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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
Published on: November 26, 2013
Ionic matrix for matrix-enhanced surface-assisted laser desorption ionization mass spectrometry imaging
1Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA.
Journal of the American Society for Mass Spectrometry
|September 29, 2009
Summary
Ionic matrices enhance matrix-enhanced surface-assisted laser desorption ionization mass spectrometry imaging (ME-SALDI MSI) sensitivity by reducing analyte redistribution and improving vacuum stability. This novel approach offers improved ionization efficiency for MS imaging applications.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry Imaging
- Surface Science
Background:
- Matrix-enhanced surface-assisted laser desorption ionization mass spectrometry imaging (ME-SALDI MSI) is a sensitive technique for analyzing biological samples.
- Conventional matrix application in MALDI MSI can lead to analyte redistribution and poor vacuum stability, limiting imaging quality and sensitivity.
Purpose of the Study:
- To investigate the use of ionic matrices as an alternative to conventional matrices in ME-SALDI MSI.
- To reduce analyte redistribution during sample preparation and enhance matrix vacuum stability.
- To improve the overall sensitivity and ionization efficiency of MS imaging.
Main Methods:
- Employed ionic matrices (CHCA/ANI - alpha-cyano-4-hydroxycinnamic acid/aniline) as a coating layer for ME-SALDI MSI.
- Deposited the ionic matrix onto tissue samples via sublimation to prevent analyte redistribution.
- Quantitatively compared the vacuum stability of the ionic matrix with conventional matrices.
- Demonstrated improved ionization efficiency using the ionic matrix in ME-SALDI MSI mode.
Main Results:
- The ionic matrix (CHCA/ANI) film was visually homogeneous.
- The ionic matrix exhibited excellent vacuum stability compared to conventional matrices.
- Significantly improved ionization efficiency of analytes was observed.
- The benefits were clearly demonstrated in the MS imaging analysis of garlic tissue sections.
Conclusions:
- Ionic matrices are effective in reducing analyte redistribution and enhancing matrix vacuum stability in ME-SALDI MSI.
- The use of ionic matrices leads to improved ionization efficiency and enhanced MS imaging sensitivity.
- This method shows significant promise for analyzing complex biological samples with improved spatial resolution and sensitivity.
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