Table 3.
Antioxidant activities and angiotensin-converting enzyme (ACE) inhibitory properties of eggplant leaf protein isolate, protein hydrolysates, chymotrypsin hydrolysate ultrafiltration peptide fractions and glutathione (GSH).
| DPPH Radical Scavenging Activity (EC50, mg/mL) |
Superoxide Radical Scavenging Activity (EC50, mg/mL) |
Hydroxyl Radical Scavenging Activity (EC50, mg/mL) |
Metal Chelation Activity (EC50, mg/mL) |
ACE Inhibition (IC50, mg/mL) |
|
|---|---|---|---|---|---|
| Hydrolysates | |||||
| GSH | 0.237 ± 0.019 c | 0.785 ± 0.008 b | 0.668 ± 0.023 e | 4.961 ± 0.016 a | - |
| ELI | 1.213 ± 0.049 a | 0.976 ± 0.001 a | 4.220 ± 0.010 a | 4.768 ± 0.012 b | 2.775 ± 0.017 e |
| AH | 0.364 ± 0.018 b | 0.906 ± 0.003 a | 3.583 ± 0.021 c | 4.969 ± 0.088 a | 2.580 ± 0.013 d |
| CH | 0.226 ± 0.001 c | 0.945 ± 0.002 a | 3.166 ± 0.009 d | 3.999 ± 0.601 e | 2.110 ± 0.069 b |
| PH | 0.264 ± 0.006 c | 0.958 ± 0.002 a | 4.230 ± 0.030 a | 4.292 ± 0.563 d | 2.382 ± 0.001 c |
| TH | 0.350 ± 0.009 b | 0.959 ± 0.002 a | 3.883 ± 0.031 b | 4.476 ± 0.364 c | 2.106 ± 0.028 e |
| CH Fractions | |||||
| <1 kDa | 0.048 ± 0.019 c | 1.212 ± 0.031 b | 2.650 ± 0.022 b | 1.228 ± 0.041 d | 0.836 ± 0.021 a |
| 1–3 kDa | 0.053 ± 0.002 b | 1.270 ± 0.012 b | 2.639 ± 0.043 b | 1.540 ± 0.293 c | 0.830 ± 0.005 a |
| 3–5 kDa | 0.058 ± 0.001 b | 1.419 ± 0.025 a | 2.657 ± 0.085 b | 2.085 ± 0.223 b | 0.811 ± 0.026 a |
| GSH | 0.237 ± 0.019 a | 0.785 ± 0.008 c | 3.166 ± 0.009 a | 4.961 ± 0.016 a | - |
Values having same superscript within the same coloumn are not signficantly (p > 0.05) different from one another. ELI, eggplant leaf protein isolate; AH, alcalase hydrolysate; CH, chymotrypsin hydrolysate; PH, pepsin hydrolysate; TH, trypsin hydrolysate.