Table 9.
Interactions means ± SE for the effects of the production system, production region and grape type on TEAC and TAC in table grapes.
| Parameter | Factor 3 | |||
|---|---|---|---|---|
| Factor 1 | Factor 2 | Grape Type | ||
| Production Region | Production System |
White | Red | |
| Sugar content (pulp) Brix° |
South Africa | Organic | 17.0 ± 0.2 b A B | 19.0 ± 0.2 a A |
| Conventional | 17.7 ± 0.2 b A | 18.7 ± 0.2 a A | ||
| Mediterranean | Organic | 17.3 ± 0.4 a A | 18.0 ± 0.3 a B | |
| Conventional | 16.6 ± 0.3 b B | 17.8 ± 0.3 a B | ||
| Sugar content (juice) Brix° |
South Africa | Organic | 17.1 ± 0.2 b AB | 18.9 ± 0.2 a A |
| Conventional | 17.6 ± 0.2 b AB | 18.6 ± 0.2 a A | ||
| Mediterranean | Organic | 17.8 ± 0.4 a A | 18.3 ± 0.3 a A | |
| Conventional | 16.9 ± 0.3 b B | 18.2 ± 0.3 a A | ||
| Antioxidant activity (TEAC) (µmol TE g−1) | South Africa | Organic | 7.0 ± 0.7 a AB | 6.8 ± 0.7 a AB |
| Conventional | 6.2 ± 0.6 a B | 4.8 ± 0.5 a B | ||
| Mediterranean | Organic | 8.6 ± 1.0 a A | 8.5 ± 0.8 a A | |
| Conventional | 5.6 ± 0.5 b B | 8.7 ± 0.9 a A | ||
TE, Trolox equivalent; cya, cyanidin 3-glucoside equivalents; mal, malvidin 3-glucoside equivalents; For each parameter assessed means labeled with the same lower case letter within the same row and same capital letters within the same column are not significantly different (General Linear Hypothesis test p < 0.05).