High resolution 13C NMR spectroscopy of rendered animal fats: degree of saturation of fatty acid chains and position on glycerol

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Abstract
Summary: This work describes the application of high resolution 13C nuclear magnetic response (NMR) to the study of fatty acid composition in animal fats. It allows both the proportions of saturated, mono‐ and polyunsaturated fatty acid chains and the positional isomerism on glycerol to be determined. Olefinic carbon shifts gave quantitative information on the distribution of saturated, mono‐ and polyunsaturated fatty acid chains in animal fat triglycerides. Carbonyl carbon shifts gave information about the degree of saturation of fatty acid chains and their positions on the glycerol. The NMR values agree with the results from gas chromatographic analysis.