engleski

Supercritical CO2 extraction of soybean oil: process optimization and triacylglycerol composition

Supercritical CO2 extraction of soybean oil was performed. Response surface methodology was applied to evaluate the effects of pressure, temperature and extraction time on soybean oil yield. The analysis of variance showed that pressure and extraction time, followed by the quadratic term of pressure and interaction between pressure and time had the significant effect on the oil yield. The maximum extraction yield (6.59 g/100 g soybeans) at constant CO2 flow rate of 1.629 L/min was achieved at 50 °C, 300 bar and 4 h. The experimental values agreed well with those predicted by regression model. One stage diffusion model was successfully applied for modelling the kinetics of soybean oil. The main triacylglycerols of soybean oil were trilinolein, dilinoleoolein, dilinoleopalmitin and linoleooleopalmitin. Soybean oil extracted by supercritical CO2 had higher levels of linoleic and linolenic acids and lower levels of palmitic and stearic acids compared to oil extracted by organic solvent.

supercritical CO2 extraction; soybean oil; response surface methodology; triacylglycerols; modelling

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