1. Department of Applied Chemistry, Adama Science and Technology University, P.O.Box 1888, Adama 251, Ethiopia
2. Department of Chemistry, Wachemo University, P.O.Box 667, Hossana 667, Ethiopia
3. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 10607 Taipei, Taiwan
4. Department of Chemistry, Debre Markos University, P.O. Box 269, Debre Markos 269, Ethiopia
5. School of Allied Health Professions, University of Botswana, P/bag UB, 0022 Gaborone, Botswana
6. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050 Johannesburg, South Africa
7. Department of Chemistry, University of Botswana, P/bag UB, 0022 Gaborone, Botswana