Table 3.
The antioxidant activities of free and bound phenolic fractions of different buckwheat samples.
| Antioxidant Activities | Status | S1 | S2 | S3 | S4 | S5 | S6 |
|---|---|---|---|---|---|---|---|
| DPPH (μmol TE/g DW) | FP | 44.97 ± 1.86d | 17.55 ± 3.10a | 37.35 ± 3.46c | 114.02 ± 0.36e | 26.69 ± 2.24b | 39.38 ± 1.29 c |
| BP | 4.30 ± 0.51a | 7.68 ± 0.20d | 5.65 ± 0.43b | 5.54 ± 1.16b | 6.46 ± 1.84c | 6.40 ± 0.35c | |
| TP | 49.27 ± 2.37d | 25.23 ± 3.30a | 43.00 ± 3.89c | 119.56 ± 1.52e | 33.15 ± 4.08b | 45.78 ± 1.64c | |
| ABTS+ (μmol TE/g DW) | FP | 119.12 ± 1.32d | 69.19 ± 0.30a | 93.50 ± 1.09c | 175.66 ± 1.57e | 75.80 ± 2.28b | 92.12 ± 1.31c |
| BP | 9.01 ± 0.27a | 11.54 ± 0.20c | 9.75 ± 0.69a | 8.92 ± 0.42a | 7.12 ± 0.44b | 10.62 ± 0.20c | |
| TP | 128.13 ± 1.59c | 80.73 ± 0.50a | 103.5 ± 1.78b | 184.58 ± 1.99d | 82.92 ± 2.72a | 102.74 ± 1.51b | |
| OH• (μmol TE/g DW) | FP | 53.69 ± 0.84c | 56.26 ± 1.29c | 32.92 ± 1.90a | 82.64 ± 1.70d | 36.13 ± 3.16a | 42.02 ± 3.44b |
| BP | 14.17 ± 0.55a | 14.54 ± 0.43a | 13.26 ± 0.50a | 13.23 ± 0.74a | 13.90 ± 0.29a | 13.43 ± 0.71a | |
| TP | 67.86 ± 1.39b | 70.80 ± 1.72b | 46.18 ± 2.40a | 95.87 ± 2.44c | 50.03 ± 3.45a | 56.45 ± 4.15a | |
| FRAP (mM FeS(II) E/g DW) | FP | 43.77 ± 1.48c | 31.70 ± 0.33a | 38.82 ± 0.22b | 84.72 ± 3.29d | 29.58 ± 1.31a | 37.06 ± 1.79b |
| BP | 2.90 ± 0.18a | 4.35 ± 0.31c | 3.41 ± 0.16b | 2.95 ± 0.12a | 2.23 ± 0.14a | 3.84 ± 0.03b | |
| TP | 46.67 ± 1.66b | 36.05 ± 0.64a | 43.23 ± 0.38b | 87.67 ± 3.41c | 31.81 ± 1.45a | 40.90 ± 1.82b |
Different lowercase letters (a–e) mean statistically significant differences following different samples (p < 0.05) at the same status. FP, free phenolic; BP, bound phenolic; TP, total phenolic. N.D. not detected.