Table 2.
Phosphatase stability and homogeneity. Five different phosphatase batches were tested at different stages of shelf life. Mean, standard deviation (SD) and relative standard deviation (RSDr) were calculated. Three internal control samples were used to verify correct quantification.
| PP2A batch (shelf life) | Sample 1 (µg/kg) | Sample 2 (µg/kg) | Sample 3 (µg/kg) |
|---|---|---|---|
| 1 (2 months) | 95 | 160 | 310 |
| 2 (4 months) | 100 | 169 | 304 |
| 3 (8 months) | 88 | 162 | 323 |
| 4 (10 months) | 94 | 156 | 300 |
| 5 (12 months) | 90 | 144 | 341 |
| mean | 93 | 158 | 316 |
| SD | 5 | 9 | 17 |
| RSDR | 4.8% | 6.0% | 5.2% |