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DMF-MALDI: droplet based microfluidic combined to MALDI-TOF for focused peptide detection
Kiarach Mesbah1, Robert Thai2, Sarah Bregant3
1LIONS, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191, Gif sur Yvette Cedex, France.
Scientific Reports
|July 30, 2017
Summary
An automated droplet microfluidic system (DMF) coupled with MALDI-TOF analysis significantly enhances peptide detection sensitivity. This DMF-MALDI approach improves analyte focusing, leading to a 30x stronger signal and attomole-level detection limits for proteomics.
Area of Science:
- Proteomics and Analytical Chemistry
- Microfluidics and Mass Spectrometry
Background:
- Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry is crucial for peptide and protein analysis.
- Achieving high sensitivity and homogeneity in sample preparation for MALDI-TOF can be challenging.
Purpose of the Study:
- To develop and validate an automated droplet microfluidic system (DMF) for generating and depositing nanoliter aqueous droplets for MALDI-TOF analysis.
- To assess the impact of DMF on analyte focusing, sample homogeneity, and signal enhancement in MALDI-TOF MS.
- To evaluate the improved detection sensitivity and protein sequence coverage using the DMF-MALDI approach.
Main Methods:
- Development of an automated droplet microfluidic system for controlled generation of nanoliter droplets in oil.
- Deposition of these droplets onto a stainless steel plate for subsequent MALDI-TOF analysis.
- Analysis of model peptides and protein digests using the combined DMF-MALDI technique.
Main Results:
- The DMF-MALDI combination effectively focuses analytes on the MALDI plate, significantly improving sample homogeneity.
- A 30-fold enhancement in the MALDI-TOF MS signal was observed for a model peptide.
- Detection sensitivity limits were improved down to tens of attomoles, with positive detection from sub-nanomolar peptide solutions.
- Enhanced protein sequence coverage was achieved from low attomole amounts of protein digest.
Conclusions:
- The automated droplet microfluidic system coupled with MALDI-TOF MS (DMF-MALDI) offers a powerful method for peptide and protein analysis.
- This integrated approach significantly enhances sensitivity and homogeneity, making it promising for low-abundance proteomic studies.
- DMF-MALDI represents a key advancement for integrated sample treatment and analysis in the field of proteomics.
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