Empirical relationships between iodine value and polyunsaturated fatty acid content in marine oils and lipids

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Abstract
From data obtained in this laboratory two empirical formulas have been developed which correlate polyunsaturated fatty acids indicated by GLC analyses with iodine values of marine oils or their fatty acid methyl esters. These formulas have been applied to data from the literature with good agreement. It is suggested that these formulas function only with fats having the basic composition of marine lipids, which consist principally of saturated, monounsaturated and very highly unsaturated fatty acids. The presence of modest amounts of dienoic and trienoic fatty acids such as are found in freshwater aquatic life and in land animals makes the formulas inapplicable, suggesting their use to distinguish marine fish oils and lipids from other types. The formulas could be particularly useful in technological applications of marine oils where a rapid and approximate knowledge of amount of polyunsaturated fatty acids is desirable.

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