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A multivariate study of the correlation between tocopherol content and fatty acid composition in vegetable oils

, : A multivariate study of the correlation between tocopherol content and fatty acid composition in vegetable oils. Journal of the American Oil Chemists' Society 74(4): 375-380

The main biochemical function of the tocopherols is believed to be the protection of polyunsaturated fatty acids (PUFA) against peroxidation. A critical question that must be asked in reference to this is whether there is a biochemical link between the tocopherol levels and the degree of unsaturation in vegetable oils, the main source of dietary PUFA and vitamin E. We used a mathematical approach in an effort to highlight some facts that might help address this question. Literature data on the relative composition of fatty acids (16:0, 16:1, 18:0, 18:1, 18:2, and 18:3) and the contents of tocopherols (alpha-, beta-, delta-, and gamma-tocopherol) in 101 oil samples, including 14 different botanical species, were analyzed by principal-component analysis and linear regression. There was a negative correlation between alpha- and gamma-tocopherols (r=0.633, P lt 0.05). Results also showed a positive correlation between linoleic acid (18:2) and alpha-tocopherol (r = 0.549, P lt 0.05) and suggested a positive correlation between linolenic acid (18:3) and gamma-tocopherol.

Accession: 002738877

DOI: 10.1007/s11746-997-0093-1

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