Passive micromixer for luminol-peroxide chemiluminescence detection

Area of Science:

• Analytical Chemistry
• Microfluidics
• Chemical Sensing

Background:

• Chemiluminescence detection offers high sensitivity for various analytes.
• Microfluidic devices enable efficient mixing and miniaturized analytical systems.
• Passive micromixers can enhance reaction kinetics without external power sources.

Purpose of the Study:

• To develop and evaluate a microchip with an integrated passive micromixer for luminol-peroxide chemiluminescence detection.
• To assess the micromixer's suitability for chemiluminescence reactions and optimize detection parameters.
• To investigate the potential applications of the microchip in environmental monitoring and medical diagnostics.

Main Methods:

• Fabrication of a microchip featuring staggered herringbone structures for chaotic advection-based mixing.
• Integration of luminol-peroxide chemiluminescence detection within the microchip.
• Utilizing an optical fiber and photon detector for light intensity measurement.
• Systematic variation of flow rates to determine optimal mixing and detection conditions.

Main Results:

• The micromixer effectively facilitated the chemiluminescence reaction.
• A linear correlation was established between chemiluminescence intensity and the concentration of cobalt(II) ions or hydrogen peroxide.
• The location of maximum chemiluminescence intensity was found to be dependent on the flow rate.

Conclusions:

• The developed microchip with an integrated passive micromixer is suitable for sensitive chemiluminescence detection.
• The device shows promise for real-time environmental monitoring of heavy metals and for medical diagnostic applications.