Table 3.
Average polyphenolic composition of the grape seeds according to the sampling time (after 2 days of maceration and at racking off). Effect of sampling time and interactions between sampling time and cultivar (2-factors ANOVA). mDP = mean degree of polymerization; G% = percentage of galloylation; EGC = (−)-epigallocatechin; C = (+)-catechin; EC = (−)-epicatechin; ECG = (−)-epicatechin-3-O-gallate.
| 2 Days | Racking off | F | Sig | Sig Fcv*time | ||
|---|---|---|---|---|---|---|
| Total flavonoids (mg/g DW) | 85.0 | 40.7 | 66 | *** 1 | *** | |
| Total polyphenols (GAE) (mg/g DW) | 44.2 | 26.3 | 454 | *** | *** | |
| mDP | 3.6 | 4.6 | 220 | *** | *** | |
| G% | 18.2 | 18.4 | 4 | ns | *** | |
| Condensed tannins (mg/g DW) | 22.0 | 14.2 | 292 | *** | *** | |
| Extention units (%) | EGC | 0.29 | 0.38 | 39 | *** | ns |
| C | 3.1 | 8.7 | 168 | *** | *** | |
| EC | 56.7 | 55.4 | 4.9 | ns | *** | |
| ECG | 12.3 | 13.3 | 41 | *** | ** | |
| Terminal units (%) | C | 11.3 | 9.3 | 65 | *** | ** |
| EC | 10.3 | 7.7 | 182 | *** | *** | |
| ECG | 5.9 | 5.1 | 1303 | *** | *** | |
| Flavan-3-ols (mg/g DW) | C | 1.00 | 0.34 | 162 | *** | ** |
| EC | 0.64 | 0.23 | 133 | *** | * | |
1 Significance: *, **, *** and ns represent significance at p ≤ 0.05, 0.01, 0.001 and not significant, respectively.