The composition of hydrogenated fats by high-resolution13C nuclear magnetic resonance spectroscopy |
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Authors: | Frank D Gunstone |
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Affiliation: | (1) Chemistry Department, The University, KY16 9ST St. Andrews, Fife, Scotland |
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Abstract: | The high-resolution13C nuclear magnetic resonance spectra of twelve hydrogenated fats have been examined. Each spectrum contains 50–100 signals
and reveals much about the nature of the acyl chains of both double-bond position and configuration. The signals for the ω1,
ω2 and ω3 carbon atoms give information on thecis andtrans isomers of the Δ15, Δ14, Δ13 and Δ12 18:1 esters, respectively. Allylic signals distinguish betweencis andtrans esters, and the proportion of totalcis to totaltrans isomers can be obtained from these. Olefinic signals are the most informative, and most of these have been assigned. This
leads to a semi-quantitative estimate of the various 18:1 isomers present. Assignments are based mainly on information already
in the literature, but some were confirmed after urea fractionation of the acids from a hydrogenated oil in whichcis andtrans monoene acids were separately concentrated. |
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Keywords: | cis/trans spectroscopy double-bond migration hydrogenated fats 13C NMR spectroscopy positional isomers (in hydrogenated fats) urea fractionation |
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