Table 6.
Quantification of total phenolic compounds, total anthocyanins, and antioxidant activity (n = 3) extracted by the multi-response developed UAE method to an assortment of onion varieties.
| Onion Type | Peak 1 (mg g−1) |
Peak 2 (mg g−1) |
Peak 3 (mg g−1) |
Peak 4 (mg g−1) |
Peak 5 (mg g−1) |
Peak 6 (mg g−1) |
Peak 7 (mg g−1) |
Peak 8 (mg g−1) |
Peak 9 (mg g−1) |
TA (mg g−1) |
CFT (mg g−1) |
Antioxidant Activity (mg g−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Spring white onion I | - | - | - | - | - | - | - | - | - | - | 6.01 ± 0.09 | 4.64 ± 0.13 |
| French white onion | - | - | - | - | - | - | - | - | - | - | 6.71 ± 0.18 | 4.46 ± 0.15 |
| Sweet white onion I | - | - | - | - | - | - | - | - | - | - | 2.98 ± 0.04 | 3.49 ± 0.06 |
| Spring white onion II | - | - | - | - | - | - | - | - | - | - | 4.34 ± 0.02 | 3.26 ± 0.76 |
| Sweet white onion II | - | - | - | - | - | - | - | - | - | - | 2.74 ± 0.00 | 3.72 ± 0.16 |
| CYO white onion | - | - | - | - | - | - | - | - | - | - | 4.84 ± 0.04 | 6.92 ± 0.12 |
| Sweet white onion III | - | - | - | - | - | - | - | - | - | - | 5.40 ± 0.12 | 4.88 ± 0.98 |
| White onion | - | - | - | - | - | - | - | - | - | - | 3.31 ± 0.07 | 5.63 ± 0.31 |
| Babosa white onion | - | - | - | - | - | - | - | - | - | - | 5.78 ± 0.17 | 5.91 ± 0.10 |
| Sweet white onion IV | - | - | - | - | - | - | - | - | - | - | 3.30 ± 0.02 | 2.93 ± 0.03 |
| Fuentes white onion | - | - | - | - | - | - | - | - | - | - | 3.64 ± 0.01 | 4.07 ± 0.32 |
| Yellow onion I | - | - | - | - | - | - | - | - | - | - | 5.41 ± 0.17 | 5.41 ± 0.34 |
| Yellow onion II | - | - | - | - | - | - | - | - | - | - | 3.56 ± 0.03 | 6.14 ± 0.63 |
| Yellow onion III | - | - | - | - | - | - | - | - | - | - | 3.53 ± 0.02 | 6.15 ± 0.07 |
| Yellow onion IV | - | - | - | - | - | - | - | - | - | - | 5.00 ± 0.00 | 3.93 ± 0.10 |
| Yellow onion V | - | - | - | - | - | - | - | - | - | - | 5.61 ± 0.11 | 3.41 ± 0.16 |
| Purple onion | 0.43 ± 0.00 | 0.19 ± 0.00 | 0.04 ± 0.00 | 0.02 ± 0.00 | 0.04 ± 0.00 | 0.98 ± 0.02 | 0.27 ± 0.06 | 0.09 ± 0.00 | 0.02 ± 0.00 | 2.28 ± 0.05 | 7.97 ± 0.03 | 5.96 ± 0.01 |
| Red onion I | 0.20 ± 0.00 | 0.19 ± 0.00 | 0.03 ± 0.00 | 0.02 ± 0.00 | 0.03 ± 0.00 | 0.33 ± 0.01 | 0.23 ± 0.01 | 0.09 ± 0.00 | 0.04 ± 0.00 | 1.36 ± 0.03 | 6.70 ± 0.08 | 5.14 ± 0.16 |
| Red label onion | 0.24 ± 0.00 | 0.20 ± 0.01 | 0.04 ± 0.00 | 0.02 ± 0.00 | 0.03 ± 0.01 | 0.34 ± 0.00 | 0.24 ± 0.02 | 0.12 ± 0.01 | 0.05 ± 0.00 | 1.46 ± 0.04 | 8.01 ± 0.12 | 6.03 ± 0.01 |
| Red onion II | 0.53 ± 0.02 | 0.27 ± 0.01 | 0.02 ± 0.00 | 0.05 ± 0.0 | 0.06 ± 0.01 | 0.66 ± 0.07 | 0.34 ± 0.03 | 0.17 ± 0.01 | 0.06 ± 0.00 | 2.39 ± 0.05 | 7.23 ± 0.08 | 5.35 ± 0.00 |
| Red onion III | 0.31 ± 0.02 | 0.16 ± 0.01 | 0.05 ± 0.00 | 0.03 ± 0.0 | 0.04 ± 0.00 | 0.54 ± 0.03 | 0.23 ± 0.01 | 0.22 ± 0.00 | 0.07 ± 0.00 | 1.64 ± 0.05 | 6.52 ± 0.08 | 7.03 ± 0.67 |
| Red onion IV | 0.10 ± 0.01 | 0.09 ± 0.01 | 0.04 ± 0.00 | 0.03 ± 0.00 | 0.23 ± 0.00 | 0.07 ± 0.00 | 0.12 ± 0.00 | 0.03 ± 0.00 | 0.02 ± 0.00 | 0.93 ± 0.01 | 4.54 ± 0.05 | 7.25 ± 0.12 |
| Purple onion II | 0.10 ± 0.00 | 0.17 ± 0.00 | 0.04 ± 0.00 | 0.03 ± 0.00 | 0.04 ± 0.00 | 0.46 ± 0.01 | 0.38 ± 0.00 | 0.07 ± 0.00 | 0.03 ± 0.00 | 1.54 ± 0.02 | 4.30 ± 0.00 | 6.43 ± 0.01 |
| Figueres Onion | 0.02 ± 00 | 0.03 ± 0.0 | 0.02 ± 0.00 | 0.01 ± 0.0 | 0.05 ± 0.02 | 0.02 ± 0.01 | 0.06 ± 0.02 | 0.03 ± 0.01 | 0.02 ± 0.00 | 0.59 ± 0.00 | 7.50 ± 0.29 | 7.10 ± 0.53 |