The composition and yield of crude lipids obtained from soybeans by successive solvent extractions

Summary

The composition and yield of the crude lipids obtained from soybeans by successive solvent extractions were determined for two solvents: Skellysolve F (boiling range, 35° to 58° C.) and Skellysolve B (boiling range, 63° to 70° C.). The crude lipids from the first and sixth Skellysolve F extractions showed a variation of 17.5 units in iodine number and of 23.42 per cent in phosphatides. Those from the first and fifth Skellysolve B extractions showed a variation of 10.1 units in iodine number and of 17.33 per cent in phosphatides. With each solvent the series of intermittent extractions removed approximately 97 per cent as much oil as did an analytical quantitative extraction using that same solvent. The variation in percentages of the saturated and unsaturated acids was determined and found to be small. No preferential extraction of any glyceride was found. The Skellysolve B removed about the same amount of unsaponifiable matter, and slightly more than twice the weight of phosphatides, as was extracted by the Skellysolve F.