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Comprehensive on-line LC/LC/MS of proteins
G J Opiteck1, K C Lewis, J W Jorgenson
1Department of Chemistry, University of North Carolina at Chapel Hill 27599-3290, USA.
Analytical Chemistry
|April 15, 1997
Summary
A new two-dimensional liquid chromatography (LC) system rapidly separates and analyzes complex protein mixtures. This advanced technique, combining cation-exchange and reversed-phase chromatography, offers fast molecular weight analysis for biomolecules.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Chromatography
Background:
- Protein mixture analysis is crucial in biochemistry.
- Existing methods can be time-consuming and complex.
- Efficient separation and characterization of large biomolecules are needed.
Purpose of the Study:
- To describe a novel two-dimensional liquid chromatography (LC) system.
- To demonstrate rapid separation, desalting, and molecular weight analysis of protein mixtures.
- To validate the system's performance using standards and biological samples.
Main Methods:
- Utilized a two-dimensional LC system coupling cation-exchange chromatography with reversed-phase chromatography (RPLC).
- Employed an eight-port valve with storage loops for automated system control.
- Integrated UV detection and electrospray mass spectrometry for effluent analysis.
Main Results:
- Successfully separated complex protein mixtures in under 2 hours.
- Demonstrated efficient desalting of biomolecules.
- Accurate molecular weight analysis was achieved for standard mixtures and E. coli lysate.
Conclusions:
- The developed 2D-LC system provides a rapid and comprehensive approach for protein mixture analysis.
- This method is effective for analyzing complex biological samples like cell lysates.
- The system offers significant advantages in speed and analytical capability for proteomics research.