Versatile method for electroosmotic flow measurements in microchip electrophoresis.

Area of Science:

• Analytical Chemistry
• Microfluidics
• Separation Science

Background:

• Electroosmotic flow (EOF) is crucial in microfluidic devices.
• Accurate determination of electroosmotic mobility is essential for device optimization.
• Existing methods for measuring low EOF can be time-consuming and complex.

Purpose of the Study:

• To present a novel and versatile method for determining electroosmotic mobility values.
• To enable accurate EOF measurements in microdevices with varying microchannel designs.
• To provide a simpler and more efficient alternative to conventional methods.

Main Methods:

• The method relies on calculating the difference between apparent and effective mobilities of a reference compound.
• Microchip frontal electrophoresis is employed for mobility determination.
• The procedure utilizes a simple monochannel microchip design.

Main Results:

• The proposed method successfully determines both low and high electroosmotic mobility values.
• It offers a versatile and time-saving procedure compared to current monitoring.
• The method was successfully applied to characterize coating procedures in glass and PDMS microchips.

Conclusions:

• A novel, versatile, and efficient method for electroosmotic mobility determination in microdevices has been developed.
• This technique simplifies EOF analysis and is applicable to various microchannel designs and materials.
• The method provides a valuable tool for microfluidic research and development.