Laser Desorption Ionization Mass Spectrometry Imaging of Drosophila Brain Using Matrix Sublimation versus Modification with Nanoparticles

Phan, Nhu TN,1981Gothenburg University,Göteborgs universitet,National Center for Imaging Mass Spectrometry,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg (author)

Laser desorption ionization mass spectrometry (LDI-MS) is used to image brain lipids in the fruit fly, Drosophila, a common invertebrate model organism in biological and neurological studies. Three different sample preparation methods, including sublimation with two common organic matrixes for matrix-assisted laser desorption ionization (MALDI) and surface assisted laser desorption ionization (SALDI) using gold nano particles, are examined for sample profiling and imaging the fly brain. Recrystallization with trifluoroacetic acid following matrix deposition in MALDI is shown to increase the incorporation of biomolecules with one matrix, resulting in more efficient ionization, but not for the other matrix. The key finding here is that the mass fragments observed for the fly brain slices with different surface modifications are significantly different. Thus, these approaches can be combined to provide complementary analysis of chemical composition, particularly for the small metabolites, diacylglycerides, phosphatidylcholines, and triacylglycerides, in the fly brain. Furthermore, imaging appears to be beneficial using modification with gold nanoparticles in place of matrix in this application showing its potential for cellular and subcellular imaging. The imaging protocol developed here with both MALDI and SALDI provides the best and most diverse lipid chemical images of the fly brain to date with LDI.

Mohammadi, Amir Saeid,1984Göteborgs universitet,University of Gothenburg(Swepub:cth)saamir (author)
Dowlatshahi Pour, Masoumeh,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)masdow (author)
Ewing, Andrew G,1957Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,National Center for Imaging Mass Spectrometry,Department of Chemistry and Molecular Biology,University of Gothenburg(Swepub:cth)andrewe (author)
Göteborgs universitetNational Center for Imaging Mass Spectrometry (creator_code:org_t)

In:Analytical Chemistry: American Chemical Society (ACS)88:3, s. 1734-17410003-27001520-6882

By the author/editor: Phan, Nhu TN, 19 ...; Mohammadi, Amir ...; Dowlatshahi Pour ...; Ewing, Andrew G, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Analytical Chemi ...

By the university: University of Gothenburg; Chalmers University of Technology

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