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Chemistry Latest Research

Publications

S.S. Gololo, M.A. Mogale, L.J. Shai, N.M. Agyei and P. Masoko, “Effect of concoction extraction on the leaves of Barleria dinteri (Oberm), Grewia flava (DC) and Jatropha lagarinthoides (Sond) on inherent antioxidant and antibacterial activities” Research Journal of Medicinal Plants, CC: CC-CC, 2017.

S.S. Gololo, L.J. Shai, L.S. Sethoga, N. Agyei, K.E. Bassy and M.A. Mogale, “Isolation of a mixture of Phytosterol compounds from the n-hexane extract of Jatropha lagarinthoides (Sond) collected from Zebediela sub-region in Limpopo province, South Africa” 9, 3084-3087, 2106.

S.S. Gololo, L.J. Shai, N.M. Agyei and M.A. Mogale, “Effect of seasonal changes on the quantity of phytochemicals in the leaves of three medicinal plants from Limpopo province, South Africa” Journal of Pharmacognosy and Phytotherapy, 8, 168-172, 2016.

Adebayo M. Shofolahan, Nana M. Agyei and Jonathan O. Okonkwo, “Preparation, characterisation and application of H3PO4 activated maize tassel for remediation of eutrophic phosphorus” Fresenius Environmental Bulletin, 7, 2514-2518, 2016.

Mambo Moyo, Jonathan O Okonkwo and Nana M. Agyei, “Maize tassel modified carbon paste electrode for voltammetric determination of Cu (II)” Environmental Monitoring and Assessment, 186, 4807-4817, 2014.

Mambo Moyo, Jonathan O. Okonkwo and Nana M. Agyei, “An amperometric biosensor based on horseradish peroxidase immobilized onto maize tassel-multi-walled carbon nanotubes modified glassy carbon electrode for determination of heavy metal ions in aqueous solution” Enzyme and Microbial Technology, 56, 28-34, 2014.

Mambo Moyo, Jonathan O. Okonkwo and Nana M. Agyei, “Optimization of horseradish peroxidase immobilization on glassy carbon electrode based on maize tassel-multiwalled carbon nanotubes for sensitive copper (II) ion detection” International Journal of Electrochemical Science, 9, 1439-1453, 2014.

Mambo Moyo, Jonathan O. Okonkwo and Nana M. Agyei, “A novel hydrogen peroxide biosensor based on adsorption of horseradish peroxidase onto a nanobiomaterial composite modified glasy carbon electrode” Electroanalysis, 25, 1946-1954, 2013.

Mamabolo T, Nana M. Agyei, Beverly Summers, “Cosmetic and amino acid analysis of the effects of lye and no-lye relaxer treatment on adult black female South African hair” Journal of Cosmetic Science, 64, 4, 287-296, 2013.

MM Sekhula, JO Okonkwo, CM Zvinowanda, NM Agyei and AJ Chaudhary, “Fixed bed column adsorption of Cu (II) onto maize tassel-PVA beads” Journal of Chemical Engineering & Process Technology, 3:131, doi: 10.4172/2157-7048.1000131, 2012.

Mambo Moyo, Jonathan O Okonkwo and Nana M. Agyei, “Review: Recent advances in polymeric materials used as electron mediators and immobilizing matrices in developing enzyme electrodes” Sensors, 12, 923-953, 2012.

ER Sadiku, A Chacko, LMK Kekana, G Phiri, JO Okonkwo, CM Zvinowanda, MM Sekhula and NM Agyei, “Mechanical and rheological characteristics of micro-particle maize tassel-filled polypropylene micro-composites” Journal of Materials Science and Engineering B, 1, 131-147, 2011.

Per Ola Darnerud, Marie Aune, Lotta Larsson, Sanna Lignell, Tshinane Mutshatshi, Jonathan Okonkwo and Nana Agyei, “Levels of brominated flame retardants and other persistent organic pollutants in breast milk samples from Limpopo province, South Africa” Science of the Total Environment, 409, 4048-4053, 2011.

C.M. Zvinowanda, JO Okonkwo, N.M. Agyei, M van Staden, W Jordaan and V. Kharebe “Recovery of lead (II) from aqueous solutions by Zea mays tassel biosorption” American Journal of Biochemistry and Biotechnology 6(1), 1-10, 2010.

C.M. Zvinowanda, J.O. Okonkwo, P.N. Shabalala and N.M. Agyei, A novel adsorbent for heavy metal remediation in aqueous environments, International Journal of Environmental Science and Technology, 6, 425-434, (2009).

