Table 1.
Retention time (Rt), wavelengths of maximum absorption in the visible region (λmax), mass spectral data and tentative identification of phenolic compounds in L. pedunculata samples.
| Peak | Rt (min) | λmax (nm) | [M-H]− (m/z) | MS2 (m/z) | Tentative Identification | Identification Type |
|---|---|---|---|---|---|---|
| 1 | 5.97 | 320 | 341 | 179(100) | Caffeic acid hexoside | [12], DAD/MS |
| 2 | 6.57 | 320 | 341 | 179(100) | Caffeic acid hexoside | [12], DAD/MS |
| 3 | 8.65 | 310 | 325 | 163(100) | p-Coumaroyl hexoside | [12], DAD/MS |
| 4 | 10.16 | 320 | 179 | 119(100) | Caffeic acid | Standard/DAD/MS |
| 5 | 13.22 | 332 | 623 | 461(27), 285(100) | Luteolin-O-hexosyl-O-glucuronide | [20], DAD/MS |
| 6 | 16.34 | 284,330 sh | 463 | 287(100) | Eriodictyol-O-glucuronide | [21], DAD/MS |
| 7 | 17.64 | 320 | 521 | 359(100), 197(8), 179(14), 161(3), 135(5) | Rosmarinic acid hexoside | [22], DAD/MS |
| 8 | 18.68 | 347 | 461 | 285(100) | Luteolin-7-O-glucuronide | Standard/DAD/MS |
| 9 | 19.23 | 283,338 sh | 719 | 539(29), 521(18), 359(100), 179(32), 161(5), 135(5) | Sangerinic acid | [16], DAD/MS |
| 10 | 22.29 | 325 | 359 | 197(27), 179(37), 161(100), 135(5) | Rosmarinic acid | Standard/DAD/MS |
| 11 | 23.19 | 288,328 sh | 537 | 493(18), 359(100), 313(11), 295(5), 197(3), 179(3) | Lithospermic acid A | [17,18,19], DAD/MS |
| 12 | 24.65 | 340 | 475 | 299(100), 284(68) | Methylluteolin-O-glucuronide | [21], DAD/MS |
| 13 | 25.75 | 309,338sh | 717 | 537(47), 519(17), 493(40), 359(97), 339(10), 321(8), 313(17), 295(100), 197(7), 179(27) | Salvianolic acid B | [18,19], DAD/MS |