Table 3.
Total phenolic contents and antioxidant activities of the ten vegetable extracts.
| Sample | Total Phenolic Contents (mg GAE/g DW) |
Antioxidant Activities (μmol TE/g DW) | ||
|---|---|---|---|---|
| DPPH Radical Scavenging Assay | FRAP Assay |
ORAC Assay |
||
| A. cepa | 3.76 ± 0.07 f | 5.90 ± 0.17 f | 5.10 ± 0.05 i | 15.12 ± 0.46 g |
| A. fistulosum | 5.91 ± 0.11 e | 6.14 ± 0.25 f | 18.32 ± 0.08 g | 223.83 ± 11.46 c |
| A. sativum | 1.23 ± 0.02 i | 1.77 ± 0.01 g | 3.25 ± 0.08 j | 80.14 ± 1.51 f |
| Ci. hystrix | 12.98 ± 0.15 b | 6.14 ± 0.06 f | 38.12 ± 0.43 e | 418.32 ± 0.77 a |
| Co. sativum | 2.68 ± 0.07 h | 9.12 ± 0.14 e | 16.46 ± 0.29 h | 87.46 ± 3.96 f |
| Cy. citratus | 9.49 ± 0.28 d | 6.23 ± 0.51 f | 43.21 ± 1.62 c | 119.91 ± 4.00 e |
| E. foetidum | 4.15 ± 0.08 g | 16.46 ± 0.35 c | 27.39 ± 1.65 f | 199.99 ± 8.64 d |
| P. tetragonolobus | 5.41 ± 0.20 e | 21.58 ± 0.88 b | 40.92 ± 1.38 d | 211.83 ± 3.89 cd |
| Se. pennata | 15.33 ± 0.64 a | 33.06 ± 1.07 a | 62.33 ± 1.97 a | 266.11 ± 9.93 b |
| So. melongena | 10.07 ± 0.21 c | 12.07 ± 0.36 d | 57.15 ± 0.32 b | 415.92 ± 18.78 a |
All data were expressed as mean ± standard deviation (SD) of triplicate experiments (n = 3). Small letters indicate significantly different values of the same assay in different vegetable extracts at p < 0.05 calculated by one-way analysis of variance (ANOVA) and Duncan’s multiple comparison test. GAE: gallic acid equivalent; TE: Trolox equivalent; DW: dry weight; DPPH: 2,2-diphenyl-1-picrylhydrazyl; FRAP: ferric reducing antioxidant power; ORAC: oxygen radical absorbance capacity.