N.M. Agyei, “The mechanism of phosphate removal from aqueous solution by ordinary Portland cement and its blends with fly ash and slag” Fresenius Environmental Bulletin, 18, 1614-1617, (2009).

C.M. Zvinowanda, J.O. Okonkwo, M.M. Sekhula, N.M. Agyei and R. Sadiku, “Application of maize tassel for the removal of Pb, Se, Sr, U and V from borehole water contaminated with mine wastewater in the presence of alkaline metals” Journal of Hazardous Materials, 164, 884-891, (2009).

C.M. Zvinowanda, J.O. Okonkwo, N.M. Agyei and P.N. Shabalala, “Physicochemical characterisation of maize tassel adsorbent: Part I. Surface texture, microstructure and thermal stability” Journal of Applied Polymer Science, 111, 1923-1930, (2009).

C.M. Zvinowanda, J.O. Okonkwo, N.M. Agyei and P.N. Shabalala, “Preparation and characterisation of biosorbents made from tassel” Canadian Journal of Pure and Applied Sciences, 2, 483-488, (2008).

C.M. Zvinowanda, J.O. Okonkwo, V. Mpangela, J. Phaleng, P.N. Shabalala, T. Dennis, P. Forbes, N.M. Agyei and K.I. Ozoemena, “Biosorption of toxic metals: The potential use of maize tassel for the removal of Pb (II) from aqueous solutions” Fresenius Environmental Bulletin, 17, 814-818, (2008).

T.N. Mutshatshi, J.O. Okonkwo, B. Botha and N.M. Agyei, “Organochlorine residues in maternal milk from inhabitants of the Thohoyandou area, South Africa” Toxicological & Environmental Chemistry, 90, 695-706, (2008).

J.O. Okonkwo, T.N. Mutshatshi, B. Botha and N.M. Agyei, “DDT, DDE and DDD in Human Milk from South Africa” Bulletin of Environmental Contamination and Toxicology, 81, 348-354, (2008).

Magano S. R., Thembo K. M., Ndlovu S. M., Makhubela N. F. H. African Journal of Biotechnology, 2008, 7(4), 476-481

N.M. Agyei, C.A. Strydom and J.H. Potgieter, “Estimation of the capacity of South African coal fly ash for phosphate ion removal from aqueous solution” Proceedings of the 11th International Congress on the Chemistry of Cement, 2216-2225, ICC, Durban, 11-16 May 2003. ISBN Number: 0-9584085-8-0, (2003). Editors: G. Grieve and G. Owens.

N.M. Agyei, C.A. Strydom and J.H. Potgieter, “The removal of phosphate ions from aqueous solution by fly ash, slag, ordinary Portland cement and related blends” Cement and Concrete Research, 32, 1889-1897, (2002).

N.M. Agyei, C.A. Strydom and J.H. Potgieter, “An investigation into phosphate ion adsorption from aqueous solution by fly ash and slag” Cement and Concrete Research, 30, 823-826, (2000).

Mphahlele, M.J., Gheevargheese, O., Makhubela, N. F. H., Phosphorus, Sulfur and Silicon, and related compounds, 2000,166, 303

N.M. Agyei, “Estimation of chloroquine-heparin binding constants by capillary zone electrophoresis” South African Journal of Chemistry, 51(1), 60-62, (1998).

N.M. Agyei, “Capillary zone electrophoretic enantioseparation of racemic antihistamines by dextran sulphates” Analytica, 5(3), 14-17, (1997).

N.M. Agyei, K.H. Gahm and A.M. Stalcup, “Chiral separations using heparin and dextran sulphate in capillary zone electrophoresis” Analytica Chimica Acta, 307, 185-191, (1995).

A.M. Stalcup and N.M. Agyei, “Heparin: a chiral mobile phase additive for capillary zone electrophoresis” Analytical Chemistry, 66, 3054-3059, (1994).

Selected Publications

Mudumbi, J.B.N., Ntwampe, S.K.O., Muganza, M., Okonkwo, J.O. and Rand, A.M. 2012. Concentrations of Perfluorinated Compounds in Sediment of Western Cape Rivers, South Africa. Carpathian journal of earth and environmental sciences 9(3):147-158· August 2014

Mudumbi JBN, Ntwampe SKO, Muganza, M, Okonkwo JO, Rand AM.; c2012. Proceedings of the Joint International Conference on Science and Technology for Development in Africa; Cape Town, South Africa: Cape Peninsula University of Technology.

