Pressing and supercritical CO2 extraction of Camelina sativa oil

• Optimal conditions for screw pressing of Camelina sativa oil were determined.
• Rosemary extract Oxy.Less CS (0.3%) was the most effective antioxidant.
• New homemade supercritical fluid extraction system has been designed.
• Residual oil in press cake was almost totally extracted by supercritical CO2.

The objective of this study was to evaluate the oil extraction process from Camelina sativa (L.) Crantz seeds by screw pressing followed by extraction with supercritical CO2. In pressing experiments, the response surface methodology (RSM) was conducted in order to study the effects of temperature, frequency and nozzle size on oil recovery and quality parameters. The optimal condition to obtain the highest oil recovery and the best oil quality within the experimental range of the variables studied was at temperature of 52 °C, frequency of 20 Hz and using nozzle of ID 9 mm. The experimental values agreed with those predicted, thus indicating suitability of the used models and the success of RSM in optimizing the pressing conditions of investigated system. The cake resulting from pressing at optimal conditions was extracted with CO2 in a new designed and built a homemade supercritical fluid extraction system. The residual oil in the pressed cake was almost totally extracted by supercritical CO2. The aim of this study was also to investigate the influence of natural antioxidant (rosemary extract Oxy.Less CS, Oxy.Less CLEAR and StabilEnhance OSR, green tea extract, olive leaf extract, pomegranate extract) on the oxidative stability of C. sativa oil. The rosemary extract Oxy.Less CS in concentration of 0.3% was the most effective in protecting the oil from oxidative deterioration.