Now showing items 1-10 of 73
An investigation of new heterogeneous hydrotalcite-like catalysts for the cis-dihydroxylation of olefins.
The use of supported catalysts to essentially combine the positive traits offered by both homogeneous and heterogeneous catalysis has become a competitive field of research. In particular, hydrotalcite-like catalysts (HTIc) ...
Characterisation of SAPPI SAICCOR pulp mill's effluent.
SAPPI SAJCCOR, whose factory is situated south of Durban, South Africa, is one of the few paper and pulp mills that uses the acid sulphite process with calcium and magnesium bases to produce a high-grade cellulose pulp. ...
A phytochemical investigation of two South African plants with the screening of extractives for biological activity.
Two South African medicinal plants, Strophanthus speciosus and Eucomis montana, were investigated phytochemically. From Strophanthus speciosus a cardenolide, neritaloside, was isolated, whilst Eucomis montana yielded ...
The chemical investigation of Ledebouria zebrina and Scilla natalensis.
Ledebouria zebrina and Scilla natalensis Planch were the two species investigated in this work. Ledebouria zebrina belongs to the Hyacinthaceae (Liliacea sensu lato) and to this date, the chemical composition of this ...
Studies towards the synthesis of frog alkaloid 251F.
No abstract available
A comparative study of molybdenum and iron phosphate-based catalysts in n-hexane activation.
A comparative study of the activation of n-hexane over the 12-molybdophopshoric acid (H3PMo12O40 or HPA), its Fe3+ doped salt (Fe0.69H0.93PMo12O40 or Fe doped HPA) and the iron phosphate catalyst (P/Fe = 1.22) was carried ...
Extractives from eucomis montana and agapanthus inapertus.
Two species belonging to different families were investigated, Eucomis montana from the Hyacinthaceae and Agapanthus inapertus from the Agapanthaceae. To date no previous chemical investigation on Eucomis montana has ...
An investigation of the photostabilisation of sunscreen absorbers by plant polyphenols.
Commercial sunscreen products are used to protect the skin against hannful ultraviolet (UV) radiation that can induce skin cancer at high dosage. These products contain UV filters that can reflect, scatter or absorb UV ...
DNA cleavage, photoinduced by benzophenone-based sunscreens.
The topical application of sunscreens is widely practised to protect healthy and photosensitive skins from the sun. The benzophenone-derived sunscreens, e.g. 2-hydroxy-4-methoxy benzophenone-5-sulphonic acid (or benzophenone-4) ...
Extractives from marine organisms.
The study involves the investigation of the chemical composition of some marine organisms. This entails collecting the organism, extracting compounds from it and separation, characterization and identification of these ...