Table 2.
Concentrations (mg/gDW) of gallic acid, catechin, chlorogenic acid, epicatechin, cynarine, sinapic acid, naringin, rutin and phlorizin (HPLC/PDA analysis) in the extracts from untreated and PEF-treated artichoke stems.
| Peak No. | Compound | Max Absorption Wavelength (nm) | Retention Time (min) | Concentration (mg/gDW) | |
|---|---|---|---|---|---|
| Untreated | PEF-Treated | ||||
| 1 | Gallic acid | 271 | 6.35 | nd | 0.02 ± 0.003 |
| 2 | Catechin | 280 | 14.36 | 0.35 ± 0.03 a | 0.89 ± 0.06 b |
| 3 | Chlorogenic acid | 320 | 14.83 | 4.70 ± 0.37 a | 6.02 ± 0.63 b |
| 4 | Epicatechin | 280 | 16.36 | 0.10 ± 0.01 a | 0.39 ± 0.07 b |
| 5 | Cynarine | 320 | 17.24 | 0.09 ± 0.01 a | 0.15 ± 0.03 b |
| 6 | Sinapic acid | 330 | 20.24 | 0.16 ± 0.02 a | 0.31 ± 0.04 b |
| 7 | Naringin | 283 | 20.93 | 2.06 ± 0.08 a | 3.46 ± 0.36 b |
| 8 | Rutin | 260 | 21.32 | 1.25 ± 0.06 a | 1.96 ± 0.07 b |
| 9 | Phlorizin | 280 | 22.61 | 0.04 ± 0.002 a | 0.20 ± 0.02 b |
Data are expressed as means (n = 3) ± SDs. Values with different lowercase letters within the same row are significantly different (p ≤ 0.05). nd: not detected.