Analysis of the camellia oil by various extraction process

Camellia oil was extracted by four methods (subcritical extraction, supercritical CO₂extraction, ultrasonic and pressing extraction) and the indexes of the oil such as oil extracting rate, sensory and physicochemical properties, nutrient contents and fatty acid composition were studied. The results showed that subcritical and supercritical extraction had higher oil extracting rate which exceeded 96% and the oil had more vitamin E, polyphenols, flavonoids, sterols, chlorophyll and carotenoids etc. The sensory and physicochemical indexes of the subcritical and supercritical oil basically conformed to the requirements of the national first-degree standards which were better than the other two methods, so that the refinery processes could be eliminated.But the subcritical extraction was a high efficiency and high quality extracting technology which had lower machinery pressure and cost than the supercritical CO2extraction.