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Table IV.
The scavenging activities of casein hydrolysates and six casein plasteins on DPPH radical and ABTS·+.
| Samples | The decrease of free amino groups (μmol·g−1 proteins) | Scavenging activity on DPPH radicale
|
Scavenging activity on ABTS·+
f
|
||
|---|---|---|---|---|---|
| TEAC (mmol·g−1 proteins) | IC50 (μg·mL−1) | TEAC (μmol·g−1 proteins) | IC50 (μg·mL−1) | ||
| Casein hydrolysatesg | 0 | 10.45 ± 0.64b | 1854.46 ± 109.54 | 8.33 ± 1.14d | 965.52 ± 56.77 |
| Casein plasteins 1 | 7.07 | 76.50 ± 0.30a | 253.29 ± 0.98 | 16.37 ± 1.97a | 491.23 ± 24.58 |
| Casein plasteins 2 | 10.87 | 73.41 ± 1.13a | 263.95 ± 4.02 | 16.17 ± 2.29c | 497.37 ± 52.74 |
| Casein plasteins 3 | 18.43 | 77.47 ± 0.27a | 250.14 ± 0.86 | 16.45 ± 1.21a | 489.05 ± 7.70 |
| Casein plasteins 4 | 78.95 | 86.58 ± 0.57a | 223.81 ± 1.48 | 15.51 ± 0.12b | 518.52 ± 1.60 |
| Casein plasteins 5 | 80.50 | 84.73 ± 2.16a | 228.72 ± 5.91 | 15.09 ± 0.62b | 538.54 ± 9.01 |
| Casein plasteins 6 | 81.01 | 90.31 ± 1.42a | 214.57 ± 3.36 | 15.23 ± 1.09b | 528.30 ± 15.94 |
a–d
Data in the same column with different superscript letters differ significantly (P < 0.05) by Duncan’s multiple range tests.
e
The final concentration of casein hydrolysates or six casein plasteins for the assay of scavenging activity on DPPH radical was 100 μg·mL−1.