[1] Univ Mpumalanga, Sch Agr & Nat Sci, Corner R40 & D725 Rd, ZA-1200 Nelspruit, South Africa
[2] Agr Res Council Trop & Subtrop Crops, Agroproc & Postharvest Technol Div, ZA-1200 Nelspruit, South Africa
[3] Tshwane Univ Technol, Dept Biotechnol & Food Technol, Private Bag X680, ZA-0083 Pretoria, South Africa
[4] Univ Pretoria, Dept Consumer & Food Sci, Private Bag X20, ZA-0028 Hatfield, South Africa