Colorimetric Detection of Extracellular Hydrogen Peroxide Using an Integrated Microfluidic Device
Esma Dervisevic1, Nicolas H Voelcker2,3,4, Gail Risbridger5,6,7
1Department of Mechanical and Aerospace Engineering, Monash University, Room 227, New Horizons Building, 20 Research Way, Clayton, Melbourne, Victoria 3800, Australia.
Analytical Chemistry
|January 11, 2022
Summary
A new microfluidic device enables real-time monitoring of extracellular hydrogen peroxide (H2O2) in cell cultures. This innovation overcomes limitations of current methods, allowing for continuous, autonomous analysis with minimal sample volume.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Cell Biology
Background:
- Hydrogen peroxide (H2O2) is a crucial signaling molecule in mammalian cells, regulating processes like cell survival, communication, and cancer metabolism.
- Accurate monitoring of intracellular and extracellular H2O2 concentrations is vital for understanding its physiological roles.
- Existing H2O2 detection methods are often impractical for continuous monitoring due to large sample requirements, high costs, and lengthy analysis times.
Purpose of the Study:
- To develop and demonstrate an integrated microfluidic device for sensitive, real-time colorimetric detection of extracellular hydrogen peroxide (H2O2).
- To overcome the limitations of conventional H2O2 monitoring techniques, enabling inline or online analysis.
- To validate the device's utility by quantifying H2O2 release from cultured cells.
Main Methods:
- Fabrication of an integrated microfluidic device featuring an optical waveguide for absorbance measurement and passive micromixers for efficient reagent mixing.
- Colorimetric detection strategy for quantifying extracellular hydrogen peroxide (H2O2).
- Quantification of H2O2 released from benign prostatic epithelial (BPH-1) cells stimulated with phorbol 12-myristate 13-acetate (PMA).
Main Results:
- The microfluidic device successfully detected H2O2 in the concentration range of 0.5–60 μM.
- Achieved a low detection limit of 167 ± 5.8 nM and a sensitivity of 13.5 ± 0.1 AU/mM.
- Demonstrated proof-of-concept by quantifying PMA-induced H2O2 release from BPH-1 cells using minimal sample volume (<0.4 μL).
Conclusions:
- The developed integrated microfluidic device offers a sensitive and efficient platform for extracellular hydrogen peroxide (H2O2) detection.
- This technology enables autonomous, continuous monitoring of cell-released metabolites without disrupting cell culture conditions.
- The device presents a significant advancement over traditional methods, paving the way for real-time biological process analysis.
