1. Department of Food Science and Technology, School of Agriculture, University of Venda, Thohoyandou 0950, South Africa
2. Postharvest-Handling Group, ISEKI-Food Association, Vienna, Austria
3. Univen Centre for Continuing Education, University of Venda, Thohoyandou 0950, South Africa
4. Department of Agricultural Engineering, School of Agriculture, University of Venda, Thohoyandou 0950, South Africa
5. Department of Food Science and Technology, Cape Peninsula University of Technology, Bellville 7535, South Africa