Studies in the Rancidity of Oils and Fats Part VI: The Determination of Both the Total and Labile Peroxide Value

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Abstract
By studying the changes in refractive index, viscosity, absorption in the UV, infra‐red patterns, iodine value, and peroxide values using hydriodic acid side by side with other methods which occur during the autoxidation of the methyl esters of corn oil fatty acids at 40°C, it is shown that Wheeler's method is undependable, while the other methods using potassium iodide give only figures for the labile peroxides (hydroperoxides). The use of hydriodic acid does not react with the normal constituents of fats, while it is possible that it reacts with the conjugated bonds under the conditions of the experiment as shown in text.