Table 4.
Total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activity of methanol extract of green jackfruit flour (MJ), ethyl acetate fractions (EaFr.) and its isolated compounds (caffeic acid and syringic acid).
| Sample | TPC (mg GAE/g) |
TFC (mg QE/g) |
EC50 x,y (μg/mL) | ||
|---|---|---|---|---|---|
| Radical Scavenging Activities | |||||
| DPPH | ABTS | Superoxide | |||
| MJ | 252.07 ± 0.15 b | 601.05 ± 0.24 b | 24.30 ± 0.82 c | 20.80 ± 1.32 c | 44.50 ± 2.40 c |
| EaFr. | 153.75 ± 0.36 a | 365.04 ± 2.00 a | 24.02 ± 1.87 c | 20.01 ± 0.33 c | 44.06 ± 1.78 c |
| Caffeic acid | - | 18.50 ± 0.08 b | 12.44 ± 1.60 b | 30.13 ± 2.05 b | |
| Syringic acid | - | 16.00 ± 0.13 a | 11.40 ± 2.04 a | 28.00 ± 1.19 a | |
| BHA | - | - | 40.25 ± 0.30 d | 31.00 ± 0.55 d | 64.75 ± 0.13 d |
x Values are reported as mean ± SE. Duncan multiple range test shows that means in the same column with different superscript letters a–d are significantly different (p ≤ 0.05). y The effective concentration required to exhibit 50% of antioxidant activity is known as the EC50 value under assay conditions.