Selective hydrogenation of soybean oil: IV. Fatty acid isomers formed with copper catalysts |
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Authors: | S Koritala H J Dutton |
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Affiliation: | (1) Northern Regional Research Laboratory, 61604 Peoria, Illinois |
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Abstract: | Two samples of soybean oil hydrogenated with copper-containing catalysts at 170 and 200 C were analyzed for their natural
and isomeric fatty acids. Methyl esters of the hydrogenated oils were separated into saturates, monoenes, dienes and trienes
by countercurrent distribution between acetonitrile and pentane-hexane. Monoenes were further separated intocis- andtrans-isomers on a silver-saturated resin column. Double bond location in these fractions was determined by a microozonolysis-pyrolysis
technique. The diene fraction was separated with an argentation countercurrent distribution method, and linoleate was identified
by infrared, ozonolysis and alkaliisomerization data. The double bonds in thecis-monoenes were located in the 9-position almost exclusively. However, the double bonds in thetrans-monoene were quite scattered with 10- and 11-isomers predominating. About 86% to 92% of the dienes consisted of linoleate
as measured by alkali isomerization. Other isomers identified as minor components includecis,trans andtrans, trans conjugated dienes and dienes whose double bonds are separated by more than one methylene group.
No. Utiliz. Res. Dev. Div., ARS, USDA. |
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