Determination of Cis- and Trans-18:1 fatty acid isomers in hydrogenated vegetable oils by high-resolution carbon nuclear magnetic resonance |
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Authors: | Yuko Miyake Kazuhisa Yokomizo |
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Affiliation: | (1) Oils and Vegetable Proteins Laboratories, Food Research and Development Laboratories, Ajinomoto Co., Inc., 7-41 Daikoku-cho, Tsurumi-ku, 230-0053 Yokohama-shi, Japan |
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Abstract: | Carbon nuclear magnetic resonance (13C NMR) methods for determining the composition of cis-/trans- and positional isomers in hydrogenated vegetable oils were developed to reduce analytical time. By selecting appropriate
olefinic carbon peaks and by measuring individual peak areas subsequent to the identification of isomeric peaks on the NMR
spectrum, compositional results of the isomers coincided well with those obtained by conventional gas chromatography (GC).
Therefore, it is highly beneficial to choose the 13C NMR method when analysis time is limited. Though the proposed 13C NMR method is promising, further development is needed. For the time being, combination with the traditional GC method is
still encouraged for precise compositional analysis of cis-/trans- and positional isomers. |
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Keywords: | 13C NMR spectroscopy fatty acid isomers hydrogenated vegetable oils |
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