PCB-based integration of electrochemiluminescence detection for microfluidic systems.

Area of Science:

• Analytical Chemistry
• Microfluidics
• Electrochemistry

Background:

• Integrating electrochemiluminescence (ECL) detection into microfluidic systems presents challenges in miniaturization and sensitivity.
• Printed circuit board (PCB) technology offers a potential platform for fabricating integrated microfluidic devices with electrochemical sensing capabilities.

Purpose of the Study:

• To develop an instrumental platform using PCB technology for electrochemiluminescence (ECL) analysis within microfluidic systems.
• To design, fabricate, and test PCB-based gold electrodes and microfluidic devices for sensitive detection of analytes.

Main Methods:

• Fabrication of PCB gold macro- (10 mm²) and micro- (0.09 mm²) electrodes and two ECL microfluidic devices.
• Luminol-based ECL detection with potential modulation between 0.7 and 0 V vs. Ag/AgCl for luminol oxidation.
• Implementation of synchronous detection techniques to enhance signal recovery in low signal-to-noise ratio (SNR) environments.

Main Results:

• Successful integration of PCB technology with microfluidic systems for ECL analysis.
• Demonstrated on/off ECL responses for luminol oxidation in the presence of hydrogen peroxide (H2O2).
• Achieved detection limits of 50 nM H2O2 for macroelectrodes and 100 nM H2O2 for microelectrodes.

Conclusions:

• The developed PCB-based microfluidic devices provide a robust platform for sensitive ECL detection.
• This instrumental development enables efficient integration of ECL analysis in microfluidic applications.
• The technology shows promise for sensitive quantification of hydrogen peroxide and potentially other analytes.