1. Applied Microbial and Health Biotechnology Institute, Cape Peninsula University of Technology, P.O. Box 1906, Bellville 7535, Cape Town, South Africa
2. Department of Agricultural Extension, Cape Peninsula University of Technology, P.O. Box 1906, Bellville 7535, Cape Town, South Africa
3. Medicinal Plant and Economic Development Research Centre, Department of Botany, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
4. Department of Biochemistry and Microbiology, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa