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High-speed free-flow electrophoresis on chip
Chao-Xuan Zhang1, Andreas Manz
1Chemistry Department, Imperial College London, London SW7 2AY U.K.
Analytical Chemistry
|November 1, 2003
Summary
A novel microfluidic device enables rapid, continuous separation using free-flow electrophoresis (FFE). This versatile chip offers efficient separation for on-line monitoring in chemical and biochemical processes.
Area of Science:
- Microfluidics
- Analytical Chemistry
- Biotechnology
Background:
- Free-flow electrophoresis (FFE) is a separation technique.
- Microfluidic devices offer miniaturization and high throughput.
- Efficient separation methods are crucial for real-time process monitoring.
Purpose of the Study:
- To develop a microfluidic device for continuous free-flow electrophoresis (FFE).
- To demonstrate the device's capability for rapid separation of fluorescent reagents and labeled amino acids.
- To assess the feasibility of the FFE chip for on-line monitoring applications.
Main Methods:
- Fabrication of a microfluidic chip using glass and PDMS substrates with micromachined channels.
- Utilizing free-flow electrophoresis for continuous separation of sample mixtures.
- Testing the device with fluorescent reagents and fluorescein-5-isothiocyanate-labeled amino acids in aqueous and binary media.
Main Results:
- Achieved separation of a two-component fluorescent mixture in 75 ms with a sample flow rate of 2 nL/s.
- Demonstrated efficient separation of labeled amino acids in various media.
- Verified scaling laws and predicted FFE performance comparable to capillary electrophoresis chips.
Conclusions:
- The developed microfluidic FFE chip enables rapid, continuous separation with low sample flow rates.
- Its design is versatile and adaptable for various applications.
- The chip is suitable for on-line monitoring in chemical and biochemical production lines.