Characterization of the Yellow Croaker Larimichthys polyactis muscle Oil Extracted with Supercritical Carbon Dioxide and an Organic Solvent

摘要

Yellow croaker Larimichthys polyactis muscle oil was extracted using an environmental friendly solvent, supercritical carbon dioxide (SC-CO_2), in a semi-batch flow extraction process. SC-CO_2 was applied at temperature 35°C to 45°C and 150°C to 250°C bar of pressure. The flow rate of CO_2 (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-CO_2 at different temperatures and pressures. The extracted oilwas analyzed by gas chromatography to determine the fatty acid composition. According to our results, the SC-CO_2 extracted oil was high in eicosapentaenoic acid and docosahexaenoic acid. In addition, the SC-CO_2 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-CO_2 extraction was slightly higher than that of oil obtained by n-hexane extraction.