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Comparative TOF-SIMS and MALDI TOF-MS analysis on different chromatographic planar substrates
Ivan Talian1, Andrej Orinák, Jan Preisler
1University of P. J. Safárik, Faculty of Sciences, Institute of Chemistry, Kosice, Slovakia. talian@fns.uniba.sk
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) offers superior molecular profiling of abietic and gibberellic acids on nanostructured surfaces compared to matrix-assisted laser desorption/ionisation mass spectrometry (MALDI TOF-MS). TOF-SIMS provides more reliable data on specialized chromatographic layers.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Surface Science
Background:
- High-resolution mass spectrometry is crucial for analyzing complex molecular profiles on various surfaces.
- Surface-based mass spectrometric techniques like TOF-SIMS and MALDI TOF-MS are essential for detailed chemical analysis.
- Chromatographic thin layers serve as platforms for analyte separation and subsequent MS analysis.
Purpose of the Study:
- To compare the efficacy of TOF-SIMS and MALDI TOF-MS for analyzing abietic and gibberellic acids.
- To evaluate the performance of these methods on different chromatographic thin layer materials.
- To explore the potential of integrating high-resolution MS with nanostructured surfaces for advanced detection systems.
Main Methods:
- Utilized time-of-flight secondary ion mass spectrometry (TOF-SIMS) and matrix-assisted laser desorption/ionisation mass spectrometry (MALDI TOF-MS).
- Analyzed abietic and gibberellic acids on silica gel thin layers, monolithic silica gel ultra-thin layers, and Raman spectroscopy-compatible layers.
- Employed ferulic acid and 2,5-dihydroxybenzoic acid as MALDI matrices.
Main Results:
- TOF-SIMS demonstrated superior analytical signal response on monolithic silica gel and SIMS-interfacing modified silica gel surfaces.
- MALDI TOF-MS showed limited success, with intense matrix fragments and poor analyte identification, especially with gibberellic acid.
- The silica gel SIMS-interfacing channel facilitated MALDI MS fragmentation, but TOF-SIMS proved more effective for reliable analyte profiling.
Conclusions:
- TOF-SIMS is a more effective high-resolution MS method for analyzing abietic and gibberellic acids on specialized chromatographic layers.
- Nanostructured surfaces combined with TOF-SIMS offer promising avenues for miniaturized chip and nanoscale detection systems.
- Further research is needed to optimize MALDI TOF-MS for such applications or to focus on TOF-SIMS's integration capabilities.
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