Fast atom bombardment and tandem mass spectrometry for determing iso- and anteiso-fatty acids |
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Authors: | Nancy J. Jensen Michael L. Gross |
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Affiliation: | (1) Midwest Center for Mass Spectrometry, Department of Chemistry, University of Nebraska, 68588 Lincoln, NE |
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Abstract: | Branched fatty acids can be distinguished from isomeric straight chain fatty acids by collisionally activating the (M-H)− ions desorbed by using fast atom bombardment (FAB) mass spectrometry (MS). In particular, an acid with iso- fatty branching can be readily distinguished from one containing anteiso- branching; the latter undergoes loss of the elements of CH4 and C2H6 but not C3H8. These decompositions are another example of remote charge site fragmentation. Mixtures of homologs and isomers can be investigated by using the combination of FAB and tandem mass spectrometry (MS-MS). |
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