Assay | Sample | Concentration, μg/ml | EC 50 | |||||||
---|---|---|---|---|---|---|---|---|---|---|
 | 7.8 | 15.6 | 31.3 | 62.5 | 125 | 250 | 500 | 1000 |  | |
(a) DPPH assay (%) | AA | 45.03 ± 1.74aα | 50.14 ± 3.20aβ | 63.05 ± 6.39aγ | 66.63 ± 1.75bγ | 72.21 ± 2.21bδ | 73.45 ± 2.24bδ | 76.48 ± 2.58bδ | 77.53 ± 2.67bδ | 13.25 |
 | PBE | 13.70 ± 0.27bα | 23.92 ± 1.04cβ | 38.49 ± 2.26bγ | 58.89 ± 3.16cδ | 67.43 ± 1.71cε | 69.93 ± 1.91bε | 73.54 ± 1.85bε | 74.86 ± 1.42bε | 49.33 |
 | CPE | 10.80 ± 0.63cα | 32.10 ± 0.40bβ | 58.98 ± 5.82aγ | 87.07 ± 3.09aδ | 85.01 ± 4.44aδ | 86.81 ± 3.47aδ | 84.52 ± 3.23aδ | 83.28 ± 0.66aδ | 26.10 |
(b) FRAP assay (μM Fe 2+ ) | AA | 416.24 ± 78.22abαβ | 610.43 ± 3.99aγδ | 405.47 ± 42.79bαβ | 454.19 ± 31.55cβ | 336.24 ± 45.33cα | 534.53 ± 29.57bγ | 599.83 ± 100.81bγ | 754.02 ± 72.49aγε | 204.25 |
 | PBE | 398.11 ± 15.95bα | 485.06 ± 39.38bβγ | 483.67 ± 53.55aβγ | 509.22 ± 46.27bγ | 551.44 ± 45.71aγδ | 435.61 ± 57.16cβγ | 793.94 ± 41.84aε | 587.83 ± 4.71bδ | 70.76 |
 | CPE | 478.12 ± 46.06aβ | 567.86 ± 38.07aγ | 390.94 ± 15.23bα | 684.27 ± 18.72aδε | 526.66 ± 42.06aβγ | 620.68 ± 9.07aδ | 638.80 ± 52.31bδ | 729.57 ± 57.20aε | 97.30 |
(c) BCB assay (%) | BHT | 31.01 ± 3.60aα | 46.83 ± 3.18aβ | 59.26 ± 1.46aγ | 78.70 ± 3.16aδ | 91.72 ± 2.51aε | 98.23 ± 6.09aε | 97.17 ± 2.82aε | 99.17 ± 5.48aε | 24.09 |
 | PBE | 3.67 ± 0.27cα | 12.88 ± 2.26bβ | 23.20 ± 7.65bγ | 25.31 ± 6.89cγ | 40.71 ± 8.66cγδ | 48.32 ± 7.73cδ | 49.59 ± 3.51cδ | 63.68 ± 13.15cδ | 302.71 |
 | CPE | 9.65 ± 1.99bβ | 5.15 ± 1.10cα | 5.74 ± 1.48cα | 51.47 ± 5.64bγ | 70.50 ± 0.43bδ | 81.55 ± 1.08bε | 83.44 ± 0.80b£ | 88.08 ± 2.73b€ | 84.67 |