1. Botswana International University of Science and Technology, Department of Chemistry and Forensic Sciences, Private Bag 16, Palapye, Botswana
2. Botho University, Department of Applied Sciences, PO Box, Gaborone 501564, Botswana
3. University of Botswana, Faculty of Science, Private Bag, Gaborone 0704, Botswana
4. Botswana International University of Science and Technology, Department of Biological Sciences and Biotechnology, Private Bag 16, Palapye, Botswana