Related Experiment Videos
An improved method for tracking and reducing the void volume in nano HPLC-MS with micro trapping columns
Goran Mitulović1, Marek Smoluch, Jean-Pierre Chervet
1LC Packings, Abberdaan 114, 1046 AA, Amsterdam, Netherlands.
Analytical and Bioanalytical Chemistry
|July 12, 2003
Summary
This study introduces a sensitive nano liquid chromatography (nano HPLC) system for protein analysis. A column-switching setup allows large sample injection volumes, enhancing proteomic research sensitivity and resolution.
Area of Science:
- Proteomics
- Analytical Chemistry
- Biochemistry
Background:
- Tandem mass spectrometry coupled with High-Performance Liquid Chromatography (HPLC) is the standard in proteomic research.
- Analysis of protein digests requires sensitive and high-resolution techniques.
Purpose of the Study:
- To describe a highly sensitive nano HPLC system for protein digest analysis.
- To address challenges in preconcentration and void volumes for femtomole-level sample handling.
Main Methods:
- Development of a column-switching setup for preconcentration of large sample volumes (up to 250 µL).
- Implementation of a simple test monitoring UV trace and pressure profile to diagnose void volumes.
- Use of protein/peptide-saturated columns as a prerequisite for femtomole sample analysis.
Main Results:
- The column-switching setup enabled injection of large sample volumes without significant sensitivity loss.
- A void volume-free system was achieved by replacing connection tubing.
- Comparable separation results were obtained for tryptic digests of cytochrome C, with column switching maintaining resolution.
Conclusions:
- The described nano HPLC system with column switching is effective for analyzing protein digests.
- This method allows for large sample volume injection in short timeframes without compromising resolution or sensitivity.
- The developed void volume diagnostic test and system optimization are crucial for high-sensitivity proteomic analyses.