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Journal Article
Research Support, Non-U.S. Gov't
Structural characterization and profiling of lyso-phospholipids in fresh and in thermally stressed mussels by hydrophilic interaction liquid chromatography-electrospray ionization-Fourier transform mass spectrometry.
Electrophoresis 2016 July
The separation efficiency of hydrophilic interaction liquid chromatography and the high resolution/accuracy of electrospray ionization-Fourier transform MS were successfully applied to the detailed characterization of lyso-phosphatidylcholines (LPCs) and lyso-phosphatidylethanolamines (LPEs) contained in the lipid extracts of Mytilus galloprovincialis (Mediterranean mussel). As a result, 57 LPCs, including regio- and positional isomers, and 45 LPEs, including acyl and plasma(e)nyl species, were identified. Four lyso-phosphonocholines were also identified among mussel Lyso-Phospholipids. To the best of our knowledge this represents the first characterization, at a molecular level, ever reported for LPEs in mussels. No significant variation was observed in the composition of both LPCs and LPEs when mussels were refrigerated at +4°C for up to 48 h, i.e. under conditions usually employed for seafood transportation and storage. Treatments mimicking more severe thermal stresses, namely eight day-refrigeration at + 4°C, two week-freezing at -15°C and 6 h-storage at 25°C, resulted in a significant increase in the molar abundance of LPCs and LPEs (expressed with respect to that of their precursors, PCs and PEs, respectively) and was accompanied by the death of all or part of the molluscs. These results were interpreted invoking the generation of lyso-phospholipids, mediated by endogenous phospholipases, as an intermediate process toward the partial replacement of side chains in phospholipids, perhaps functional to a better adaptation of mussels to adverse temperature conditions. Interestingly, the relative abundances of specific compounds belonging to the LPC and LPE classes were found to follow the seasonal variations of sea temperature.
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