Ionic (liquid) matrices for matrix-assisted laser desorption/ionization mass spectrometry-applications and
Andreas Tholey1, Elmar Heinzle
1Technische Biochemie, Geb. 1.5, Universität des Saarlandes, 66123 Saarbrücken, Germany. a.tholey@mx.uni-saarland.de
Analytical and Bioanalytical Chemistry
|July 11, 2006
Summary
Ionic (liquid) matrices (ILM) offer a solution to hot spot formation in matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). This review explores ILM properties and applications, enhancing quantitative analysis and imaging.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Materials Science
Background:
- Traditional crystalline matrices in ultraviolet-matrix-assisted laser desorption/ionization mass spectrometry (UV-MALDI MS) often form hot spots, leading to sample inhomogeneity.
- Hot spot formation increases measurement times and hinders quantitative analysis in MALDI MS.
- Ionic (liquid) matrices (ILM) have emerged as a promising alternative to conventional crystalline matrices.
Purpose of the Study:
- To provide a comprehensive overview of ionic (liquid) matrices (ILM) as a novel class of MALDI MS matrices.
- To discuss the characteristic properties of ILM and their impact on mass spectrometric parameters.
- To explore the applications of ILM in various fields, including proteome analysis, small molecule analysis, quantitative measurements, and MALDI imaging.
Main Methods:
- ILM are prepared as equimolar mixtures of conventional MALDI matrix compounds (e.g., DHB, CCA, SA) and organic bases (e.g., pyridine, TBA, DMED).
- The review synthesizes existing literature on the properties and performance of ILM in MALDI MS.
- Evaluation of ILM's influence on sensitivity, resolution, and adduct formation.
Main Results:
- ILM demonstrate unique properties that can overcome the limitations of crystalline matrices, such as reduced hot spot formation.
- ILM influence key mass spectrometric parameters including sensitivity, resolution, and adduct formation.
- Successful applications of ILM have been demonstrated in proteome analysis, small molecule analysis, quantitative MALDI MS, and MALDI imaging.
Conclusions:
- Ionic (liquid) matrices represent a significant advancement in MALDI MS, offering improved sample homogeneity and analytical performance.
- ILM show broad applicability across diverse analytical challenges, including quantitative analysis and imaging.
- Further research into the scopes and limitations of ILM will continue to expand their utility in mass spectrometry.
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