Table 4.
Generic polyphenol variables and individual polyphenol contents analyzed by HPLC-DAD of conventional whole Grenache grapes (CG), red organic whole red Grenache grapes (OG), and whole red Peruvian Red Globe grapes (PG).
| CG | OG | PG | |
|---|---|---|---|
| TPC 1 | 23.98 ± 2.60 | 26.37 ± 3.60 | 17.18 ± 1.87 * |
| TAC 1 | 0.98 ± 0.11 | 1.31 ± 0.08* | 0.71 ± 0.05 * |
| TFC 1 | 4.42 ± 0.92 | 4.93 ± 0.58 | 3.68 ± 0.20 |
| Cat | 519.51 ± 179.55 | 382.30 ± 90.06 | 255.82 ± 68.72 |
| B2 | 139.29 ± 43.04 | 95.88 ± 10.09 | 39.15 ± 4.14 * |
| EGCG | N.D. | 99.47 ± 6.45 | N.D. |
| Ecat | 276.45 ± 98.22 | 162.42 ± 46.17 | 241.48 ± 14.81 |
| Chl EQ1 | 797.05 | 853.16 ± 57.44 | 176.31 ± 6.69 * |
| Chl | N.D. | N.D. | N.D. |
| Rvt | N.D. | N.D. | N.D. |
| pCou | N.D. | N.D. | N.D. |
| Mv3G EQ1 | 34.38 ± 11.23 | 133.81 ± 10.29 * | N.D. |
| Cy3R | 79.57 ± 8.81 | 159.83 ± 6.20 * | 161.31 ± 11.97 * |
| Mv3G | 1116.80 ± 67.21 | 1534.89 125.26 * | 887.14 ± 57.14 * |
| Mv3G EQ2 | 36.95 ± 10.36 | 53.36 ± 15.01 | N.D. |
| Mv3G EQ3 | 69.58 ± 1.50 | 79.52 ± 10.42 | N.D. |
| Mv3G EQ4 | 198.09 ± 28.08 | 199.30 ± 31.98 | 42.39 ± 5.22* |
| Rut | 157.72 ± 20.31 | 117.13 ± 13.26 * | 60.81 ± 11.6 * |
| Rut EQ1 | 318.48 ± 63.43 | 172.48 ± 13.57 * | 116.17 ± 19.60 * |
| Rut EQ2 | 111.03 ± 21.27 | 82.49 ± 4.01 | N.D. |
Abbreviations: Total polyphenol content (TPC); total anthocyanin content (TAC); total flavanol content (TFC); not detected (n.d.); (+)-catechin (Cat); procyanidin dimer B2 (B2); (−)-epigallocatechin gallate (EGCG); (−)-epicatechin (Ecat); chlorogenic acid equivalent 1 (Chl Eq1); chlorogenic acid (Chl); resveratrol (Rvt); p-coumaric acid (pCou); malvidin-3-O-glucoside equivalent 1 (Mv3G Eq1); cyanidin-3-rutinoside (Cy3R); malvidin-3-O-glucoside (Mv3G); malvidin-3-O-glucoside equivalent 2 (Mv3G Eq2); malvidin-3-O-glucoside equivalent 3 (Mv3G Eq3); malvidin-3-O-glucoside equivalent 4 (Mv3G Eq4); rutin (Rut); rutin equivalent 1 (Rut Eq1); and rutin equivalent 2 (Rut Eq2). * represents significant differences with CG by Student’s t-test (p < 0.05). Results are expressed as mg of phenolic component per kilogram of dry weight ± SD (n = 3). 1 Generic polyphenol variables. The results are expressed as mg of phenolic component per gram of dry weight ± SD (n = 3).