Mudumbi, J.B.N., Ntwampe, S.K.O., Muganza, M. and Okonkwo, J.O. 2012. Susceptibility of riparian wetland plants to perfluorooctanoic acid (PFOA) accumulation. International Journal of Phytoremediation, 2014, 16,926–936

Mudumbi, J.B.N., Ntwampe, S.K.O. Muganza, M. and Okonkwo, J.O. Perfluorooctanoate (PFOA) and Perfluorooctane sulfonate (PFOS) in South African river water Water Science & Technology. 2014, Vol. 69 Issue 1, p185-194. 10p

Muganza Munyololo, David W. Gammon, Ilka Mohrholz; Extending the scope of the Ferrier reaction: fragmentation-rearrangement reactions of selectively substituted 1,2-cyclopropanated glucose derivatives; Carbohydrate Research, 2012, 351, 49-55

David W. Gammon, Daniel J. Steenkamp, Vuyo Mavumengwana, Mohlopheni J.Marakalala,Theophilus T. Mudzunga, Roger Hunter, Muganza Munyololo, Conjugates of plumbagin and phenyl-2-amino-1-thioglucoside inhibit MshB, a deacetylase involved in the biosynthesis of mycothiol, Bioorg. Med.Chem., 2010, 18, 2501–2514

Kiremire, Enos M. R.; Chibale, Kelly; Rosenthal, Philip J.; Daniel, Likius S.; Negonga, Albertina M.; Muganza Munyololo, Metal complexes with high biological activity against chloroquine resistant strain of Plasmodium falciparum parasite. Biosciences, Biotechnology Research Asia (2007), 4(2), 399-402

M.A. Debeila, R.P.K Wells and .J. A. Anderson, Activity of Au-TiO2 and  Au-TiO2-In2O3 for CO oxidation in the absence and presence of water. Journal of Catalysis 239 (2006) 162-172

Mahlaba A. Debeila, Mpfuzeni C. Raphulu, Emma Mokoena, Miguel Avalos, Vitalii Petranovskii, Neil J. Coville and Mike S.Scurrell , The influence of gold on the optical properties of sol-gel derived titania. , Journal of Material Science and Engineering A, 396 (2005) 70

Mahlaba A. Debeila, Mpfuzeni C. Raphulu, Emma Mokoena, Miguel Avalos, Vitalii Petranovskii, Neil J. Coville and Mike S.Scurrell , The effect of gold on the phase transitions of titania., Journal of Material Science and Engineering A, 396 (2005) 61

M.A. Debeila, N.J.Coville, M.S.Scurrell and G.R. Hearne, DRIFTS studies of the interaction of nitric oxide and carbon monoxide on Au-TiO2’, Catal. Today 72 (2002) 79

M.A. Debeila,  H. Pollak,  N.J.Coville and T.R. Motjope, Magnetic Properties and Reduction Characteristics of Fe/Co/B, Hyperfine Interactions, 120/121, (1999) 757-761.

M.A. Debeila, G.R. Hearne, H. Pollak and N.J.Coville, Characterization of Au/Co/TiO2 catalytic particles. Hyperfine Interactions, 3 (1998) 73-76.

B.C. Satishkumar, A. Govindaraj, J. Mofokeng, G.N. Subbanna and C.N.R. Rao, J. Phys. B: At. Mol. Opt. Phys. 29 (1996), 4925.

Conferences:

Oral: a. Medunsa Accademic Day (1999). b. Frank Warren Organic Chemistry  Conference, Rhodes University, Grahamstown, South Africa (2003)- Synthesis and spectroscopic studies of 4-amino-2-arylquinolines and their derivatives.

Posters: a. The 7th Frank Warren Conference On Organic Chemistry, Warmbaths, South Africa (2000)- Regio- and stereoselective α-halogenation of  2-aryl-1,2,3,4-tetrahydro-1-methylsulfonyl-4-quinolones. b. The 7th IBN SINA International Conference on Pure and Applied Heterocyclic Chemistry, Alexandria, Egypt (2000)-Reactions of 2-aryl-1,2,3,4-tetrahydro-4-quonolones and their N-methylsulfonyl derivatives with iodine in methanol. c. Frank Warren Organic Chemistry  Conference, Rhodes  University, Grahamstown, South Africa (2003)- Synthesis and spectroscopic studies of 4-amino-2-arylquinolines and their derivatives.

Varian NMR Spectrometer Users’ Meeting –The Breakwater Lodge, University Of Cape Town, Cape Town, South Africa  (2001).

Varian NMR Spectrometer Users’ Meeting – University Of Stellenbosch, Stellenbosch, South Africa  (2002).