Table 2.
Polyphenolic composition of WPE, RPE, and CE [17].
| Polyphenolic Compounds |
WP (µg/g) | RP (µg/g) | C (µg/g) |
|---|---|---|---|
| Gallic acid | 128.19 ± 0.93 | 146.87 ± 1.13 | 39.57 ± 0.30 |
| Protocatechuic acid | 57.17 ± 0.24 | 34.88 ± 0.12 | 34.88 ± 0.12 |
| Caftaric acid | <0.02 | <0.02 | <0.02 |
| Gentisic acid | <0.02 | <0.02 | - |
| Catechin | 539.14 ± 1.86 | 561.93 ± 4.07 | 413.40 ± 3.65 |
| Vanillic acid | - | 45.00 ± 0.88 | - |
| Syringic acid | 4.38 ± 0.12 | 72.22 ± 0.62 | 1.69 ± 0.01 |
| Epicatechin | 513.52 ± 2.48 | 425.78 ± 4.22 | 278.90 ± 2.33 |
| p-Coumaric acid | - | <0.02 | - |
| Hyperoside | <0.02 | - | <0.02 |
| Isoquercitrin | 29.70 ± 0.30 | 6.59 ± 0.09 | 3.50 ± 0.05 |
| Rutin | 2.63 ± 0.07 | - | 2.63 ± 0.04 |
| Quercitrin | 26.08 ± 0.37 | - | - |
| Quercetin | 6.69 ± 0.02 | 9.99 ± 0.01 | - |
| Luteolin | 3.50 ± 0.04 | - | - |
Each value is the mean ± SD of three independent measurements. WP—white pomace, RP—red pomace, C—canes. Values are the mean ± SD (n = 3). Note: “-” means not found, below the detection limit.