| Method | Solvent | Parameters |
| Pressurised liquid extraction (PLE) | acetone/cyclohexane 2/1 v/v | 2 cycles, 100˚C, 140 bar, 10 min stationary phase |
| Soxhlet extraction (Sox) | acetone/cyclohexane 1/1 v/v (100 ml) | 6 h |
| DIN 10382 (SLE) | 1 x acetone (50 ml, 15 min), 2 x cyclohexane (50 ml, 15 min) | agitation at 300 min−1 |
| Variants of SLE | 1 x acetone (50 ml, 15 min), 1 x cyclohexane (50 ml), 1 x rinse with cyclohexane (50 ml) | length of second step varied between 1, 3, 6, or 16 h, agitation at 300 min−1 |