Table 3.
Composition (total phenolics, flavonoids and condensed tannins) and antioxidant capacity (radical scavenger activity, IC50 and reductive antioxidant power, FRAP) of ethanol-water extracts of young phloems of Pinus pinaster and Pinus pinea from three sites of Portugal. Mean of six phloem samples per site and standard deviation.
| Total phenolics (mg GAE/g extract) | Total flavonoids (mg CE/g extract) | Condensed tannins (mg CE/g extract) | IC50 values (μg extract/ml)∗ | FRAP (mM TEAC/g extract) | |
|---|---|---|---|---|---|
| Pinus pinaster | |||||
| Site 1 | 373.7 ± 63.8ab | 80.0 ± 18.9 | 84.4 ± 18.1 | 1.2 ± 0.2 | 3.5 ± 0.7 |
| Site 2 | 285.2 ± 60.6ac | 64.9 ± 37.6 | 95.2 ± 34.7 | 1.5 ± 0.3 | 4.1 ± 2.4 |
| Site 3 | 660.5 ± 178.6ad | 115.0 ± 36.9 | 125.1 ± 17.4 | 1.8 ± 0.2 | 2.8 ± 0.5 |
| Mean |
439.8 ± 160.2 |
86.6 ± 21.0 |
101.6 ± 17.2 |
1.5 ± 0.2 |
3.5 ± 0.5 |
| Pinus pinea | |||||
| Site 1 | 342.4 ± 70.2ba | 114.0 ± 30.9 | 97.5 ± 24.9 | 1.6 ± 0.4 | 3.1 ± 0.8 |
| Site 2 | 336.1 ± 34.4bc | 69.4 ± 14.6 | 107.9 ± 72.1 | 1.5 ± 0.5 | 5.4 ± 0.9 |
| Site 3 | 870.2 ± 294.3bd | 132.4 ± 65.2 | 128.1 ± 54.1 | 1.4 ± 0.2 | 2.4 ± 0.3 |
| Mean | 516.2 ± 250.3 | 105.3 ± 26.5 | 111.2 ± 12.7 | 1.5 ± 0.08 | 3.3 ± 1.3 |
Within a column. estimates with a common letter were not significantly different (P = 0.05).
∗
IC50 Trolox in ethanol-water 3.81 μg Trolox/ml; GAE: gallic acid equivalents; CE: catechin equivalents; TEAC: Trolox equivalents antioxidant activity.