Table 5.
Antioxidant activities of Licania tomentosa and L. rigida seed extracts and fractions. The scavenging activities were expressed as 50% scavenging concentration (SC50) for the DPPH assay, and as 50% inhibiting concentration (IC50) for the TBARS assay.
| Samples | DPPH Assay SC50 (µg/mL) | TBARS Assay IC50 (µg/mL) | |
|---|---|---|---|
| Without Iron Stress | With Iron Stress | ||
| LtEE | 27.14 ± 1.96 b | 236.07 ± 23.76 d | 20.71 ± 2.89 b |
| LtMF | 26.30 ± 1.86 b | 105.72 ± 32.53 c | 8.55 ± 3.97 a |
| LtEAF | 248.8 ± 2.95 f | 86.57 ± 15.97 b | 1,163.33 ± 115.1 e |
| LtAF | 42.68 ± 1.22 c | ND | ND |
| LrEE | 174.63 ± 11.40 e | 144.33 ± 20.36 c | 286.57 ± 15.05 d |
| LrMF | 84.70 ± 4.30 d | 445.17 ± 46.80 e | ND |
| LrEAF | 9.15 ± 0.03 a | ND | 244.17 ± 67.15 d |
| LrAF | 38.00 ± 0.883 c | 60.80 ± 8.94 a | 153.13 ± 17.65 c |
| Positive control | |||
| Ascorbic Acid | 10.17 ± 0.74 a | ||
LtEE: L. tomentosa ethanolic extract; LtMF: L. tomentosa methanolic fraction; LtEAF: L. tomentosa ethyl acetate fraction; LtAF: L. tomentosa aqueous fraction; LrEE: L. rigida ethanolic extract; LrMF: L. rigida methanolic fraction; LrEAF: L. rigida ethyl acetate fraction; LrAF: L. rigida aqueous fraction. ND: not determined. a−f Values with different letters at the same column differ significantly (p < 0.05).