Table 2.
Precision and accuracy of ent-phyllanthidine (FV1) and rutin (FV2).
| Marker compound | Nominal concentration (a) | Concentration obtained ± SD (b) | Precision (c) (CV, %) | Accuracy (d) |
|---|---|---|---|---|
| Intraday batch | ||||
| FV1 | 200 | 197.0 ± 3.62 | 1.84 | 98.5 |
| 400 | 395.8 ± 5.70 | 1.44 | 98.9 | |
| 600 | 596.9 ± 7.83 | 1.31 | 99.5 | |
| FV2 | 150 | 147.2 ± 2.37 | 1.61 | 98.1 |
| 300 | 296.5 ± 4.11 | 1.39 | 98.8 | |
| 600 | 597.8 ± 7.43 | 1.24 | 99.6 | |
| Interday batch | ||||
| FV1 | 200 | 196.6 ± 3.65 | 1.85 | 98.3 |
| 400 | 394.8 ± 6.53 | 1.65 | 98.7 | |
| 600 | 591.3 ± 8.15 | 1.37 | 98.5 | |
| FV2 | 150 | 146.1 ± 2.12 | 1.45 | 97.4 |
| 300 | 294.3 ± 5.32 | 1.80 | 98.1 | |
| 600 | 596.1 ± 10.47 | 1.75 | 99.4 | |
a: Concentration in ngband−1; b: Mean from six determinations (n = 6), c: Precision as coefficient of variation (CV, %) = [(standard deviation)/(concentration found)] × 100, d: Accuracy (%) = [(concentration found)/(nominal concentration)] × 100.