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Electrophoretic Separation of Proteins
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Microchip-Based Electrophoretic Separations with a Pressure-Driven Backflow.

Ling Xia1, Debashis Dutta2

  • 1Department of Applied Chemistry, Sun Yat-Sun University, Guangzhou, People's Republic of China.

Methods in Molecular Biology (Clifton, N.J.)
|November 30, 2018
PubMed
Summary
This summary is machine-generated.

Researchers improved capillary electrophoresis separations by using pressure-driven backflow in microchannels. This technique increases separation time, enhancing the analysis of closely related species on microchip devices.

Keywords:
Band broadeningCapillary zone electrophoresisElectroosmosisMicrofluidic pumpPressure-driven backflow

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Capillary zone electrophoresis (CZE) separations benefit from increased electric field strength and separation time.
  • Microfluidic systems with short channels allow high electric fields but limit separation times.
  • Analyzing closely related species requires high resolving power, often challenging in microchip devices.

Purpose of the Study:

  • To enhance separation time in short microchannels using pressure-driven backflow.
  • To enable the analysis of closely related species on microchip devices.
  • To improve the resolving power of microchip-based capillary electrophoresis.

Main Methods:

  • Implementation of steady and/or periodic pressure-driven backflow.
  • On-chip pressure generation via partial blockage of electroosmotic flow at channel junctions.
  • Utilizing microchip devices with short, shallow glass channels (<5 μm).

Main Results:

  • Pressure-driven backflow successfully increased separation time in short microchannels.
  • The strategy led to some additional band broadening.
  • Substantial improvement in resolving power was observed for channels shallower than 5 μm.

Conclusions:

  • Steady/periodic pressure-driven backflow is an effective strategy to enhance separation time and resolving power in microchip capillary electrophoresis.
  • This method facilitates the analysis of challenging, closely related species.
  • The technique is particularly beneficial for microchannels shallower than 5 μm.