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Solid phase extraction method
| Step | Solvent | Volume |
|---|---|---|
| composition (v/v/v) | (mL) | |
| Conditioning | MTBE/chloroform/acetic acid (98/2/0.2) | 7.5 |
| Sample loading | MTBE/chloroform/acetic acid (98/2/0.2) | 1.0 |
| Wash I | MTBE/chloroform/acetic acid (98/2/0.2) | 7.5 |
| Wash II | MTBE | 5.0 |
| NAPE elution | MTBE/chloroform/methanol (50/20/30) | 9.0 |
