Comparison of a supercritical fluid extraction method for the extraction of oilseeds with the DGF standard method B-I 5 (87)

Three different oilseeds, rapeseed, sunflower, and soybeans are extracted b y SFE (supercritical fluid extraction). As parameter for the extraction con ditions the extracts are analyzed regarding the contents of tocopherols, an d as parameter for the content of more polar lipids the contents of diglyce rides and free fatty acids are analyzed. The extraction temperature has a significant influence on the determined oi l content, the content of tocopherols, diglycerides, and free fatty acids. With increasing temperature the oil content increases. The content of tocop herols. diglycerides, and free fatty acids increases up to 75 degrees C. At 100 degrees C the content of diglycerides and free fatty acids decreases a nd the content of tocopherols shows no appreciable changes. The optimal ext raction conditions are described and the results of the determination of th e oil content under optimal conditions are compared with the results of the DGF standard method B-I 5 (87). The oil contents investigated with both me thods correspond well. The content of tocopherols is significantly higher in the oil of rapeseed a nd soybeans extracted by SW, whereas the content of diglycerides and free f atty acids varied in dependence on the oilseed.