Abstract
ABSTRACT Table spreads containing various amounts of butteroil blended with vegetable oils are now commercially available. The butter fat percentages in these blends range from 2–40% according to the label information. This research was designed to determine the efficacy of a gas chromatographic procedure for monitoring the quantity of butteroil in the blend. Methyl esters were formed using potassium methoxylate as a catalyst and a heating interval of 2 min at 65°C in a closed vial under a nitrogen atmosphere. Carbon disulfide was used to extract the fatty acid methyl esters which were then separated by capillary gas chromatography. Retention times, peak areas and relative concentrations were determined by an integrator connected to the chromatograph. Changes in chromatographic patterns were monitored as known weights of butteroil were added to melted margarine. Dodecanoic, tetradecanoic, and pentadecanoic acids increased proportionately as butteroil was added to margarine. Commercial butter‐margarine blends were prepared using the same procedure and the quantity of butteroil present was predicted by regression analysis.
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