Extraction of fat from different sources like oilseeds, nuts, oil containing fruits, animal fat are different and use different techniques.
- Animal fat is extracted by rendering technique that uses heating (moist/dry) fatty tissue.
- Oil from oilseeds and nuts is extracted by using mechanical expellers (screw press) that can extract 90 – 95 % oil in seed.
- Oil from oil cakes and bran is extracted by solvent extraction using hexane as solvent.
- Oil from flesh of fruits is extracted by using hot water extraction technique where flesh of fruit is macerated in hot water and extracted oil can be recovered by settling or centrifugation method.