Table 3.
Matrix effect calculated for a blank oral fluid sample spiked with 50 µg L−1 of the studied analytes analysed directly by LC–MS/MS, after a 1:1 dilution with methanol, and after MEPS developed procedure
| Analyte | ME (%) | ||
|---|---|---|---|
| Direct | 1:1 dilution | MEPS | |
| 2C-C | 49.8 | 44.1 | 4.3 |
| DOC | 83.3 | 47.1 | 5.4 |
| 2C-E | 75.7 | 67.4 | 17.7 |
| LSD | 39.1 | 34.6 | 17.3 |
| Mescaline-NBOMe | 70.9 | 40.2 | 22.3 |
| 3,4-DMA-NBOMe | 34.9 | 40.9 | 16.9 |
| DOI | 58.5 | 15.4 | 18.3 |
| 2C-P | 61.6 | 52.8 | 16.5 |
| 25H-NBOMe | 59.6 | 17.3 | 17.2 |
| 25N-NBOMe | 54.1 | 20.5 | 16.2 |
| 25C-NBOH | 59.8 | 16.3 | 9.5 |
| 25-MMA-NBOMe | 52.8 | 22.8 | 20.4 |
| 4-MA-NBOMe | 54.5 | 16.8 | 5.1 |
| 25C-NBF | 46.6 | 9.4 | 4.2 |
| 25B-NBOH | 46.2 | 5.5 | 11.0 |
| 30C-NBOMe | 60.0 | 22.0 | 20.8 |
| 25B-NBF | 34.6 | 5.0 | 13.0 |
| 25D-NBOMe | 51.9 | 15.2 | 18.7 |
| 25C-NBOMe | 51.5 | 18.4 | 15.4 |
| 25 T-NBOMe | 51.9 | 15.0 | 21.9 |
| 25I-NBOH | 37.4 | 12.7 | 15.2 |
| 4EA-NBOMe | 44.2 | 13.1 | 14.2 |
| 25B-NBOMe | 49.0 | 15.4 | 17.8 |
| 25I-NBF | 32.0 | 6.6 | 18.4 |
| 25E-NBOMe | 41.7 | 9.9 | 16.2 |
| 25I-NBOMe | 43.0 | 9.6 | 19.6 |
| 25P-NBOMe | 45.8 | -4.7 | 3.9 |
| 25T4-NBOMe | 33.8 | -6.7 | 10.1 |
| Average | 50.9 | 20.8 | 14.5 |
| Standard deviation | 12.6 | 17.4 | 5.7 |
| Maximum | 83.3 | 67.4 | 22.3 |
| Minimum | 32.0 | − 6.7 | 3.9 |
| Pre-concentration factor | 1.0 | 0.5 | 2.0 |