Multicolumn Nanoflow Liquid Chromatography with Accelerated Offline Gradient Generation for Robust and Sensitive...

Area of Science:

• Proteomics
• Analytical Chemistry
• Biotechnology

Background:

• High sensitivity, robustness, peak capacity, and throughput are crucial for bottom-up proteomics, especially for analyzing small samples like single cells.
• Current methods face limitations in speed and maintenance when applied to complex proteomic analyses.

Purpose of the Study:

• To develop an advanced multicolumn nano liquid chromatography (nanoLC) system with offline gradient generation for enhanced proteomics.
• To improve the efficiency, robustness, and throughput of peptide separations for single-cell proteome analysis.

Main Methods:

• A multicolumn nanoLC system was designed with offline gradient generation using a binary pump supporting multiple analytical columns.
• A single trap column was implemented for reduced maintenance and simplified troubleshooting, interfacing with all analytical columns.
• Selective offline elution from the trap column into a sample loop was employed to protect analytical columns from contaminants.

Main Results:

• The system enables sample analysis as fast as every 20 minutes at 40 nL/min flow rate with near 100% mass spectrometry (MS) utilization.
• Continuous operation for months without column replacement was achieved, significantly enhancing column lifetime and system robustness.
• The system was successfully used to analyze proteomes of single cells from a multiple myeloma cell line treated with lenalidomide.

Conclusions:

• The developed multicolumn nanoLC system offers a highly sensitive, robust, and high-throughput solution for bottom-up proteomics.
• This technology significantly advances the capability to analyze complex proteomes from limited biological samples, such as single cells.
• The system's design facilitates parallel processing and extended operational stability, making it suitable for long-term proteomic studies.