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Integrated microfluidic device for mass spectrometry-based proteomics and its application to biomarker discovery
Marie-Helene Fortier1, Eric Bonneil, Paul Goodley
1Department of Chemistry, Université de Montréal, Montréal, Canada, Caprion Pharmaceuticals, Montréal, Canada, Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, Canada.
Analytical Chemistry
|March 15, 2005
Summary
This study presents a novel microfluidic chip system for enhanced proteomics analysis. The nanoLC-chip-MS system demonstrates high reproducibility and sensitivity for detecting low-abundance peptides in complex biological samples.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Proteomics
Background:
- Microfluidic devices offer miniaturization and integration advantages for complex analytical tasks.
- Traditional liquid chromatography-mass spectrometry (LC-MS) systems can suffer from dead volumes and transfer line issues, impacting performance.
- Proteomics research demands sensitive and reproducible methods for analyzing complex biological samples like plasma.
Purpose of the Study:
- To describe the analytical performance of an integrated microfluidic nanoLC-chip-MS system.
- To evaluate the system's figures of merit, including peak capacity, reproducibility, sensitivity, and dynamic range.
- To assess the impact of integrating two-dimensional chromatography on proteomics analysis of complex samples.
Main Methods:
- Development and characterization of a microfluidic chip with an enrichment column, reversed-phase channel, and nanoelectrospray emitter.
- Interfacing the nanoLC-chip system with ion trap and time-of-flight mass spectrometers.
- Analysis of tryptic digests from albumin- and immunoglobulin-depleted rat plasma samples.
- Evaluation of one-dimensional and two-dimensional (strong cation exchange/C18) nanoLC-chip-MS/MS configurations.
Main Results:
- The nanoLC-chip-MS system demonstrated excellent reproducibility for retention time (RSD < 0.5%) and peak intensity (RSD < 9.1%) across replicate runs.
- The system achieved a detection limit of 1-5 fmol for peptide analysis in plasma samples.
- Two-dimensional chromatography integration increased sample loading and selectivity, leading to a higher number of protein identifications in complex plasma samples.
Conclusions:
- The integrated nanoLC-chip-MS system provides a compact, versatile, and high-performance solution for proteomics applications.
- The system's modular design allows for enhanced analytical capabilities, such as two-dimensional chromatography, improving protein identification in complex matrices.
- This technology holds significant potential for advancing quantitative proteomics and biomarker discovery in biological fluids.