Abstract
Abstract Substitution of toluene for benzene as part of the titration medium specified in the AOAC method for fat acidity (14.069-14.071) was evaluated by 3 laboratories. Blind duplicate samples of 5 commercially available flours were extracted with petroleum ether. The extracts were evaporated to dryness and dissolved in the titration medium containing equal volumes of 95% alcohol and benzene or toluene. Samples were then titrated with standard KOH to the end point of phenolphthalein. The data obtained showed no difference (P > 0.05) between the 2 solvents with respect to fat acidity means. The range of values for repeatability and reproducibility for both solvents was similar. These data indicate that toluene may replace the more toxic benzene. This change has been adopted as a revision in method 14.069-14.071.
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