MALDI imaging mass spectrometry of lipids by adding lithium salts to the matrix solution. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Analytical and Bioanalytical Chemistry Année : 2011

MALDI imaging mass spectrometry of lipids by adding lithium salts to the matrix solution.

Résumé

Mass spectrometry imaging of lipids using MALDI-TOF/TOF mass spectrometers is of growing interest for chemical mapping of organic compounds at the surface of tissue sections. Many efforts have been devoted to the best matrix choice and deposition technique. Nevertheless, the identification of lipid species desorbed from tissue sections remains problematic. It is now well-known that protonated, sodium- and potassium-cationized lipids are detected from biological samples, thus complicating the data analysis. A new sample preparation method is proposed, involving the use of lithium salts in the matrix solution in order to simplify the mass spectra with only lithium-cationized molecules instead of a mixture of various cationized species. Five different lithium salts were tested. Among them, lithium trifluoroacetate and lithium iodide merged the different lipid adducts into one single lithium-cationized species. An optimized sample preparation protocol demonstrated that the lithium trifluoroacetate salt slightly increased desorption of phosphatidylcholines. Mass spectrometry images acquired on rat brain tissue sections by adding lithium trifluoroacetate showed the best results in terms of image contrast. Moreover, more structurally relevant fragments were generated by tandem mass spectrometry when analyzing lithium-cationized species.

Domaines

Chimie organique

Dates et versions

hal-00606476 , version 1 (06-07-2011)

Identifiants

Citer

Christopher D Cerruti, David Touboul, Vincent Guérineau, Vanessa W Petit, Olivier Laprévote, et al.. MALDI imaging mass spectrometry of lipids by adding lithium salts to the matrix solution.. Analytical and Bioanalytical Chemistry, 2011, 401 (1), pp.75-87. ⟨10.1007/s00216-011-4814-9⟩. ⟨hal-00606476⟩
17 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More