1. Department of Chemistry, University of the Western Cape, Bellville, South Africa
2. Department of Biochemistry, McPherson University, Seriki Sotayo, Nigeria
3. Department of Science and Technology (DST)/Mintek Nanotechnology Innovation Centre (NIC), Department of Biotechnology, University of the Western Cape, Bellville, South Africa
4. Department of Chemistry and Polymer Science, Stellenbosch University, Stellenbosch, South Africa
5. Department of Chemistry, Cape Peninsula University of Technology, Bellville, South Africa