A few of the commonly used extraction techniques are liquid–liquid extraction (LLE), solid-phase extraction (SPE), solid-phase micro-extraction (SPME), supercritical fluid extraction (SFE), microwave-assisted extraction (MAE), and accelerated solvent extraction technique. Of these methods, the accelerated solvent extraction technique is the
most suitable for solid and semi-solid samples due the following advantages: lower solvent volumes, an automated procedure for the simultaneous extraction of multiple samples, in-cell neutralization of acidic and basic samples, in-cell drying of wet or moist samples with short sample preparation time, and higher extraction recoveries.
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