Continuous Molecular Concentration and Separation Using Pulsed-Field Conductive-Wall Single-Buffer Teı́chophoresis.

Area of Science:

• Electrokinetics
• Separation Science
• Analytical Chemistry

Background:

• Isotachophoresis (ITP) is an electrokinetic technique for focusing charged species.
• ITP requires a low-mobility terminating electrolyte (TE) and a high-mobility leading electrolyte (LE).
• Conventional ITP is often batch-driven and requires specific electrolyte configurations.

Purpose of the Study:

• To present and experimentally study teichophoresis (TPE), a novel continuous electrokinetic molecular concentration and separation technique.
• To demonstrate TPE as a potential alternative to isotachophoresis (ITP).
• To investigate the performance of TPE under varying experimental conditions.

Main Methods:

• Developed a continuous free-flow wall TPE (FFTPE) system.
• Replaced the leading electrolyte (LE) of ITP with a no-flux boundary generated by a conductive wall.
• Performed concentration and separation experiments with varying electric potentials, flow rates, and TE concentrations.

Main Results:

• Demonstrated that TPE can focus charged species using a no-flux boundary instead of an LE.
• Achieved a continuous 60,000-fold concentration factor using only 10 V DC.
• Showcased TPE's potential for high throughput and simplified operation compared to batch ITP.

Conclusions:

• Teichophoresis (TPE) is a viable continuous electrokinetic technique for molecular concentration and separation.
• FFTPE offers advantages over ITP, including simplified setup, lower voltage requirements, and no need for a leading electrolyte.
• TPE presents a promising, efficient method for analytical and preparative separations.