Abstract
Yellow croaker Larimichthys polyactis muscle oil was extracted using an environmental friendly solvent, supercritical carbon dioxide (SC-<TEX>$CO_2$</TEX>), in a semi-batch flow extraction process. SC-<TEX>$CO_2$</TEX> was applied at temperature <TEX>$35^{\circ}C$</TEX> to <TEX>$45^{\circ}C$</TEX> and <TEX>$150^{\circ}C$</TEX> to <TEX>$250^{\circ}C$</TEX> bar of pressure. The flow rate of <TEX>$CO_2$</TEX> (27.79 g/min) was constant throughout the entire 1.5 h extraction period. The oil extraction yield was influenced by the physical properties of SC-<TEX>$CO_2$</TEX> at different temperatures and pressures. The extracted oil was analyzed by gas chromatography to determine the fatty acid composition. According to our results, the SC-<TEX>$CO_2$</TEX> extracted oil was high in eicosapentaenoic acid and docosahexaenoic acid. In addition, the SC-<TEX>$CO_2$</TEX> extracted oil showed greater stability than n-hexane extracted oil based on the peroxide value and acid value. Thus, the quality of yellow croaker oil obtained by SC-<TEX>$CO_2$</TEX> extraction was slightly higher than that of oil obtained by n-hexane extraction.
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