1. Department of Metallurgy, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, PO Box 17011, Doornfontein Campus, Johannesburg, Gauteng, South Africa
2. Department of Food Technology, Moshood Abiola Polytechnic, PMB 2210, Abeokuta, Ogun State, Nigeria
3. Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, PO Box 17011, Doornfontein Campus, Johannesburg, Gauteng, South Africa