Table 3.
Phytochemical composition of MTBE extracts produced from Centaurea scabiosa L. flowers.
| Peak No. | [M-H]-m/z Molecular Formula |
Proposed Compound |
|---|---|---|
| 1 | 153.0182 C7H5O4 |
Protocatechuic acid (phenolic acid) |
| 2 | 353.0885 C16H17O9 |
3-Caffeoylquinic acid (flavonoid ester) |
| 3 | 353.0893 C16H17O9 |
5-Caffeoylquinic acid (flavonoid ester) |
| 4 | 179.0342 C9H7O4 |
Caffeic acid (phenolic acid) |
| 5 | 195.1981 C12H20O2 |
L-bornyl acetate (terpene ester) |
| 6 | 463.0885 C21H19O12 |
Quercetin-3-O-glucoside (flavonoid) |
| 7 | 593.1512 C27H29O15 |
Luteolin-7-O-rutinoside (flavonoid) |
| 8 | 447.0926 C21H19O11 |
Luteolin-7-O-glucoside (flavonoid) |
| 9 | 301.0353 C15H9O7 |
Quercetin (flavonoid) |
| 10 | 269.0453 C15H9O6 |
Apigenin (flavonoid) |
| 11 | C19H21O7 361.0721 |
Repin (flavonoid) |
| 12 | 285.0401 C15H9O6 |
Luteolin (flavonoid) |
| 13 | 333.0126 C18H21O6 |
Cynaropikrin (sesquiterpene lactone) |
| 14 | 263.0328 C15H19O4 |
Grossgemin (sesquiterpene lactone) |