13C nuclear magnetic resonance spectral confirmation of Δ6-and Δ7-trans-18:1 fatty acid methyl ester positional isomers |
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| Authors: | E P Mazzola J B McMahon R E McDonald M P Yurawecz N Sehat M M Mossoba |
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| Affiliation: | (1) Office of Scientific Analysis and Support, Center for Food Safety and Applied Nutrition (CFSAN), Food and Drug Administration (FDA), 20204 Washington, DC;(2) Office of Plant and Dairy Foods and Beverages, National Center for Food Safety and Technology, FDA, 60501 Summit-Argo, Illinois;(3) Office of Food Labeling, CFSAN, FDA, 20204 Washington, DC |
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| Abstract: | Trans octadecenoic acid methyl ester isomers were obtained from a partially hydrognated soybean oil and isolated by silver-ion
high-performance liquid chromatography. Recently, the double-bond positions for nine individual trans octadecenoic acid positional isomers (Δ8 through Δ16) were confirmed by gas chromatography-electron ionization mass spectrometry
after derivatization to 2-alkenyl-4,4-dimethyloxazoline. In this communication, the presence of two additional trans-18:1 fatty acid methyl ester positional isomers (Δ6 and Δ7) in the same mixture is confirmed by 13C nuclear magnetic resonance spectroscopy. The identity of the Δ5-trans-18:1 fatty acid methyl ester positional isomer is inferred.
Summer student researcher. |
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| Keywords: | Carbon-13 nuclear magnetic resonance (NMR) partially hydrogenated soybean oil positional isomers trans-monounsaturated fatty acid |
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