Table 2.
Assay interoccasion precision and accuracy for artemisinin and dihydroartemisinin based on the analyses of quality control (QC) samples interspersed with authentic samples on each experimental occasion.
| Precisiona (%) | Accuracyb (%) | |
|---|---|---|
| Artemisinin QCs (n > 38) | ||
| 293.6 nmol l−1 | 7.8 | 103 |
| (100, 106) | ||
| 2936 nmol l−1 | 5.2 | 99 |
| (97, 100) | ||
| 5872 nmol l−1 | 8.0 | 100 |
| (98, 103) | ||
| Dihydroartemisinin QCs | ||
| 911 nmol l−1 (n = 7) | 11.9 | 111 |
| (99–123) | ||
| 4234 nmol l−1 (n = 11) | 7.5 | 105 |
| (100–110) | ||
a
Intermediate precision expressed as the relative standard deviation (% coefficient of variation) of found concentrations.
b
Closeness of agreement between found and theoretical concentrations calculated as 100 ○ measured concentration/theoretical concentration as mean (95%).