Abstract
A practical method is described for the unambiguous characterization of all fatty acids in natural mixtures from a single injection into a GC-MS instrument. The fatty acids are separated as the methyl esters on a polar siloxane column which yields resolutions similar to those commonly obtained on polyester columns, but has higher thermal stability. Any leakage of the polar siloxane into the mass spectrometer is further reduced by placing a small amount of a thermally stable methyl siloxane packing at the outlet end of the column which serves as a trap. The glc peaks emerging from such columns yield characteristic mass spectra, including molecular ions, which along with the retention data are adequate for the accurate identification of both saturated and unsaturated fatty acids and dimethyl acetals.
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