A capillary electrophoresis chip with hydrodynamic sample injection for measurements from a continuous sample flow

Area of Science:

• Analytical Chemistry
• Microfluidics
• Electrochemical Sensors

Background:

• Miniaturized analytical systems offer advantages in sample handling and analysis speed.
• Microfluidic devices enable precise control over small fluid volumes.
• Capillary electrophoresis (CE) is a powerful separation technique adaptable to microchip formats.

Purpose of the Study:

• To present a microchip-based capillary electrophoresis (MCE) device for continuous analyte measurement.
• To investigate the reproducibility and performance of the MCE system with amperometric detection.
• To introduce a novel hydrodynamic sample injection method for microfluidic CE.

Main Methods:

• Fabrication of a poly(dimethylsiloxane) (PDMS) microfluidic network using replica molding and microfabrication.
• Integration of an electrochemical detector for analyte quantification.
• Development and application of a hydrodynamic sample injection technique.
• Evaluation of consecutive measurement reproducibility for the PDMS-MCE chip.

Main Results:

• Successful fabrication of an integrated microfluidic CE device.
• Demonstration of continuous sample analysis capabilities.
• Characterization of the device's performance, including reproducibility of consecutive measurements.

Conclusions:

• The developed microchip capillary electrophoresis system demonstrates high functional integration.
• The device is suitable for measuring target analytes from continuous sample flows.
• Miniaturized analysis systems offer significant benefits, as exemplified by this integrated MCE device.