| Group | GSH-Px activities | |
| Liver (U/mg pro) | Blood (U/ml) | |
| Control | 1037 ± 110 | 872 ± 69 |
| pSPI (1) | 1088 ± 117 | 895 ± 59 |
| pSPI (2) | 1121 ± 71 | 899 ± 75 |
| pSPI (3) | 1196 ± 98* | 971 ± 85* |
| nSPI | 1154 ± 94* | 954 ± 86* |