Table 3. Data from HPLC-DAD-ESI-MS/MS for characterization of potential antioxidant components in E1.
| Peaka | t R a (min) | [M+Na]+ (m/z) | [M+H]+ (m/z) | [2M+Na]+ (m/z) | MS/MS (m/z) | UV λmax (nm) | Assigned identity |
| 1 | 6.334 | -b | 497 | - | 477, 335 | 254 | Oxypaeoniflora |
| 3 | 17.047 | - | 291 | - | 280 | Catechin | |
| 6 | 34.198 | - | 447 | 915 | 285 | 225, 248, 282 | Calycosin-7-O-β-D-glucopyranoside |
| 7 | 45.616 | - | 431 | - | 269 | 250, 258 | Fomononetin-7- O-β-D-glucopyranoside |
| 9 | 49.212 | 485 | - | - | 301 | 229, 284, 344 | 9,10-dimethoxy-pterocarpan-3-O-β-D-glycoside |
| 10 | 50.967 | 487 | - | - | 482, 303 | 280 | 2′-dihydroxy-3′,4′-dimethyl-isoflavan-7-O-β-D-glucopyranoside |
| 20 | 69.749 | - | 303 | - | 285, 257, 167 | 254, 370 | Quercetin |
a
Peak numbers and retentions time refer to Fig.4.
b
-, not detected.