Electron ionization mass fragmentation of monounsaturated long-chain alpha,omega-dicarboxylic acid trimethylsilyl derivatives.
Résumé
RATIONALE
Long-chain monounsaturated -dicarboxylic acids are important components of the cuticle and suberized cell walls of plants.
Identification and quantification of these compounds, which are widespread in environmental samples, can be challenging.
METHODS
The EI-MS fragmentation pathways of long-chain monounsaturated -dicarboxylic acid TMS derivatives were investigated. These
pathways were deduced by low-energy CID-GC-EI-MS/MS and accurate mass measurement.
RESULTS
Low-energy CID-MS/MS analyses and accurate mass measurement enabled us to elucidate EI-MS fragmentations of long-chain
monounsaturated -dicarboxylic acid TMS derivatives. These fragmentations involves successive losses of neutral molecules of TMSOH
and CO initiated by transfer of allylic hydrogen atom to the ionized ester groups, which are thus totally lacking in EI mass spectra of saturated
homologues.
CONCLUSIONS
EI-MS fragmentations of long-chain monounsaturated -dicarboxylic acids TMS derivatives exhibit specific fragment ions that can be very
useful for the quantification in MRM mode of trace amounts of these compounds in environmental samples.
Domaines
Chimie
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