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High-speed, high-resolution monolithic capillary LC-MALDI MS using an off-line continuous deposition interface for
Hsuan-shen Chen1, Tomas Rejtar, Viktor Andreev
1Barnett Institute and Department of Chemistry and Chemical Biology, Northeastern University, 341 Mugar, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
Analytical Chemistry
|April 15, 2005
Summary
This study presents a novel interface for coupling fast liquid chromatography (LC) with matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). This method enables high-throughput proteome analysis by preserving separation efficiency and resolving over 2000 components.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Proteomics
Background:
- High-throughput proteome analysis requires efficient coupling of separation techniques with mass spectrometry.
- Traditional methods often suffer from band broadening, reducing separation efficiency.
- Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) is a powerful tool for analyzing biomolecules.
Purpose of the Study:
- To develop and validate an off-line continuous deposition interface for coupling high-speed, high-resolution LC with MALDI MS/MS.
- To assess the interface's ability to preserve chromatographic resolution and enable high-throughput analysis.
- To demonstrate the application of this system for complex mixture analysis.
Main Methods:
- Coupling of poly(styrene-divinylbenzene) monolithic LC with MALDI-TOF/TOF MS.
- Utilizing an off-line continuous deposition interface mixing LC eluent with alpha-cyano-4-hydroxycinnamic acid matrix.
- Deposition under subatmospheric pressure (80 Torr) onto a nitrocellulose-precoated MALDI plate.
- Analysis of deposited serpentine traces using MALDI-TOF/TOF MS and MS/MS.
Main Results:
- The continuous deposition interface achieved uniform serpentine traces with microcrystalline morphology.
- No extracolumn band broadening was observed, preserving the high resolution of fast LC peaks (3-5 s peak width).
- Over 2000 components were resolved in a 10-min LC separation, with 386 unique peptides identified via MS/MS.
Conclusions:
- The developed interface effectively couples high-resolution LC separations to MALDI MS without compromising separation efficiency.
- This method enables high-throughput proteome analysis with a high data sampling rate.
- The system demonstrates significant potential for analyzing complex biological samples.