1. Department of Biochemistry, Stellenbosch University, Private Bag X1,
Matieland, 7602 Stellenbosch, South Africa
2. Department of Chemistry and Polymer Science, Stellenbosch University, Private Bag X1, Matieland, 7602 Stellenbosch, South Africa
3. Department of Horticultural Science, Stellenbosch University, Private Bag X1,
Matieland, 7602 Stellenbosch, South Africa
4. School of Agriculture and Food Science, University of Queensland, St. Lucia 4072, Australia
5. Central Analytical Facility, Stellenbosch University, Private Bag X1,
Matieland, 7602 Stellenbosch, South Africa