Table 1.
Phenolic compounds from Ch-PRE. Peak assignment accordingly profile in Figure 1, retention time (RT), mass spectral and concentration. Compounds identified by LC-MS/MS.
| Peak | RT (min) | [M − H]− m/z 1 | MS/MS m/z 1 | Assigned Identity | Concentration 2 (mg·g−1 dw) |
|---|---|---|---|---|---|
| 1 | 18.28 | 353 | MS2 [353]: 135, 179, 195 | Neochlorogenic acid | 19.49 |
| 2 | 23.43 | 289 | MS2 [289]: 245, 205, 125, 109 | Catechin | 6.66 |
| 3 | 26.33 | 353 | MS2 [353]: 135, 179, 195 | Chlorogenic acid | 1.83 |
| 4 | 33.97 | 577 | MS2 [577]: 289, 125 | Procyanidin B2 | 0.98 |
| 8 | 51.91 | 609 | MS2 [609]: 301 | Quercetin-3-rutinoside | 17.00 |
| 9 | 52.85 | 463 | MS2 [463]: 301 | Quercetin-3-glucoside | 1.74 |
| 10 | 58.01 | 447 | MS2 [447]: 285 | Kaempferol-3-glucoside | 0.97 |
| 11 | 72.34 | 447 | MS2 [447]: 285 | Sakuranin | * |
| 12 | 92.12 | 285 | MS2 [285]: 243, 164 | Isosakuranetin | * |
1 Detection of [M − H]− and fragmentation experiments for identification were performed in the LC-MS/MS system; 2 Quantification experiments were performed in the HPLC-DAD-ED equipment, and conditions of analysis were as described in the Experimental Section; * Tentatively identified without using standards.