1. Phytomedicine and Phytopharmacology Research Group, Department of Plant Sciences, University of the Free State, Qwaqwa campus, Phuthaditjhaba 9866, South Africa
2. Department of Microbial, Biochemical and Food Biotechnology, University of the Free State, PO Box 339, Nelson Mandela Drive, 9301 Bloemfontein, South Africa
3. Phytomedicine, Food Factors and Toxicology Research Laboratory, Biochemistry Unit, Department of Biosciences and Biotechnology, Kwara State University, PMB 1530, Ilorin, Nigeria