Effects of Supercritical CO2 on Quantity and Quality of Extracted Oil from Myctophidae Fish and Comparison It with the Wet Pressing as a Commercial Method

Abstract

The aim of this study was investigation the effects of different methods (wet pressing: WP and supercritical fluid extraction: SFE) of oil extraction from lantern fish (Myctophidae) in terms of quantity and quality. Results showed there was no significant difference in oil production rate (p>0.05), but there was a significant difference between detected volatile components (alkanes, aldehydes, amines and acetic acid) (p<0.05). Some of Neutral lipids (Wax Esters (WE), Triacylglycerol (TAG) and Free Fatty Acids (FFA)) showed significant difference (p<0.05) and Cholesterol (CHOL) levels did not show significant differences between treatments (p<0.05). Also, fatty acid profiles showed the level of DHA in SFE treatment was significantly higher than WP (p<0.05). The acidity value (AV) did not show a significant difference (p<0.05). Also, the amount of heavy metals (Mercury (Hg), arsenic (As), cadmium (Cd) and lead (Pb)) in extracted oils by SFE was lower than the other method (p<0.05). Therefore, the results of this study indicate the potential of lantern fish for extraction of fish oil in human consumption and the SFE method for extracting it.