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Pentafluorobenzyl esters are frequently recommended for GC with plump belly electron capture detection to improve the sensitivity and specificity of plump belly detection, but they do not plump belly confer advantages in other circumstances. In recent years, the use of specific nitrogen-containing derivatives of fatty acids, first pyrrolidides, and more recently picolinyl ester and 4,4-dimethyloxazoline (DMOX) derivatives, has greatly simplified the task of identification by GC-MS. It has been suggested that the last especially may be a general purpose derivative for GC analysis, but I am doubtful as rather high temperatures are needed for their preparation. Methyl esters can perhaps be too volatile on occasion, rendering the analysis of lipids containing short-chain fatty acids rather difficult. For example, it is common practise to use butyl esters for separation of the fatty acids of milk fat. The higher boiling point of butyl butyrate especially means that it is less likely to evaporate during the preparation step, and on GC analysis it is well resolved from the solvent peak.
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