Table 1.
Peak assignments and tentative identification of the major constituents of N. nouchali flower extract by a combination of (+) mode PSI and ESI (MS/MS).
| Compound Name | MW | Elemental formula | (M + H)+ m/z observed | (M + H)+ m/z calculated | Positive ionization MS/MS |
|---|---|---|---|---|---|
| 3,4,8,9,10-pentahydroxy-dibenzo[b,d]pyran-6-one | 276.20 | C18H8O7 | 277.035 | 277.034 | 259.02, 231.02, 147.04 |
| Kaempferol | 286.23 | C15H10O6 | 287.0555 | 287.055 | 230.98, 213.05, 153.01, 121.02 |
| Chrysoeriol | 300.26 | C16H12O6 | 301.0712 | 301.071 | 286.04, 258.05, 213.05, 153.07, 121.02 |
| Isorhamnetin | 316.26 | C16H12O7 | 317.0666 | 317.066 | 301.03, 245.04, 153.01, 137.02 |
| Laricitrin | 332.25 | C16H12O8 | 333.0612 | 333.06 | 317.02, 301.03, 245.04, 153.01, 137.02 |
| Unknown | 397.0773 | ||||
| Shoyuflavone C | 418.35 | C19H14O11 | 419.0597 | 419.053 | 287.05, 153.01, 107.04 |
| di-p-coumaroylspermidine | 437.24 | C25H31N3O4 | 438.2402 | 438.239 | 292.2, 218.11, 204.1, 147.04, 119.04 |
| Isorhamnetin-3-O-xyloside | 448.26 | C21H20O11 | 449.109 | 449.108 | 317.06, 287.05, 153.01, 137.02 |
| Laricitrin-7-O- xyloside | 464.26 | C21H20O12 | 465.1039 | 465.103 | 333.06, 317.02, 301.03, 245.04, 153.01 |
| N1,N5,N10-(z)-tri-p-coumaroylspermidine | 583 | C34H37N3O6 | 584.2769 | 584.268 | 438.23, 292.20, 218.11, 204.10, 147.04 |
| Kaempferol-3-O-galactoside-7-O-rhamnoside | 594.52 | C27H30O15 | 595.1667 | 595.166 | 449.1, 287.05, 153.01, 121.02 |