Table 2.
Total phenolic acids, total flavonoid content, and antioxidant activities in green and red Salanova lettuce (S) in nutrient solutions with different macrocations concentration (C). GAE, gallic acid equivalents, RE, rutin equivalents, TE, trolox equivalents, EDTAE, ethylenediaminetetraacetic acid equivalents.
| Source of Variance | Total Phenolic Content | Total Flavonoid Content | DPPH | ABTS | CUPRAC | FRAP | Phosphomolydenum | Metal Chelating |
|---|---|---|---|---|---|---|---|---|
| (mg GAE) | (mg RE) | (mg TE) | (mg TE) | (mg TE) | (mg TE) | (mmol TE) | (mg EDTAE) | |
| Salanova (S) | ||||||||
| Green | 12.41 ± 0.28 b | 22.17 ± 1.39 a | 3.31 ± 0.86 b | 12.28 ± 0.81 b | 30.41 ± 1.47 b | 12.73 ± 0.58 b | 0.74 ± 0.02 b | 15.61 ± 0.57 b |
| Red | 22.31 ± 1.42 a | 12.80 ± 1.80 b | 22.64 ± 2.78 a | 30.94 ± 2.34 a | 69.33 ± 5.31 a | 27.30 ± 2.00 a | 1.11 ± 0.05 a | 19.52 ± 0.54 a |
| Concentration (C) | ||||||||
| Full strength | 14.87 ± 0.88 b | 21.18 ± 1.57 a | 5.71 ± 1.30 b | 16.73 ± 1.70 c | 38.98 ± 3.35 c | 15.36 ± 1.17 b | 0.85 ± 0.04 b | 16.91 ± 0.88 b |
| Half strength | 20.67 ± 2.75 a | 14.16 ± 3.02 b | 17.08 ± 5.04 a | 26.45 ± 4.83 a | 60.49 ± 10.23 a | 23.46 ± 3.82 a | 1.02 ± 0.10 a | 19.36 ± 0.93 a |
| Quarter strength | 16.55 ± 1.25 b | 17.11 ± 2.04 ab | 16.14 ± 3.26 a | 21.64 ± 2.74 b | 50.14 ± 6.05 b | 21.23 ± 2.33 a | 0.91 ± 0.07 b | 16.42 ± 0.61 b |
| C × S | ||||||||
| Green × Full strength | 12.12 ± 0.39 c | 23.07 ± 0.59 a | 1.89 ± 0.64 d | 12.33 ± 2.10 d | 28.90 ± 2.09 d | 11.71 ± 0.55 d | 0.79 ± 0.05 cd | 14.92 ± 1.02 |
| Green × Half strength | 12.57 ± 0.57 c | 23.90 ± 1.46 a | 1.70 ± 0.23 d | 11.18 ± 0.36 d | 29.58 ± 1.95 d | 12.04 ± 0.44 d | 0.74 ± 0.02 cd | 16.83 ± 1.01 |
| Green × Quarter strength | 12.54 ± 0.56 c | 19.54 ± 3.89 ab | 6.36 ± 2.07 cd | 13.34 ± 1.30 d | 32.74 ± 3.51 d | 14.45 ± 1.42 cd | 0.69 ± 0.05 d | 15.08 ± 0.89 |
| Red × Full strength | 17.61 ± 0.49 b | 19.30 ± 3.02 ab | 9.53 ± 1.08 c | 21.14 ± 0.74 c | 49.05 ± 2.10 c | 19.01 ± 0.58 c | 0.90 ± 0.05 c | 18.91 ± 0.88 |
| Red × Half strength | 28.77 ± 2.57 a | 4.42 ± 0.10 c | 32.46 ± 4.16 a | 41.73 ± 3.00 a | 91.41 ± 8.64 a | 34.87 ± 3.43 a | 1.30 ± 0.09 a | 21.89 ± 0.47 |
| Red × Quarter strength | 20.55 ± 0.44 b | 14.67 ± 0.84 b | 25.92 ± 2.07 b | 29.95 ± 1.95 b | 67.53 ± 5.28 b | 28.01 ± 1.84 b | 1.12 ± 0.03 b | 17.77 ± 0.36 |
| Significance | ||||||||
| Salanova (S) | *** | *** | *** | *** | *** | *** | *** | *** |
| Concentration (C) | *** | * | *** | *** | *** | *** | *** | ** |
| S × C | *** | ** | *** | *** | *** | *** | *** | ns |
Data are mean ± standard error; n = 6. The symbols ns, *, **, and *** indicate a nonsignificant or a significant statistical difference at p ≤ 0.05, 0.01, and 0.001, respectively. For each variable, letters indicate statistical homogenous groups according to Duncan’s multiple-range test (p = 0.05). The effects of factor Salanova were compared according to Student’s t-test.