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Precision of first-order derivative UV spectra (n = 3).
| Sample | C (μg/mL) | DD (%) | (%) | RSD (%) | Within-Day RSD (%) | Between-Day RSD (%) |
|---|---|---|---|---|---|---|
| COSA-1 | 40.2 | 93.4 | 93.4 | 0.35 | 0.81 | 0.95 |
| COSA-2 | 39.8 | 93.0 | 0.83 | 0.93 | ||
| COSA-3 | 40.5 | 93.8 | 0.82 | 0.90 | ||
| COSB-1 | 38.5 | 92.8 | 92.6 | 0.33 | 0.77 | 0.92 |
| COSB-2 | 38.9 | 92.8 | 0.84 | 0.90 | ||
| COSB-3 | 39.1 | 92.2 | 0.79 | 0.95 |
