Gas chromatography determination of fatty acid alkyl esters (methyl and ethyl) in the presence of mono., di- and triglycerides
Paulo César Narváez Rincón, Jesús Alfonso Torres, Francisco José Sánchez Castellanos, Luisa Fernanda Ponce de León
Abstract
Determining fatty acid methyl or ethyl esters, in the presence of mono-, di- and tri glycerides, is very important when studying fatty compounds' methanolysis or ethanolysis, as well as for controlling the quality of petrochemical products. This work presents a useful technique for determining fatty acids methyl or ethyl esters by high temperature gas chromastography in the presence of mono-, di- and triglycerides. Samples were silylated with N, O-bis (trimethylsilyl) trifluroacetamide (BSTFA) and then passed throught a 12m HT5 column coated with a phenyl-polysiloxane-carborane film. Standard methyl and ethyl palmitate, methyl and ethyl oleate, DL-palmitin, dipalmitin, tripalmitin and triolein solutions were used for calibrating the technique, using tricaprin as internal standard. Retention times and response factors were also determined. The results were employed in following-up palm oil methanolysis and ethanolysis reactions.
Keywords
methanolysis; ethanolysis; gas chromatrography
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