Table 5.
Identification of 20 compounds detected in Hawk primary leaf tea by UPLC-Q-TOF-MS.
| No. | Identification | Rt. (min) | UV λmax (nm) | Formula | Quasi-Molecular ES- | (ES-)MSE Ions (m/z) | ||
|---|---|---|---|---|---|---|---|---|
| Calc. Mass | Measured Mass | Error (ppm) | ||||||
| 1 | epicatechin-(4-8)-epicatechin | 4.63 | 203 279 | C30H26O12 | 577.1346 | 577.1352 [M − H]− | 1 | 425.0876, 407.0754, 289.0692, 245.0478 |
| 2 | catechin | 5.09 | 203 278 | C15H14O6 | 289.0712 | 289.0711 [M − H]− | −0.7 | 245.0816, 203.0692, 137.0236 |
| 3 | epicatechin-(4-6)-epicatechin | 5.82 | 201 279 | C30H26O12 | 577.1346 | 577.1354 [M − H]− | 1.4 | 425.0876, 407.0779, 289.0707, 245.0478 |
| 4 | epiafzelechin-(4-8)-epicatechin | 6.19 | 198 278 | C30H26O11 | 561.1397 | 561.1401 [M − H]−− | 0.7 | 425.0872, 407.0774, 289.0714, 271.0599 |
| 5 | epicatechin | 7.21 | 202 278 | C15H14O6 | 289.0712 | 289.0717 [M − H]− | 1.7 | 245.0802, 203.0689, 137.0156 |
| 6 | epiafzelechin-epiafzelechin-epicatechin | 8.03 | 196 278 | C45H38O16 | 833.2082 | 833.2103 [M − H]− | 2.5 | 561.1407, 543.1275, 407.0939, 289.0724, 271.0651 |
| 7 | hyperoside | 12.45 | 254 354 | C21H20O12 | 463.0877 | 463.0877 [M − H]− | −0.4 | 301.0302, 151.0022 |
| 8 | isoquercitrin | 13.02 | 255 353 | C21H20O12 | 463.0877 | 463.0878 [M − H]− | 0.2 | 301.0323, 151.0018 |
| 9 | quercitrin | 14.70 | 264 347 | C21H20O11 | 447.0927 | 447.0929 [M − H]− | 0.4 | 301.0318, 151.0016 |
| 10 | astragalin | 16.21 | 264 346 | C21H20O11 | 447.0927 | 447.0936 [M − H]− | 2 | 285.0398, 151.0018 |
| 11 | quercetin-3-O-α-l-rhamnoside | 16.37 | 255 348 | C21H20O11 | 447.0927 | 447.0911 [M − H]− | −3.6 | 301.0337, 151.0027 |
| 12 | dihydrokaempferol-3-O-β-d-glucopyranoside | 18.62 | 199 | C21H22O11 | 449.1084 | 449.1073 [M − H]− | −2.4 | 287.0551, 151.0028 |
| 13 | kaempferol-3-O-α-l-rhamnoside | 20.51 | 212 264 | C21H20O10 | 431.0978 | 431.0983 [M − H]− | 1.2 | 285.0404, 151.0017 |
| 14 | dihydrokaempferol | 21.72 | 199 287 | C15H12O6 | 287.0556. | 287.0543 [M − H]− | −4.5 | 151.0017, 135.0436 |
| 15 | quercetin-3-O-β-d-rutinose | 21.95 | 255 248 | C30H26O14 | 609.1244 | 609.1246 [M − H]− | 0.2 | 463.0860, 301.0325, 151.0017 |
| 16 | quercetin | 22.24 | 255 347 | C15H10O7 | 301.0348 | 301.0330 [M − H]− | −1.8 | 285.0398, 151.0018 |
| 17 | kaempferol-3-O-β-d-(6-O-trans-p-coumaroyl)-glucopyranoside | 22.51 | 266 313 | C30H26O13 | 593.1295 | 593.1310 [M − H]− | 2.5 | 447.0961, 285.0400, 151.0016 |
| 18 | kaempferol-3-O-β-d-(6-O-trans-p-coumaroyl)-mannoside | 22.69 | 266 312 | C30H26O13 | 593.1295 | 593.1310 [M − H]− | 2.5 | 447.0961, 285.0400, 151.0016 |
| 19 | dihydrokaempferol-3-O-β-d-(6-O-trans-p-coumaroyl)-glucopyranoside | 23.49 | 266 313 | C30H28O13 | 595.1452 | 595.1467 [M − H]− | 0.8 | 449.1109, 287.0541, 151.0020 |
| 20 | dihydrokaempferol-3-O-β-d-(6-O-trans-p-coumaroyl)-mannoside | 24.31 | 266 313 | C30H28O13 | 595.1452 | 595.1467 [M − H]− | 0.8 | 449.1109, 287.0541, 151.0020 |