| Summary: | Fish oil was extracted from the head of longtail tuna (Thunnus tonggol) using various supercritical carbon dioxide (SC
-C02) technique and Soxhlet method, for comparison of the yield. The extraction were performed at temperature 45 to
65 °C and pressure 20 to 40 MPa, where 65 °C/40 MPa gave the highest yield of 20.6, 35.4 and 34.1 g/ 100 g sample
(dry basis) for the continuous, cosolvent, and pressure swing techniques of SC-C02, respectively. The highest C02
consumption was found in continuous technique (943.5 gN a ed by pressure swing (393.1 g), and co-solvent
technique (258.6 g) respectively at 65 °C and 40 MPa. The solubility of oil in SC-C02 at co-solvent technique in¬
creased from 5.87 to 13.69 g oil/100 g of CO?, at pressure swing technique from 3.37 to 8.67 g oil/100 g of C02, and
at continuous technique was only from 0.88 to 2.18 g oil/100 g of C02with the pressure and temperature from 20 to
40 MPa and 45 to 65 "C, respectively. Thus, the co-solvent method of SC-C02 was regarded as the most effective
method in terms of extracting highest oil yield with least amount of C02 consumption from tuna head wastes.
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