Table 5.
Identification of chemical constituents of ethylacetate fraction of N. longibracteata by LC-ESI-QTOFMS/MS in −ve ion mode
| Peak | Retention time (min) | % Area | Identificationa | ESI-MS m/z [M−H]−b | (−) ESI-MS2 m/z | Formula |
|---|---|---|---|---|---|---|
| 1 | 4.42 (ill resolved) | 5.29 | Gallic acid | 169.08 | 112.98 [TFA−H]− | C7H6O5 |
| 2 | 4.57 | 32.58 | Rosmarinic acid | 359.08 | 719.16 [2M−H]− 557.16 [M+C9H9O5 (Dhanshenshu)]− 395.04 [M+Cl−]− 197.06 [C9H9O5]− | C18H16O8 |
| 3 | 4.87 | ill resolved | Isopropyl-O-pyrocatecheic acid | 199.1 | 187.1 [M − 12]− 153.09 [M−(HCOOH)]− | C10H15O4 |
| 4 | 5.01 | 18.36 | Methylrosmarinate | 373.08 | 747.19 [2M − 1]− 733.17 [2M−CH2]− 717.17 [2M−2 CH3]− 343.08 [M−CH3]− | C19H18O8 |
| 5 | 5.29 | 12.48 | Isomer of compound 3 | 199.09 | 155.11 [M−CO2]− | C10H16O4 |
| 6 | 5.64 | 2.17 | Kaempferol | 285.03 | 571.08 [2M − 1]− 169.00 [C7H6O5]− | C15H10O6 |
| 7 | 5.99 | 0.74 | Gallic acid derivative | 479.14 | 525.14 [M+(HCOOH)]− | C23H27O11 |
| 8 | 6.3 | 2.53 | Apigenin | 269.04 | 539.10 [2M−1]− 329.06 [M + 59]− 112.98 [TFA−H]− | C15H10O5 |
| 9 | 6.69 | 1.45 | Adenosine | 266.14 | 334.13 | C10H13N5O4 |
| 10 | 6.97 | 0.54 | Derivative of phenylpropionic acid glucoside | 327.22 | 313.07 [M−CH2]− | C19H20O5 |
| 11 | 11.18 | 3.57 | Derivative of phenyl glucoside | 265.15 | 283.26 [M−H+H2O]− 168.99 [M − 96]− | C14H18O5 |
| 12 | 13.3 | 2.59 | Deprotonated TFA | 325.18 | 112.98 [TFA−H]− | C16H21O7 |
| 13 | 15.03 | 3.38 | Phenolic compound | 375.27 | 376.27 [M]− | C19H20O8 |
| 14 | 16.08 | 1.04 | 4-(3,4-Dimethoxyphenyl benzoate), pinocamberine | 255.23 | 323.22 [M + 68]− | C15H12O4 |
| 15 | 16.74 | 1.38 | 4-[2,4-Dicarboxy-3-(4-carboxylatophenyl)phenyl]benzoate | 403.31 | 723.59 | C22H12O8 |
aIdentified using free chemical database, Chem Spider
bExact mass of the parent ion