Thicyanogen Absorption of Linseed Oils. Thicyanogen Absorption of Linoleic and Linolenic Acids and Composition of Linseed Oils

Painter, Edgar Page; Nesbitt, L. L.

doi:10.1021/i560114a015

Cited by 12 publications

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References 17 publications

(25 reference statements)

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“…All of the oils upon which this study is based have been analyzed in this laboratory by the thiocyanometric technique. Constants used in the equations were those determined on purified acids prepared in this laboratory (4). The oils were from several varieties of flaxseed (5) grown at many widely separated locations in the United States and Canada.…”

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confidence: 99%

Some relationships between fat acid composition and the iodine number of linseed oil

Painter¹

1944

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Summary RESULTS of analysis of 148 linseed oil samples are summarized. When the constituent fat acid glycerides are plotted against the iodine number the points fall close to a straight line in the cases of saturated acids, oleic acid and linolenic acid. In the case of linoleic acid, however, the points were so dispersed that no significant relationship to the iodine number was apparent. Correlation coefficients between iodine number and the fat acids were: Linolenic, +.97: oleic, −.94; saturated, −.80; and linoleic. −.27. It is possible to estimate within limits the amount of linolenic, oleic and saturated acids in linseed oil by applying equations where the iodine number is the only variable. In the case of linoleic acid, however, the standard deviation along the regression line is almost equal to the standard deviation from the mean. Real differences in composition which are independent of the iodine number exist, however, because the dispersion of the points along the regression lines is greater than would result from errors of precision in the analyses.

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Some relationships between fat acid composition and the iodine number of linseed oil

Painter¹

1944

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“…Estimates of the fatty acid glycerides present in linseed oil have been revised in recent years. The values from the thiocyanogen value (18,19) and ultraviolet absorption of isomerized acids from linseed oil (17) agree fairly well, and show that the fatty acids from linseed oil of 185 iodine value consist of approximately 8% saturated acids, 25% oleic acid, 18% linoleic acid, and 49% linolenic acid. The high content of linolenic acid in linseed oil now seems to be well established.…”

Section: Composition Of Linseed Oilmentioning

confidence: 65%