Table 11.
Long-term stability storage at −20 °C for 50 days (n = 6).
| Concentration (ng/mL) | 1 day | 50 days | AVE | RE (%) |
|---|---|---|---|---|
| 11.14 | 11.9 | 11.2 | 11.6 | 3.3 |
| 557 | 566.9 | 564.3 | 565.6 | 1.5 |
| 1114 | 1166.0 | 1096.9 | 1131.5 | 1.6 |
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