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Efficient electrophoretic method to remove neutral additives from protein solutions followed by mass spectrometry
Pei-Jing Pai1, Stephanie M Cologna, William K Russell
1Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.
Analytical Chemistry
|March 15, 2011
Summary
A novel method uses membrane separated wells for isoelectric focusing and trapping (MSWIFT) to rapidly remove neutral additives from protein solutions before mass spectrometry (MS) analysis.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Separation Science
Background:
- Neutral additives are common in protein solutions and can interfere with mass spectrometry (MS) analysis.
- Existing methods for additive removal can be time-consuming or require additional sample preparation steps.
Purpose of the Study:
- To develop a rapid, MS-compatible method for removing neutral additives from protein solutions.
- To demonstrate the efficacy of the membrane separated wells for isoelectric focusing and trapping (MSWIFT) device for this purpose.
Main Methods:
- Utilized electrophoretic migration and trapping in a membrane separated wells for isoelectric focusing and trapping (MSWIFT) device.
- Separated neutral additives (e.g., Triton X-100, Tween 20, PEG) from protein solutions.
- Analyzed samples using mass spectrometry (MS) and ion mobility MS.
Main Results:
- The MSWIFT device effectively removed neutral additives from protein solutions in minutes.
- No further sample cleanup was required prior to MS analysis.
- Coupling MSWIFT with ion mobility MS improved mass spectra quality, even with residual additives.
Conclusions:
- The MSWIFT device offers a fast and efficient method for neutral additive removal from protein samples for MS analysis.
- This technique simplifies sample preparation and enhances MS data quality.
- MSWIFT is a valuable tool for proteomic and other MS-based analyses of protein solutions.
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