1. SARChI Postharvest Technology Research Laboratory, Africa Institute for Postharvest Technology, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa
2. Department of Food Science, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa
3. South African Grape and Wine Research Institute (SAGWRI), Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa
4. Postharvest and Agroprocessing Research Centre, Department of Botany and Plant Biotechnology, Faculty of Science, University of Johannesburg, Johannesburg 2006, South Africa
5. UNESCO International Centre for Biotechnology, Enugu 410001, Nigeria