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United States Department of Agriculture

Agricultural Research Service

Title: Compositional Characterization of Cottonseed Soapstocks

Author
item Dowd, Michael

Submitted to: Journal of the American Oil Chemists' Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: July 6, 1996
Publication Date: N/A

Interpretive Summary: Cottonseed soapstocks were characterized by chemical methods and chromatography. Moisture and solvent averaged 48.7% of the sample mass. On a dry basis, the samples averaged 33.3% fatty acids, 26.3% phospholipids, 8.4% triglycerides, and 7.5% gossypol. Several individual components have been identified. The relatively high concentration of gossypol makes cottonseed soapstock the most likely starting material for isolating large quantities of this potentially important compound.

Technical Abstract: Cottonseed soapstocks (39) collected during the 1993-1994 crushing season from oilseed extraction mills throughout the Cotton Belt were analyzed by chemical and chromatographic methods. Volatiles averaged 48.7%. On a dry basis, the samples averaged 33.3% fatty acids, 26.3% phospholipids, 8.4% triglycerides, and 7.5% gossypol. On average, analytical techniques accounted for 93.3% of the dry soapstock matter. Individual free fatty acids, carbohydrates, polyalcohols, sterols, and monoglycerides are quantified. Di- and triglycerides are also reported. The AOCS method for total fatty acids in soapstock yields values in agreement with the chromatographic and phosphorus analyses. In contrast, the AOCS method for neutral oil in soapstock yields values significantly higher than those obtained by chromatography. Correlations exist among several of the measured components.

Last Modified: 8/29/2014
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