Table 4.
Main characteristics of polyphenols identified in the rocket, spinach and/or watercress byproducts.
| Group of Phenolic Antioxidants | Phenolic Antioxidants | Chemical Formula | Retention Time (min) | λ max (nm) |
|---|---|---|---|---|
| Hydroxycinnamic acid | ||||
| Phenolic acids | Chlorogenic acid | C16H18O9 | 27.2 | 326.0 |
| Caffeic acid | C9H8O4 | 31.0 | 323.6 | |
| p-coumaric acid | C9H8O3 | 39.9 | 309.3 | |
| Ferulic acid | C10H10O4 | 42.4 | 322.4 | |
| Trans-ferulic acid | C10H10O4 | 42.6 | 322.4 | |
| Flavonols | ||||
| Quercetin-3-glucoside | C15H10O7 | 49.9 | 343.9 | |
| Flavones | ||||
| Flavanoids | Luteolin-7-O-glucoside | C15H10O6 | 48.3 | 354.7 |
| Rutin | C27H30O16 | 49.8 | 353.5 | |
| Apigenin | C15H10O5 | 53.7 | 268.0 | |
| Flavanols (cathecin) | ||||
| Epigallocatechin gallate | C22H18O11 | 29.4 | 276.1 |