Processing of cottonseed

Substituted arylimino derivatives of gossypol

“…The newer solvent extraction and screw-press procedures, which are displacing the older hydraulic press method, permit a larger amount of the cottonseed pigments to escape into the oil, and this circumstance, coupled with the extended storage of the crude oil at elevated temperatures, is mainly responsible for color reversion 3 in crude cottonseed oils (4). During the storage of such oils some of the pigments present are converted into forms which are not readily alkali-soluble and are not removed by the conventional refining and bleaching procedures (2).…”

The reduction of free gossypol in cottonseed by pressure cooking

“…The principal pigment of cottonseed is gossypol. This pigment constitutes from 35 to 50% of the weight of the pigment glands and 1 to 2.5% by weight of the kernel is seed of American grown varieties (3,4). The existence of two general forms of gossypol is recognized by the cottonseed industry, free gossypol and bound gossypol.…”

Lipides of Cottonseed

“…Those extracted with petroleum ether, for example, are fairly light in color, whereas oils extracted with dichloroethylene are extremely dark. The evidence from spectrophotometric studies with these oils indicates that a major portion of the pigments present are gossypol, gossypol tautomers, or derivatives of gossypol (1).…”