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| # | Solvent | T (°C) | t (h) | Method |
| E1 | MeOH | 25 | 2 | SPE |
| E2 | MeOH | 65 | 2 | SXE |
| E3 | HCl in MeOH then water | 25 | 3 | SPE |
| E4 | HCl in MeOH then aq. HCl | 25 | 3 | SPE |
| E5 | NaOH in MeOH then water | 25 | 3 | SPE |
| E6 | NaOH in MeOH then aq. HCl | 25 | 3 | SPE |
