1. Department of Industrial Chemistry Faculty of Physical Sciences University of Ilorin, P. M. B. 1515 Ilorin Nigeria
2. Department of Chemical Sciences Faculty of Science University of Johannesburg, Doornfontein Campus Corner Nind and Beit Streets, P. O. Box 17011 Johannesburg 2028 South Africa
3. Department of Chemistry Faculty of Natural and Agricultural Sciences University of Pretoria Private Bag X20, Hatfield 0028 Pretoria South Africa
4. Department of Biochemistry Faculty of Life Sciences University of Ilorin, P. M. B. 1515 Ilorin Nigeria
5. Department of Chemistry and Materials Science Faculty of Natural Science Novosibirsk State University, 1 Pirogova St. 630090 Novosibirsk
6. School of Chemical Sciences Universiti Sains Malaysia 11800 Penang Malaysia
7. Department of Pure and Industrial Chemistry Kogi State University (Prince Abubakar Audu University), P.M.B 1008 Anyigba Kogi State Nigeria