Table 1.
Identification of compounds in PPE of Red Delicious apple skin by reversed phase HPLC-UV-Vis-DAD-ESI/MS.
| Compounds | Rt (min) | Molecular ions (m/z) | Fragments (m/z) | UV-Vis(nm) |
|---|---|---|---|---|
| Flavan-3-ols Monomers | ||||
| (-)-Epicatechin (E) | 28.38 | 289 | - | 280 |
| (+)-Catechin (C) | 21.45 | 289 | - | 280 |
| Oligomers | ||||
| Procyanidin B1 (dimer) (PB1) | 18.33 | 577 | 407, 289 | 280 |
| Procyanidin B2 (dimer) (PB2) | 25.35 | 577 | 451,425, 407, 289 | 280 |
| Procyanidin C1 (trimer) (PC1) | 30.93 | 865 | 847, 739, 713, 695, 577, 451, 425, 407, 287 | 280 |
| Trimer 2 (T2) | 22.32 | 865 | 847, 713, 695, 577, 451, 425, 407, 289, 287 | 280 |
| Trimer 3 (T3) | 24.89 | 865 | 577, 451, 407, 289, 287 | 280 |
| Tetramer 1 (TT1) | 26.69 | 1153 | 983, 863, 739, 577, 575, 407, 289 | 280 |
| Tetramer 2 (TT2) | 32.23 | 1153 | 983, 865, 577, 407, 289 | 280 |
| Tetramer 3 (TT3) | 32.67 | 1153 | 983, 865, 577, 575, 451, 289, 287 | 280 |
| Tetramer 4 (TT4) | 35.39 | 1153 | 865, 863, 739, 577, 575, 425, 289 | 280 |
| Pentamer 1 (P1) | 29.99 | 1441 | 1315, 1153, 1151, 863, 575, 450, 289 | 280 |
| Pentamer 2 (P2) | 33.20 | 1441 | 1272, 1154, 1027, 865, 575, 407, 289, | 280 |
| Hexamer (H1) | 33.65 | 1729 | 1443, 863, 575, 289 | 280 |
| Heptamer (HP1) | 35.83 | 2017 | 1730, 1153, 863, 739, 575, 289 | 280 |
| Unknown 1 (U1) | 7.09 | 447 | 370, 285 | 236, 282 |
| Unknown 2 (U2) | 9.23 | 447 | 384, 285 | 236, 284 |
| Flavonols | ||||
| Kaempferol pentoside(KP) | 37.81 | 417 | 285, 341 | 266, 352 |
| Rutin (RU) | 38.21 | 609 | 301 | 352 |
| Quercetin galactoside (QGO) | 38.44 | 463 | 301 | 350 |
| Quercetin glucoside (QGL) | 38.67 | 463 | 301 | 352 |
| Quercetin pentoside (QP) | 39.27 | 433 | 301 | 352 |
| Quercetin pentoside (QP) | 39.83 | 433 | 301, 567 | 354 |
| Quercetin ramnoside (QR) | 40.01 | 447 | 300 | 350 |
| Ramnetin pentoside (RP) | 40.99 | 447 | 314 | 348 |
| Dihydrochalcones | ||||
| Phloretin pentoside (FLP) | 39.65 | 567 | 162, 273 | 238, 284 |
| Phloridzin (FL) | 40.81 | 435 | 167, 273 | 236, 284 |
| Phenolic acids | ||||
| Chlorogenic acid (AC) | 24.47 | 353 | 191, 225 | 240, 292 |
| Anthocyanidins | ||||
| Cyanidin glucoside (CGL) | 30.25 | 447 | 284 | 280, 516 |