Table 2 Limit of detection (LOD), lower limit of quantification (LLOQ), linearity, and calibration curve
Compound | LOD (ng/mL) | LLOQ (ng/mL) | Calibration range (ng/mL) | r | Slope | y-Intercept |
|---|---|---|---|---|---|---|
EtG | 1.5 | 5 | 5–1000 | 1.000 | 0.0016 ± 0.0001 | 0.0102 ± 0.0007 |
NTX | 0.3 | 1 | 1–100 | 0.994 | 0.0854 ± 0.0083 | − 0.0314 ± 0.0063 |
6βNTX | 0.3 | 5 | 5–1000 | 0.994 | 0.0668 ± 0.0023 | 0.0117 ± 0.0707 |
CDP | 1 | 5 | 5–1000 | 0.998 | 0.0209 ± 0.0007 | − 0.0065 ± 0.0033 |
norCDP | 1.5 | 5 | 5–1000 | 0.999 | 0.0103 ± 0.0005 | − 0.0008 ± 0.0032 |