Table 1.
UV-vis and mass spectral characteristics of the main polyphenolic phytochemicals detected in the Bt extracts of S. mucronata.
| Peak | Rt (min) | λmax (nm) | [M + H]+ (m/z) | Other Ions (m/z) | Tentative Identity |
|---|---|---|---|---|---|
| 1 | 16.39 | 298 (s), 322 | 779 | 765, 751, 731, 503, 489, 457, 355, 163 | Chlorogenate derivative |
| 2 | 24.68 | 242, 292 (s), 344 | 763 | 627, 465, 441, 393, 371, 303 | Quercetin derivative |
| 3 | 25.11 | 250, 348 | 449 | 287 | Luteolin glucoside |
| 4 | 26.32 | 278, 300 (s), 344 | 653 | 611, 287 | Luteolin derivative |
| 5 | 26.52 | 242, 374 (s), 392 | 669 | 653, 517, 303 | Quercetin derivative |
| 6 | 26.72 | 272, 300, 330 | 653 | 449 | Isoscutellarein acetylallosylglucoside |
| 7 | 26.88 | 265, 340 | 433 | 271 | Apigenin C-glucoside |
| 8 | 29.03 | 270, 304 (s), 358 | 653 | 287 | Luteolin derivative |
| 9 | 29.73 | 252, 280, 344 | 695 | 653, 287 | Luteolin derivative |
| 10 | 32.74 | 234, 336 | 579 | 447, 271 | Apigenin derivative |
| 11 | 33.73 | 264, 302 (s), 364 | 695 | 717 [M + Na]+, 287 | Luteolin derivative |
| 12 | 33.97 | 232, 276, 306, 332 | 695 | 717 [M + Na]+, 287 | Luteolin derivative |
| 13 | 34.35 | 234, 268, 316, 344 | 579 | 601 [M + Na]+, 271 | Apigenin derivative |