Cottonseed Extraction with Mixtures of Acetone and Hexane

摘要

Cottonseed flakes were extracted with mixtures of n-hexane and acetone,with the concentration of acetone varying between 10 and 75%.Adding small amounts of acetone (<25%) to n-hexane significantly increased the extraction of free and total gossy-pol from cottonseed flakes.Sensory testing detected no difference in the odor of cottonseed meals produced either by extraction with 100% n-hexane or by extraction with a 10:90 (vol/vol) mixture of acetonevtiexane.More than 80% of the free gossypol was removed by the 10:90 mixture of acetone/hexane,whereas pure n-hexane extracted about 47% of the free gossypol from cottonseed flakes.A solvent mixture containing 25% acetone removed nearly 90% of the free gossypol that was removable by extraction with pure acetone;the residual meal had only a minimal increase in odor.In contrast,cottonseed meals produced by extraction with pure acetone had a much higher odor intensity.The composition of the cottonseed crude oil was insignificantly affected by the acetone concentration of the extraction solvent.The results indicate that mixtures of acetone and n-hexane can be used as extraction solvents to produce cottonseed crude oil without the concomitant development of odorous meals.