Table 2.
Antioxidant activities of the volatile extracts of Astragalus species according to the phosphomolybdenum (PM), 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH), 2,2-azino bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), cupric reducing antioxidant capacity (CUPRAC), ferric reducing power (FRAP), and ferrous ion chelating (FIC) assays.
| Samples | PM (mmol TE/g Oil) |
DPPH (mg TE/g Oil) |
ABTS (mg TE/g Oil) |
CUPRAC (mg TE/g Oil) |
FRAP (mg TE/g Oil) |
FIC (mg EDTAE/g Oil) |
|---|---|---|---|---|---|---|
| A. sieversianus | 0.85 ± 0.09 b | 9.11 ± 0.33 d | 51.66 ± 2.42 e | 56.80 ± 0.25 c | 30.65 ± 2.08 c | 36.01 ± 0.46 b |
| A. mucidus | 1.57 ± 0.08 a | 15.95 ± 0.25 c | 91.54 ± 1.97 a | 72.46 ± 2.29 b | 38.11 ± 1.19 b | 18.11 ± 0.22 c |
| A. macronyx | 0.95 ± 0.04 b | 24.12 ± 2.24 a | 82.65 ± 4.94 b | 80.28 ± 2.65 a | 49.02 ± 2.32 a | 38.00 ± 0.88 b |
| A. lehmannianus | 1.31 ± 0.12 a | 21.90 ± 0.76 ab | 69.58 ± 5.04 c | 84.06 ± 0.57 a | 49.47 ± 0.13 a | 4.03 ± 0.41 d |
| A. chiwensis | 0.97 ± 0.17 b | 18.62 ± 1.36 bc | 57.84 ± 0.15 de | 70.73 ± 2.22 b | 39.03 ± 1.63 b | 11.74 ± 0.97 c |
| A. campylotrichus | 0.81 ± 0.07 b | 15.19 ± 1.53 c | 64.61 ± 1.74 cd | 67.78 ± 0.83 b | 39.27 ± 0.75 b | 51.69 ± 5.94 a |
Values expressed as means ± S.D. of three parallel measurements. TE: Trolox equivalent; EDTAE: EDTA equivalent. Superscripts within a column indicate significant differences in Astragalus species (p < 0.05).