Dynamic electric field assisted multi-dimensional liquid chromatography of biological samples

Area of Science:

• Analytical Chemistry
• Biochemistry
• Separation Science

Background:

• Complex biological samples necessitate advanced separation techniques for accurate analysis.
• Existing methods often struggle with matrix complexity and require extensive sample preparation.

Purpose of the Study:

• To develop a high-resolution separation platform by hyphenating liquid chromatography (LC) and electric potential gradient electrochromatography.
• To enhance sample cleanup, fractionation, and separation capabilities for complex biological matrices.

Main Methods:

• Utilized a multi-dimensional separation strategy combining size exclusion (SEC) and strong cation exchange (SCX) in the first dimension.
• Employed reversed-phase (RP) chromatography in the second dimension with a dynamic, time-variant electric field and polarity reversal.
• Integrated on-line sample cleanup, fractionation, and separation within a single platform.

Main Results:

• Demonstrated comprehensive on-line sample cleanup, including matrix depletion and analyte enrichment.
• Achieved high-resolution fractionation in the first dimension (LC) and separation in the second dimension (LC).
• Showcased the ability to tune selectivity by manipulating the dynamic electric field and polarity.

Conclusions:

• The hyphenated LC-electrochromatography platform provides a powerful tool for analyzing complex biological samples.
• The dynamic electric field offers novel control over selectivity, improving separation efficiency.
• This approach offers a prospect for advanced analytical strategies in proteomics and metabolomics.