Table 1.
The compounds identified in P1–P4 fractions by LC-MS/MS.
| Peak | Compound Number | Mode | Mass | m/z | * Molecular Formula | Auto MS-MS Fragment Ions | * Tentative Identification |
|---|---|---|---|---|---|---|---|
| P1 | 1 | pos | 290.0792 | 291.0869 | C15H14O6 | 139.0388; 123.044 | EC (Epicatechin) [20,21] |
| neg | 290.1537 | 289.1464 | 245.0816; 125.0243 | ||||
| P2 | 2 | pos | 578.1425 | 579.1498 | C30H26O12 | 127.0391; 291.0866; 409.0920 | PA (Proanthocyanidin) B2 [22] |
| neg | 578.1418 | 577.1345 | 125.0244; 289.0713; 407.0778 | ||||
| P3 | 3 | pos | 864.1899 | 887.1792 | C45H36O18 | 289.0714; 425.0902; 577.1345; 713.1506 | Pavetannin B2 (Trimers of complex Proanthocyanidin A and B) [23] |
| neg | 864.1899 | 863.1867 | 125.0244; 289.0717; 423.0712; 575.1186; 711.1357 | ||||
| 4 | pos | 866.2053 | 889.1945 | C45H38O18 | 289.0706; 601.1310; 717.1510 | Litchitannin B1 (Trimers of Proanthocyanidin B) | |
| neg | - | - | - | ||||
| P4 | 5 | pos | - | - | C30H24O12 | - | 2 × PA(A) (Dimers of Proanthocyanidin A) [24] |
| neg | 576.1257 | 575.1184 | - | ||||
| 6 | pos | 866.2056 | 867.2129 | C45H38O18 | 247.0601; 289.0705; 427.1025; 579.1492; 715.1647 | Litchitannin B2 (Trimers of Proanthocyanidin B) | |
| neg | 866.2053 | 865.1981 | 125.0243; 287.0556; 407.0755; 575.1187; 713.1531 | ||||
| 7 | pos | 864.1902 | 865.1974 | C45H36O18 | 287.0550; 411.1073; 533.1076; 575.1179; 713.1497 | 3 × PA(A&B) (Trimers of complex Proanthocyanidin A and B) [23] | |
| neg | 864.1899 | 863.1826 | 125.0247; 289.0716; 411.0720; 573.1025; 711.1346 | ||||
| 8 | pos | 848.1951 | 849.2023 | C45H36O17 | 287.0557; 517.1125; 713.1504 | Trimeric PA (with an afzelechin or epiafzelechin) [23] | |
| neg | 848.1948 | 847.1875 | 289.0710; 411.0723; 557.1095 | ||||
| 9 | pos | 864.1905 | 865.1979 | C45H36O18 | 287.0551; 425.0869; 577.1336; 713.1497 | 3 × PA (A&B) [23] | |
| neg | 864.1899 | 863.1827 | 125.0243; 285.0404; 575.1201; 711.1362 | ||||
| 10 | pos | 576.127 | 577.1342 | C30H24O12 | 123.0440; 287.0549; 425.0864 | Procyanidin A2 [25] |
* The molecular formula and the compounds were deduced based on searching the m/z and MS/MS spectra in the Meltin database and compound information in the references. - For some compounds, whose negative or positive modes were not achived successfully.