BSSEs) and the infrared spectra of the monomers, homodimers and the molecular complexes formed between BF3 and a number of ...
The application of experimental design to investigate the solvent matrix effects observed during the Determination of Rhodium (Rh) in organic media by Graphite Furnace Atomic Absorption Spectrometry (GFAAS)

Baratta, Antonio (2010-11)

In an industrial application a GFAAS method for monitoring the Rh concentration in process streams is being used. Matrix effects are known to exist with the application of this technique; in fact, it was observed that ...
Biscarbene complexes of Bithiophene

Ramontja, James (2009-08)

Binuclear mixed biscarbene complexes of bithiophene were synthesized via the classical Fischer method of synthesis. The metal carbonyls, Mo(CO)6, Cr(CO)6, W(CO)6 and Mn(MeCp)(CO)3 were reacted with dilithiated bithiophene ...
Co-crystal engineering of phthalic acid derivatives with nitrogen-containing heterocyclic active pharmaceutical ingredients

Bourletidis, Jeraldine Michaela Maire (2024-02-28)

Fifteen heterocyclic active pharmaceutical ingredients were co-crystallized with phthalic acid derivatives, resulting in three series of co-crystals. Niacinamide, modified isoniazid (isoniazid modified with benzaldehyde), ...
The cytotoxic effect and molecular targets of ezetimibe in A549 lung cancer cells

Munnik, Chamone (2023)

The p53 gene is a well-known tumour suppressor gene, shown to be dysfunctional in more than 50% of human malignancies. The cellular significance of this oncogene is evident in a series of diverse cellular antiproliferation ...
The determination of pharmaceutical and personal care products in water and wastewater by gas chromatography-mass spectrometry

Nety, Sol Sauna (2017-09)

Emerging contaminants (EC) are unregulated substances that have entered the environment for as long as they have been produced through human activities. Within the ECs family, pharmaceuticals and personal-care products ...
Determination of quinolones in bovine kidney using hollow-fiber supported liquid membrane extraction prior to liquid chromatography tandem mass spectrometry

Gaolape, Kefilwe Precious (2017-10)

Focus of this study was on the development of one of the faster, simpler, cost effective and environmentally friendly sample pre-treatment techniques which employs a supported liquid membrane, in this case a Hollow-fiber ...
Development and application of dispersive liquid-liquid microextraction for the determination of tetracyclines in meat by liquid chromatography tandem mass spectrometry

Mookantsa, Sandy Oshi Squizer (2016-02)

An environmentally friendly, rapid and cost effective analytical procedure based on dispersive liquid-liquid microextraction was developed for the determination of six tetracyclines (TCs) in meat destined for human ...
The development of FT-Raman techniques to quantify the hydrolysis of Cobalt (III) nitrophenylphosphate complexes using multivariate data analysis

Tshabalala, Oupa Samuel (2007-03)

The FT-Raman techniques were developed to quantify reactions that follow on mixing aqueous solutions of bis-(1,3-diaminopropane)diaquacobalt( III) ion ([Co(tn)2(0H)(H20)]2+) and p-nitrophenylphosphate (PNPP). For the ...
Development of greener ultrasound and microwave-based sample preparation methods for spectroscopic determination of heavy metals in pet food samples

Ncube, Nomatter (2024-02-27)

Contamination of pet food with heavy metals is a crucial problem worldwide and it results in adverse health effects on pets, massive recall of the product, damaging of the brand name and financial loss. Therefore, researchers ...
Development of nafion/ palladium nanofiller as nanocomposite membrane for fuel cell applications

Mothibi, Mokone Constance Selina (2024-01)

The nanocomposite membranes were fabricated by incorporating palladium nanoparticles into Nafion® matrix to develop suitable membrane to be used as polymer electrolyte membrane (PEM) in Direct Methanol Fuel Cell (DMFC). ...
Development of novel mesoporous magnetic adsorbents from industrial waste and their application for removal of lead and efavirenz in aqueous solutions

Kgoedi, Thabang (2024-02)

Industrial waste materials have garnered increased attention as viable adsorbents that could be used for the extraction of heavy metals and organic pollutants from wastewater. This is primarily due to their abundant ...
Dispersive liquid-liquid micro-extraction of Chloramphenicol and its congeners residues in water, meat and milk followed by electron spray ionisation liquid chromaotgraphy tandem mass spectrometry detection

Kemokgatla, Ompelege E. (2017-10)

The use of veterinary drugs continues to be a challenge since some farmers use drugs for medicinal purposes, while others use them as growth promoters without observing the set withdrawal times. In emerging economies, ...
Dispersive liquid-liquid micro-extraction of steroidal hormones and determination in wastewater using high pressure liquid chromatography: charged aerosol detector

Osunmakinde, Cecilia Oluseyi (2014-10)

Steroid hormones belong to a group of compounds known as endocrine disruptors. They are hydrophobic compounds and are categorized as natural and synthetic estrogens. Some common household products have been implicated as ...
The effects of hydrating agents on the hydration of industrial magnesium oxide

Matabola, Kgabo Phillemon (2006-11-30)

Magnesium hydroxide, a stable flame retardant, can be obtained by mining or by the hydration of magnesium oxide. In this study, the effect of different hydrating agents on the pH of the hydrating solution, rate of hydration ...
Engineering polymers based on 1,1-diphenylethylene derivatives: polymer substrates as precursors for membrane development

Kasiama, Mizolo Ginette (2012)

A series of new, well-defined poly(ether ether sulfone), poly(ether ether ketone) and polyimide derivatives containing the diphenylethylene moiety were prepared by step-growth polymerization methods. Poly(ether ether ...
Evaluation and optimization of a stand-alone solar driven membrane filtration system for surface water treatment

Kajau, Tatenda Alfred (2022-02)

South Africa is classified as a water-stressed country and is faced with widespread water scarcity. Water scarcity is worse in rural areas of the country where a third of the population still reside. This is due to low ...
Evaluation of microextraction methods followed by inductively coupled plasma optical-emission spectroscopy for the quantitave determination of mercury from selective fossil fuels and their derivatives

Kiwanuka, Mxolisi Junior (2024-02-29)

Microextraction sample preparation methods are miniaturized formats which contributes to green approaches in Analytical Chemistry. They are mainly characterized by the minimum use of organic solvents. The aim of this ...
The evaluation of the Augmented Programme for ND Analytical Chemistry at the ML Sultan Technikon for the period 1994-1999

Timm, Delysia Norelle (2005-01)

Due to the inadequate schooling system and the underpreparedness of learners in South African High Schools, Higher Education Institutions are faced with learners who do not meet the minimum criteria for acceptance into ...

Browsing Department of Chemistry by Type "Dissertation"

Browsing Department of Chemistry by Type "Dissertation"

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