Table 1.
Identification of phytochemicals in Q. acuta by UPLC-MS/MS analysis.
| No | tR (min) | Molecular Formula | Precursor Ion (m/z) | Error (ppm) | MS/MS Fragments (m/z) | Identifications | ||
|---|---|---|---|---|---|---|---|---|
| Adduct | Expected | Measured | ||||||
| 1 | 5.07 | C15H14O6 | [M-H]− | 289.0718 | 289.0715 | −0.89 | 289, 245, 205, 125 | Catechin [18] a |
| 2 | 5.21 | C16H18O9 | [M+COOH-H]− | 399.0933 | 399.0930 | −0.81 | 191 | Chlorogenic Acid [32] a |
| 3 | 5.34 | C16H18O10 | [M-H]− | 369.0827 | 369.0822 | −1.45 | 369, 207, 192 | Fraxin [31] a |
| 4 | 6.67 | C21H20O12 | [M-H]− | 463.0882 | 463.0878 | −0.80 | 463, 300, 301, 151 | Isoquercitrin [33] a |
| 5 | 6.99 | C15H12O7 | [M-H]− | 303.0510 | 303.0508 | −0.92 | 285, 177, 125 | Taxifolin [18] a |
a Compared with the retention time and MS spectral data of an authentic standards.