Table 3. Precision and accuracy of the determination of cannabinoids in plant material (Intra-day n = 5).
| Analyte | Nominal Concentration (ng/mL) | Measured Concentration (ng/mL) (mean +/- SEM) | Accuracy (%) | RSD (%) |
|---|---|---|---|---|
| THC | ||||
| Intra-day | 0.5 | 0.50 +/- 0.03 | 100.4 | 13.20 |
| 5 | 5.23 +/- 0.07 | 104.5 | 3.42 | |
| 50 | 52.82 +/- 0.67 | 105.6 | 3.08 | |
| 200* | 209.67 +/- 3.83 | 104.8 | 4.47 | |
| CBD | ||||
| Intra-day | 0.5 | 0.52 +/- 0.02 | 103.9 | 11.51 |
| 5 | 5.11 +/- 0.10 | 102.3 | 4.61 | |
| 50 | 50.77 +/- 0.20 | 101.5 | 0.95 | |
| 200* | 216.24 +/- 3.01 | 108.1 | 3.41 | |
| CBDA | ||||
| Intra-day | 0.5 | 0.91 +/- 0.09 | 182.3 | 25.43 |
| 5 | 6.87 +/- 0.15 | 137.4 | 5.38 | |
| 50 | 78.98 +/- 4.35 | 158.0 | 13.50 | |
| 200* | 229.47 +/- 6.90 | 114.7 | 7.38 | |
| THCA-A | ||||
| Intra-day | 0.5 | 0.73 +/- 0.02 | 145.3 | 6.00 |
| 5 | 7.25 +/- 0.35 | 145.0 | 11.98 | |
| 50 | 103.17 +/- 3.79 | 206.3 | 9.00 | |
| 200* | 287.33 +/- 8.50 | 143.7 | 7.24 |
* Quality control samples of 200 ng/mL were diluted 1/10 with extraction solvent before injection.