APPLICATION OF NMR SPECTROSCOPY TO ASSESS OXIDATIVE STABILITY OF CANOLA AND SOYBEAN OILS

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<jats:title>ABSTRACT.</jats:title><jats:p>Application of <jats:sup>1</jats:sup>H NMR spectroscopy to monitor oxidation of canola and soybean oils was investigated over a 30‐day period at 65C. Relative changes of aliphatic to olefinic (R<jats:sub>ao</jats:sub>) and aliphatic to diallylmethylene (R<jats:sub>ad</jats:sub>) proton ratios during oxidation of these oils were calculated. A steady increase in R<jats:sub>ao</jats:sub> and R<jats:sub>ad</jats:sub> values was observed over the entire length of the storage period. A highly significant correlation (r = 0.933 – 0.985) existed between the TOTOX value and changes in the R<jats:sub>ao</jats:sub> and R<jats:sub>ad</jats:sub> during oxidation of both oils. Therefore, NMR offers a novel method to assess oxidative stability of vegetable oils such as canola and soybean.</jats:p>

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