Liquid–liquid extraction (also known as solvent extraction) involves the separation of compounds based on their relative solubility in two different immiscible liquids, usually organic phase and water. The most common solvents (either alone or in combination) for the extraction of ADF from food products include water, ethanol, methanol, isopropyl alcohol, ammoniacal ethanol, ethyl acetate, ammonia, cyclohexane and tetra-n-butyl ammonium phosphate (Table 3).