Abstract
Crystallization conditions are described which are suitable for obtaining almost quantitative precipitation of tri-saturated glycerides from lard, hydrogenated lard, and tallow. Based on the weight and analysis of the precipitate obtained, a practical method for calculating the amount of tri-saturated glycerides in lard and tallow is proposed. When applied to several hydrogenated lards the method gave constant and reproducible fractions, which contained, in addition to tri-saturated glycerides, considerable amount of “isooleins.” Some uncertainty is attached to the direct application of the method of calculation to these materials because of possible presence of mono-saturated-di-“isooleins.” Several samples of commercial lard examined contained about 2.5% of tri-saturated glycerides whereas a sample of edible tallow contained about 14.0%. The proposed method, when applied to lard, gives results in good agreement with those obtained by the acetone-permanganate oxidation method of Hilditch and Lea. The chief advantage of the crystallization method is that much less time is required for the analysis.
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