Table 2.
Content of some phenolic compounds in stalks of cardoon (Cynara cardunculus var. altilis DC cv. Pieno Inerme Lucchese; PIL and Cynara cardunculus var. altilis DC cv. Plain Blanc Inerme; PBI) cultivated in the field. Mean values, mg g−1 DW, (±SE; n = 3) followed by different letters differ significantly (p ≤ 0.05).
| Cardoon Cultivar | Treatment | 1 Monocaffeoylquinic Acid | Caffeic Acid | 1 Monocaffeoylquinic Acid Dimer | 1 Dicaffeoylquinic Acid | Luteolin Glucoside |
|---|---|---|---|---|---|---|
| Pieno Inerme Lucchese (PIL) | Control | <LOD | <LOD | <LOD | <LOD | <LOD |
| Blanching | <LOD | <LOD | <LOD | <LOD | <LOD | |
| Blanching+Boiling | 11.54 ± 0.85 | 3.12 ± 0.36 | 43.54 ± 1.08 | 29.67 ± 1.15 | 0.05 ± 0.09 | |
| Plain Blanc Inerme (PBI) | Control | <LOD | 0.09 ± 0.05 | 42.20 ± 0.76 a | 13.30 ± 0.61 a | 0.035 ± 0.06 |
| Blanching | <LOD | <LOD | 19.12 ± 0.48 b | 5.01 ± 0.50 b | <LOD | |
| Blanching+Boiling | 0.77 ± 0.31 | 0.14 ± 0.08 | 3.26 ± 0.86 c | 11.91 ± 1.39 a | 0.02 ± 0.08 | |
| Significance (ANOVA) | ns | *** | *** | ns |
<LOD: under the limit of detection; 1 determined with caffeic acid equivalent; significance level: *** p ≤ 0.001, ns: non-significant.