Table 3.
Phenolic compounds in poplar bud samples obtained by LC-MS analysis.
| Peak No. | Retention Time Rt (min) | [M+H]+ (m/z) | UV λmax (nm) | Compound | Subclass |
|---|---|---|---|---|---|
| 1 | 2.96 | 155 | 278 | Dihydroxybenzoic acid | Hydroxybenzoic acid |
| 2 | 9.78 | 155 | 280 | Protocatechuic acid | Hydroxybenzoic acid |
| 3 | 10.28 | 355, 163 | 322 | 3-Caffeoylquinic acid (Neochlorogenic acid) |
Hydroxycinnamic acid |
| 4 | 11.89 | 355, 163 | 322 | 5-Caffeoylquinic acid (Chlorogenic acid) |
Hydroxycinnamic acid |
| 5 | 12.52 | 181, 163 | 320 | Caffeic acid | Hydroxycinnamic acid |
| 6 | 13.52 | 475, 181 | 320 | Chicoric acid | Hydroxycinnamic acid |
| 7 | 15.90 | 447, 271 | 312, 240 | Apigenin-glucuronide | Flavone |
| 8 | 17.21 | 477 | 310, 240 | Chrysoeriol -glucuronide | Flavone |
| 9 | 20.31 | 389 | 320, 230 | Tremuloidin | Salicin benzoate ester |
| 10 | 22.17 | 287 | 278 | Salicin | Hydroxybenzoic acid |
| 11 | 22.81 | 271 | 312, 290 | Pinostrobin | Flavanone |
| 12 | 25.64 | 529 | 290, 230 | Tremulacin | Salicin ester |