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.
Summary Processing of cottonseed by the hydraulic press method has been carried out at two mills, one located about 100 miles farther
south than the other. The varieties of seed processed and conditions during processing, which included cooking of moistened
seed, were essentially the same at both mills. Seed was also processed at the more southerly mill by the screw press method
for which seed was cooked without added moisture.
The crude hydraulic- and screw-pressed oils produced at the two mills were stored at different temperatures for a total of
ten months, and samples of the oils were periodically refined and bleached. Seed was also stored at the two mills, and was
periodically processed for comparison of the oils produced from stored seed with the stored oils. The absorption spectra of
the crude, refined, and bleached oils were determined.
The rate of increase of bleach color in the oils during storage of the seed and crude oils has been correlated with temperature
of storage and changes in the absorption spectra of the oils.
Presented before the 38th Annual Meeting of the American Oil Chemists' Society, New Orleans, Louisiana, May 20–22, 1947.
One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S.
Department of Agriculture. 相似文献
The morphology of binary and ternary polyolefin blends of polypropylene (PP), ethylene-propylene-diene terpolymer (EPDM) and polyethylene (PE) following processing by injection and compression molding has been examined by optical and scanning electron microscopy. Internal surfaces were generated by low temperature fracture and etching with cyclohexane. In binary blends, droplets of EPDM are elongated in the flow direction within 400μm of the mold surface in injection molding, yielding a skin region which is distinct from an isotropic core containing spherical EPDM inclusions. Spherical droplets of EPDM or PE in binary blends with PP increase in size with increasing compression molding time. In ternary blends, spherical inclusions containing both EPDM and PE are dispersed in PP. With increasing compression molding time, EPDM separates from PE and concentrates at the outer edges of the PE inclusion, effectively isolating PE from the PP matrix. 相似文献
Additive processing technologies are rapidly growing in all fields of application. A large number of scientific publications were investigated in order to provide a comprehensive overview of rapid prototyping methods for polymers and their applications, of currently available materials and research concerning additive processes. The current problems of additive processes are described, together with their potential solutions. Furthermore, this article delivers an insight into possible future trends of additive technologies.
