Table 5.
Identification of phenolics and derivatives in 80% methanol seed coat extracts by LC-MS/MSa
| Compound | Rt min | MW | MS, m/z M (+/−) | MS/MS, m/z (relative intensity) | ref/std | |
|---|---|---|---|---|---|---|
| Hydroxycinnamic acids | ||||||
| p-Coumaric acid hexose | 4.5 | 326 | 325 (−) | 145(100) | 163(94), 119(12) | ref |
| p-Coumaric acid | 8.4 | 164 | 163 (−) | 119(100) | ref | |
| Ferulic acid derivative | 19.8 | 398 | 397 (−) | 295(100) | 337(30), 325(18), 265(14), 193(3) | ref |
| Benzyl alcohol derivatives | ||||||
| Benzyl alcohol hexose pentose | 5.3 | 402 | 401 (−) | 269(100) | 161(25), 125(7), 293(3) | ref |
| Flavonoids | ||||||
| Procyanidin dimer (type B1 or B2) | 3.0 | 578 | 577 (−) | 425(100) | 407(81), 451(50), 289(34) | ref |
| (epi)catechin-(epi)gallocatechin | 3.4 | 594 | 593 (−) | 407(100) | 425(74), 305(73), 467(52), 289(50) | ref |
| Procyanidin trimer | 4.0 | 866 | 865 (−) | 695(100) | 577(55), 407(32), 287(22), 289 (11) | ref |
| Catechin | 6.6 | 290 | 289 (−) | 245(100) | 205(30) | std |
| Unknown tannin | 8.3 | 577 | 576 (−) | 289(100) | 451(74), 287(72), 559(71), 425(30) | - |
| Epicatechin | 8.6 | 290 | 289 (−) | 245(100) | 206(61), 205(41), 272 (17) | std |
| Procyanidin trimer | 8.7 | 866 | 865 (−) | 525(100) | 695(70), 577(54), 289(25) | ref |
| Procyanidin dimer | 8.8 | 578 | 577 (−) | 407(100) | 425(75), 289(52), 451(39), 559(35) | ref |
| Unknown tannin | 8.9 | 596 | 595 (−) | 545(100) | 287(62), 272(47), 461(45) | - |
| Procyanidin dimer (type A) | 9.1 | 576 | 575 (−) | 449(100) | 488(60), 433(59), 226(57), 177(32),423(26), 287(23) | ref |
| Procyanidin trimer | 10.2 | 866 | 865 (−) | 407(100) | 740(73), 577(69), 847(43), 467(39) | ref |
| Rutin | 19.4 | 610 | 609 (−) | 301(100) | 447(34), 373(20), 271(18), 255(14) | ref |
| Stilbenes | ||||||
| Resveratrol derivative b | 17.5 | 536 | 535 (−) | 227(100) | 307(4) | ref |
a
Rt, retention time; +/− indicates positive ion/negative ion mode; ref/std, compared to references/standards.
b
Molecular ions characteristic of resveratrol or resveratrol derivatives.