Rapid determination of iodine value by ¹H nuclear magnetic resonance spectroscopy

Abstract

Abstract High‐resolution 1 H nuclear magnetic resonance ( 1 H NMR) has been found to be an effective tool for the direct, rapid, and automated determination of the iodine value (IV) of vegetable oils, including hydrogenated oils (IV=45.9–140.2). The total time required to obtain the 1 H NMR data is about 3 min per sample. The IV is calculated from the number of double‐bonded protons and the average molecular weight derived directly from the spectrum. The average of olefinic protons and allylic plus divinyl protons area was used to calculate the absolute number of double‐bonded protons. The 1 H NMR results were compared with those obtained by the traditional Wijs‐cyclohexane methods. The correlation coefficient between traditional IV and the novel 1 H NMR method was r 2 =0.9994 for the regression equation Y =0.9885 X + 2.8084, where X was the result given by the traditional method. With the proposed regression equation, IV calculated by the 1 H NMR method was within an error of ± 1 unit of the result obtained by the traditional method. The proposed method is practically viable if one can afford to have the NMR system.