1. School of Applied Natural Science, Department of Applied Chemistry, Adama Science and Technology University, Adama 1888, Ethiopia
2. Department of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
3. School of Allied Health Professions, University of Botswana, Gaborone P/Bag UB 0022, Botswana
4. Department of Biology, College of Natural and Computational Science, Wollega University, P.O. Box: 395, Nekemte 251, Ethiopia
5. Botswana Institute for Technology Research and Innovation, Maranyane House, Plot No. 50654, Machel Drive, Gaborone Private Bag 0082, Botswana
6. Department of Chemical Engineering, University of South Africa, P/Bag X6, Florida, Johannesburg 1710, South Africa