MALDI imaging and structural analysis of rat brain lipid negative ions with 9-aminoacridine matrix.

Christopher D Cerruti, Farida Benabdellah, Olivier Laprévote, David Touboul, Alain Brunelle

Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France.

Analytical chemistry 2012 Mar 6

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Mass spectrometry imaging is of growing interest for chemical mapping of lipids at the surface of tissue sections. Many efforts have been devoted to optimize matrix choice and deposition technique for positive ion mode analyses. The identification of lipid species desorbed from tissue sections in the negative mode can be significantly improved by using 9-aminoacridine together with a robust deposition method, yielding a superior signal-to-noise ratio and thus a better contrast for the ion images in comparison to classical matrices such as α-cyano-4-hydroxycinnamic acid, 2,5-dihydroxybenzoic acid, or 2,4,6-trihydroxyacetophenone. Twenty-eight different lipid species (phosphatidic acids, phosphatidylethanolamines, phosphatidylserines, phosphatidylglycerols, phosphatidylinositols, phosphatidylinositol-phosphates, and sulfatides) were scrutinized on rat brain tissue sections, and systematic MS/MS studies were conducted. It was possible to identify isobaric species differing by their fatty acid chains thanks to the improved sensitivity.

Citation

Christopher D Cerruti, Farida Benabdellah, Olivier Laprévote, David Touboul, Alain Brunelle. MALDI imaging and structural analysis of rat brain lipid negative ions with 9-aminoacridine matrix. Analytical chemistry. 2012 Mar 6;84(5):2164-71