Table 3.
Characterization and tentative identification of markers 1–6 using UPLC-ESI QTOF MS in negative mode.
| Marker No. | tR (min) | Observed mass (m/z) | Calculated Mass (m/z) | Error (ppm) | Molecular formula | Identification1 |
|---|---|---|---|---|---|---|
| 1 | 19.13 | 325.1838 | 325.1804 | 10.5 | C21H26O3 | Heptaethylene glycol |
| 2 | 21.10 | 339.1989 | 339.1960 | 8.5 | C22H28O3 | Heptaethylene glycol monomethyl ether |
| 3 | 19.30 | 293.1795 | 293.1753 | 14.3 | C17H26O4 | 6-Gingerol |
| 4 | 15.40 | 265.1470 | 265.1440 | 11.3 | C15H22O4 | 4-Gingerol |
| 5 | 19.57 | 293.1784 | 293.1753 | 10.6 | C17H26O4 | Phytuberin |
| 6 | 18.93 | 555.2839 | 555.2805 | 6.1 | C28H44O11 | Unkown |