Table 4.
Matrix factor (MF) in % (range) of all analytes in urine.
| Compound name | MF (50 ng/mL) | CV (%) of the IS-normalized MF∗ | |
|---|---|---|---|
| Mephedrone | 94.8 | [82–110] | 8.6 |
| Butylone | 99.1 | [92–109] | 4.9 |
| Pentylone | 94.9 | [90–104] | 3.8 |
| Eutylone | 98.1 | [86–109] | 7.2 |
| Ephylone | 93.5 | [86–101] | 4.5 |
| 4-MEAPP | 95.0 | [90–104] | 4.6 |
| PMA | 87.8 | [82–103] | 8.6 |
| PMMA | 95.5 | [85–103] | 5.5 |
| DCK | 93.3 | [84–103] | 5.1 |
| 2-FDCK | 95.5 | [91–99] | 2.6 |
∗ The CV(%) of the IS-normalized MF calculated from ten different samples of the matrix should not be greater than 15%. CV: coefficient of variation; IS: internal standard; mephedrone: 4-methylmethcathinone; ephylone: N-ethylpentylone; 4-MEAPP: 4-methyl-α-ethylaminopentiophenone; PMA: para-methoxyamphetamine; PMMA: para-methoxymethamphetamine; DCK: deschloroketamine; 2-FDCK: 2-fluorodeschloroketamine.