Table 1.
Extraction Methods | Extraction Solvents | Limits | Benefits | Reference |
---|---|---|---|---|
QuEChERS | Organic solvents or mixtures (CH3CN, MeOH, MeOH/CH3CN) |
Modifications of the original procedure, need of an additional enrichment step | Economical, fast, simple, detection of low ppb levels, better reproducibility and accuracy | [5] |
LLE | Mixture of organic solvents (hexane, cyclohexane) with diluted acids or water |
Time consuming, the sample can be absorbed by the glass equipment depending on the matrix and the determined compounds |
Effective, for small-scale preparations | [40] |
SLE | Mixture of organic solvents with diluted acids or water |
Matrix effects | Smaller volumes of solvent | [32,45] |
ASE or PLE | Mixture of organic solvents (MeOH/CH3CN, CH3CN/water) |
Expensive instruments, matrix components excessively coextracted |
Fully automated, faster extraction compared to the conventional ones, minimal solvents, higher extraction efficiency | [22,46] |
SFE | Supercritical fluids (CO2), MeOH, ethanol, acetone | Need for specialized and very expensive equipment, not suitable for routine analysis | Fast technique, small solvent volumes, preconcentration effect, extraction of temperature sensible analytes | [22,45,47] |
MAE | Aqueous solution | Only applicable for thermally stable compounds, costly instruments | Reduced extraction time and extraction solvent | [48] |
VALDS–ME | Mixture of organic solvents dispersive solvent and water | Optimization after control a lot of parameters | Use of low density solvents, simple, fast, effective | [20] |