1. Department of Plant and Soil Sciences, University of Pretoria, Pretoria 0002, South Africa
2. Research Fellow, South African International Maritime Institute (SAIMI), Nelson Mandela University, Gqeberha 6019, South Africa
3. Chemicals Cluster, Centre for Nanostructures and Advanced Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa
4. School of Natural Resources, University of Missouri, Columbia, MO 65211, USA
5. College of Pharmacy, JSS Academy of Higher Education and Research, Mysuru 643001, India
6. Senior Research Fellow, Bio-Tech R&D Institute, University of the West Indies, Kingston IAU-016615, Jamaica