Journal of the American Oil Chemists' Society

, Volume 75, Issue 1, pp 15–19 | Cite as

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

  • Yuko Miyake
  • Kazuhisa Yokomizo
  • Narihide Matsuzaki
Article

Abstract

High-resolution 1H nuclear magnetic resonance (1H 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 1H 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 1H NMR results were compared with those obtained by the traditional Wijs-cyclohexane methods. The correlation coefficient between traditional IV and the novel 1H NMR method was r2=0.9994 for the regression equation Y=0.9885X + 2.8084, where X was the result given by the traditional method. With the proposed regression equation, IV calculated by the 1H 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.

Key words

1H NMR spectroscopy hydrogenated oil iodine value vegetable oil 

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Copyright information

© AOCS Press 1988

Authors and Affiliations

  • Yuko Miyake
    • 1
  • Kazuhisa Yokomizo
    • 1
  • Narihide Matsuzaki
    • 1
  1. 1.Oils & Vegetable Proteins Laboratories, Food Research & Development LaboratoriesAjinomoto Co., Inc.Yokohama-shiJapan

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