TITLE: THE CHEMICAL, MINERALOGICAL, STRUCTURAL AND SURFACE PROPERTIES OF SELECTED UGANDAN CLAYS AND THEIR APPLICATION IN BLEACHING SELECTED VEGETABLE OILS.
Clays occur in almost all parts of Uganda and have been used in many ways including making bricks and pots, preserving herbal medicine, treating ulcers; but have not been used to bleach oils. Clays used to clarify oils in industries are imported. This study bleached cotton-seed and sunflower-seed oils to grades fit for human consumption using clays from Budadiri, Chelel, Chodah, Lwanda, Kajansi, Kawuku, Mutufu, Nakawa, Ngero, Umatengah among others in a pilot project. The data produced shows local clays from Uganda can substitute imported ones. The local clays strongly adsorbed free-fatty acids, carotenoids, tocopherols, xanthophylls, phytosterols and squalenes, phosphatides, partial glycerides, peroxides and trace elements such as copper and iron giving way for linear isotherms. Formulae and structures of clays from Uganda have been proposed.
Date: Thursday, 12th January, 2017
Venue: Botany-Zoology Lecture Theatre
Candidate: I.Z. MUKASA-TEBANDEKE
Assoc. Prof. S.A. Nyanzi, Department of Chemistry, Makerere University.
Assoc. Prof. G.W. Nyakairu, Department of Chemistry, Makerere University.
Prof. P .J.M. Ssebuwufu, c/o Department of Chemistry, Makerere University.
Mukasa-Tebandeke, I.Z., Ssebuwufu, P.J.M., Nyanzi, S.A., Schumann, A., Nyakairu, G.W.A., Ntale, M. and F. Lugolobi, (2015). The Elemental, Mineralogical, IR, DTA and XRD Analyses Characterized Clays and Clay Minerals of Central and Eastern Uganda. Advances in Materials Physics and Chemistry, 5, 67-86.
Mukasa-Tebandeke, I.Z., Ssebuwufu, P.J.M., Nyanzi, S.A., Nyakairu, G.W., Ntale, M., Lugolobi, F. and A. Sschumann, (2015). Adsorption
Behavior of Acid-Leached Clays in Bleaching of Oil. American Journal
of Analytical Chemistry, 6, 495-512.
Mukasa-Tebandeke, I.Z., Ssebuwufu, P.J.M., Nyanzi, S.A., Schumann, A., Ntale, M., Nyakairu, G.W. and F. Lugolobi, (2015). Distinguishing Kaolinites and Smectite Clays from Central and Eastern Uganda Using Acidity, pH, Colour and Composition. American Journal of Analytical Chemistry, 6, 58-70.
Mukasa-Tebandeke, I.Z.; Ssebuwufu, P.J.M.;Nyakairu,G, W.A.; Nyanzi, S.A.; Ntale, M.; Schumann, A.; and F. Lugolobi, (2014). Recycling clays used in bleaching vegetable oils. Bulletin of Pure and Applied Sciences.Chemistry, 33C ; 27-42.
Mukasa-Tebandeke, I.Z.; Ssebuwufu, P.J.M.; Nyanzi, S.A.; Schumann, A , Nyakairu, G.W. and F. Lugolobi, (2014). Using trace metals, peroxide, acid and iodine values to characterize bleached using clays from Central oils and Eastern Uganda. Bulletin of Pure and Applied Science Geology,33F (.1-2) 9-23.
Mukasa- Tebandeke, I.Z., Ssebuwufu, P.J.M., Lugolobi, F., Nyanzi, S., Schumann, A. and H. Ssekaalo, (2006). The Bleaching vegetable oils using acid and alkali-leached clays. International Journal of Environmental Issues 2, 88-93.
Mukasa-Tebandeke, I.Z., Ssebuwufu, P.J.M., Lugolobi, F., Nyanzi, S., Schumann, A. and N. Kirsch, (2003). The Bleaching Clays of Central and Eastern Uganda: The Relation between Mineralogy and Chemical Composition to Bleaching Properties. International Journal of Environmental Issues, 1, 20-29.