Submitted to: Journal of the American Oil Chemists' Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/27/1996
Publication Date: N/A
Interpretive Summary: Soapstock, a by-product of vegetable oil refining, is often acidified to recover the residual fatty acids. The aqueous waste from this recovery process, called acid water, is typically treated as waste water. In this paper, we identify and quantify the remaining organic material in this material. Several potentially valuable phosphate of glycerol and myo-inositol were identified from the acid waters of canola, corn, cottonseed, peanut, soybean, and sunflower.
Technical Abstract: Alkaline extracts (soapstocks) from canola, corn, cottonseed, peanut, soybean, and sunflower oil refining were acidified, and identities and concentrations of the low molecular weight organic components of the resulting acid waters were determined by gas chromatography followed by mass spectroscopy and by high-performance liquid chromatography. The main components of each acid water, in order of decreasing concentration and after omitting the fermentation product lactic acid, were phosphoric acid, alpha -glycerophosphate, and glycerol from canola; myo-inositol, phosphoric acid, alpha -glycerophosphate, and myo-inositol-1-phosphate from corn; glycerol, alpha -glycerophosphate, myo-inositol-1-phosphate, and beta -glycerophosphate from cottonseed; phosphoric acid, glycerol, and myo-inositol from peanut; alpha -glycero-1-myo-inositol, myo -inositol- sphate, alpha -glycerophosphate, and glycerol from soybean; and alpha -glycerophosphate, glycerol, myo -inositol-1-phosphate, eta -glycerophosphate from sunflower.