1. Postharvest Technology Research Laboratory, Department of Horticultural Science, Faculty of AgriSciences; Stellenbosch University; Private Bag X1, Matieland 7602 Stellenbosch South Africa
2. Perishable Products Export Control Board; 45 Silwerboom Avenue, Plattekloof Parow 7500 South Africa
3. Department of Mechanical and Mechatronics Engineering, Faculty of Engineering; Stellenbosch University; Private Bag X1, Matieland 7602 Stellenbosch South Africa