Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/11/2004
Publication Date: 5/9/2004
Citation: Wan, P.J., Waggoner, A.E., Dowd, M.K. 2004. Effect of extraction solvents on composition of oil and meal obtained from cottonseed (abstract). American Oil Chemists' Society. p. 123-124.
Technical Abstract: The composition of the crude oil extracted from cottonseed with n-heptane, n-hexane, commercial hexane (mixed isomers), 2-methylpentane, commercial isohexane (mixed isomers), n-pentane, acetone, ethanol, 2-propanol, and supercritical CO2 was determined. Each extraction was conducted on cottonseed flakes near the solvent's boiling point in a Soxlet apparatus. Two extraction times were considered (short, 40 minutes; long, 4 hr). Most solvents recovered good yields of oil: 30.9 - 38.0% for the short extraction and 30.4 - 39.6% for long extraction time. The composition of the extracted oils was examined by silylating the sample followed by capillary gas chromatography. The results showed that the oils extracted by these solvents contained 1.1 - 1.7% free fatty acids, 0.01 - 2.46% carbohydrates (sugar and oligosaccharides), 0.31 - 0.43% sterols, 0.08 - 0.16% monoglycerides, 2.3 - 4.1% diglycerides, 0.01 - 0.04% glycerol, in addition to the triglycerides. Generally speaking, longer extraction time and solvents with greater polarity extracted more FFA. Polar solvents also extracted greater amounts of carbohydrates and diglycerides.