Processing of cottonseed |
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Authors: | Charlotte H. Boatner Catherine M. Hall Robert T. O'Connor Leah E. Castillon Maizie C. Curet |
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Affiliation: | 1. Southern Regional Research Laboratory, New Orleans, Louisiana
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Abstract: | - The pigmentation of cooked cottonseed has been shown to depend principally upon the moisture content and period of heating of the seed.
- Several samples of crude hydraulic-pressed and screw-pressed oils produced under known processing conditions were found to differ markedly from each other with respect to their original colors and refining characteristics.
- The screw-pressed crude oils were more deeply colored and contained one principal pigment, whereas the hydraulic-pressed oils contained two principal pigments.
- The absence of significant amounts of gossypol in the crude oils has been demonstrated by means of a new technic for the quantitative isolation of gossypol.
- The crude oil pigments differed from gossypol, but like gossypol, they were removed during alkali refining.
- The pigmentation of the crude oils has been shown to depend principally upon the pigmentation of the original seed and the moisture content of the seed during cooking.
- On the basis of their absorption spectra it has been deduced that the alkali-refined hydraulic-pressed oils contain two to three pigments originally present in the crude oils whereas the alkali-refined serewpressed oils contain these same pigments as well as a large number of decomposition products of the principal crude oil pigment.
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