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- W4288050024 abstract "The goal of this study was to develop a rapid and sensitive method to simultaneously determine the free and esterified fatty acid content of soybean oil (SBO) in the same GC-FID run. Using base catalysis with sodium methoxide in methanol, we were able to selectively derivatize the esterified fatty acids to methyl esters and then separate and measure both the free and esterified fatty acids using a free fatty acid phase (FFAP) column. This method was compared to titration, a traditional method of determining acidity in food fats. Using base catalysis, the esterified fatty acid content of the soybean oil was found to be similar to published values. Interestingly, there were similar proportions of free palmitate, stearate, oleate, linoleate, and linolenate at trace levels in the SBO. To compare the methods, soybean oil was spiked with free linoleate from 0.04% to 5%. Using titration, the standard curves indicated that the free fatty acid content over a series of samples, measured as oleic acid, had a r2 value of 0.999. Standard curves from gas chromatography showed an r2 value of 0.998 of linoleic acid added in the sample. However, the base catalysis GC method was inaccurate below 0.5% added linoleic acid due to incomplete transesterification. Using thin layer chromatography, it was established that there were residual mono- and diglycerides in the sample. This was not the case when potassium hydroxide in methanol was used. Once the detection limit of free fatty acids is established, this method would be valuable for rapid screening of food fats for free fatty acids." @default.
- W4288050024 created "2022-07-27" @default.
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- W4288050024 date "2022-09-29" @default.
- W4288050024 modified "2023-10-18" @default.
- W4288050024 title "Simultaneous Determination of Free and Esterified Fatty Acids of Food Fats Using a Rapid Gas Chromatographic Method" @default.
- W4288050024 doi "https://doi.org/10.21748/ebqf1830" @default.
- W4288050024 hasPublicationYear "2022" @default.
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