| Group | SOD | |
| Liver (U/mg pro) | Blood (U/ml) | |
| Control | 327.7 ± 15.9 | 102.1 ± 8.1 |
| pSPI (1) | 337.6 ± 17.5 | 103.3 ± 6.8 |
| pSPI (2) | 344.9 ± 20.6* | 109.6 ± 8.5* |
| pSPI (3) | 353.5 ± 14.5* | 111.5 ± 7.7* |
| nSPI | 335.3 ± 14.5* | 110.8 ± 9.5* |