Table 4.
Interactions means ± SE for the effects of year, production region and grape type on the total sugar content and antioxidant activity (TEAC) and TAC in table grapes.
| Parameter | Factor 3 | |||
|---|---|---|---|---|
| Factor 1 | Factor 2 | Grape Type | ||
| Year | Production Region | White | Red | |
| Sugar content (juice) Brix° |
2015 | South Africa | 17.2 ± 0.2 b A | 18.8 ± 0.2 a A |
| Mediterranean | 17.5 ± 0.3 a A | 17.9 ± 0.2 a B | ||
| 2016 | South Africa | 17.6 ± 0.3 b A | 18.7 ± 0.4 a AB | |
| Mediterranean | 17.1 ± 0.4 b A | 19.3 ± 0.4 a A | ||
| Antioxidant activity (DPPH) (µmol TE g−1) | 2015 | South Africa | 56.7 ± 0.8 b B | 91.4 ± 2.6 a B |
| Mediterranean | 63.5 ± 2.2 b A | 110.0 ± 4.3 a A | ||
| 2016 | South Africa | 51.6 ± 2.2 b B | 98.7 ± 2.3 a B | |
| Mediterranean | 60.1 ± 3.5 b A B | 140.0 ± 1.2 a A | ||
| Antioxidant activity (TEAC) (µmol TE g−1) | 2015 | South Africa | 5.9 ± 0.4 a B | 6.4 ± 0.5 a B |
| Mediterranean | 10.1 ± 0.8 a A | 9.4 ± 0.7 a A | ||
| 2016 | South Africa | 8.8 ± 1.3 a A | 3.8 ± 0.3 b C | |
| Mediterranean | 2.8 ± 0.2 b C | 5.8 ± 0.3 a B C | ||
TE, Trolox equivalent; cyan, 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 capital letters within the same column are not significantly different (General Linear Hypothesis test p < 0.05).