Extraction of oil from high ‐moisture tuna liver by subcritical dimethyl ether: a comparison with different extraction methods

In this study, subcritical dimethyl ether extraction (SDEE) was applied in the extraction of oil from high‐moisture tuna liver. Besides, other different extraction methods including wet reduction (WR), enzymatic extraction (EE), an d supercritical carbon dioxide fluid extraction (SFE‐CO2) were used for comparisons, to assess the effect of different extraction methods on yield, oil quality, flavour (volatile compounds and sensory assessing), vitamin contents and fatty acids composition. Compared with traditional methods, the high ‐quality liver oil could be obtained with excellent yields by SDEE and SFE‐CO2, because they could prevent the oxidation of lipids, and, reduce the damage of PUFAs and vitamins effectively. Besides, only minor differences in volatile compounds and vitamins contents were observed between SDEE ‐oil and SFE‐CO2‐oil, which was attributed to the differences in solubility to the solvents used. The oil with higher contents of vitamin A andα‐vitamin E could be obtained by SDEE. The main limitations of SFE‐CO2 were energy ‐consuming due to high pressure used and the necessary pretreatment of freeze‐drying. However, these drawbacks could be overcome in SDEE because the pressure employed in SDEE was quite low (0.8 MPa) and the freeze‐drying was unnecessary. Therefore, SDEE would be a simple, effective and promi sing technique to obtain the high quality oil rich in n‐3 PUFAs and vitamins in fish oil industry.Practical Applications: Su...
Source: European Journal of Lipid Science and Technology - Category: Lipidology Authors: Tags: Research Article Source Type: research