EFFECTS OF EXPANDER PROCESS ON THE PHOSPHOLIPIDS IN SOYBEAN OIL

Crude oils were extracted from soybean flakes and collets by conventio nal and expander processes, respectively. The phospholipids were remov ed by degumming, and the lecithins were produced by using commercial p rocedures. The effects of the expander process on the degumming effici encies were evaluated. The differences in the phosphatide compositions of the oils and the lecithins produced from expander and conventional processes were compared by high performance liquid chromatography. Th e phos phorus content indicated that expander processed oil contained more phosphorus (985 ppm) than the conventional oil (840 ppm). However , the phospholipids in the expander-processed oil were more hydratable than those in the conventional oil. After degumming, the phosphorus c ontent in the expander-processed and conventional oil were reduced by 93.2 and 78.6%, respectively. The expander-processed lecithin containe d 74.3% acetone-insoluble matter (AI), and the conventional lecithin c ontained 65.8%. More phosphatidylcholine was found in the expander-pro cessed lecithin (39.78%, based on AI) than in the conventionally proce ssed lecithin (34.19%). The phosphatidylinositol contents of the expan der-processed lecithin and the conventional lecithin are almost the sa me (19.95 and 19.97%). The phosphatidylethanolamine in the expander-pr ocessed lecithin (12.36%) was lower than that in the conventional leci thin (18.07%).