Abstract
High resolution carbon-13 nuclear magnetic resonance ( 13 CNMR) can be used for characterization of palm oil and palmkernel oil in determining the iodine value (IV) of the oil. It is only necessary to obtain the quantitative 13 CNMR spectrum of the oil in dilute CDCl3 solution in the region of δ30.0-δ24.7 ppm, which pertains to the methylene carbons along the acyl chain from the β-carbonyl to the ω-4. From the peak areas in the spectrum the average number of double bonds per triacylglycerol molecule and the average molecular weight can be calculated and hence the IV. The IVs of 18 samples of palm and palmkernel oil have been determined by 13 CNMR and by the Official Method of the American Oil Chemists Society. There is good agreement between the two sets of IVs. Conditions for obtaining reliable IVs by this 13 CNMR method are given.
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