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Published on: December 4, 2017
Polymerized hemin as an electrocatalytic platform for peroxynitrite's oxidation and detection.
Serban F Peteu1, Tiyash Bose, Mekki Bayachou
1Department of Chemistry, Cleveland State University, Cleveland, OH 44115, United States. sfpeteu@umich.edu
Analytica Chimica Acta
|May 18, 2013
Summary
This study demonstrates hemin-functionalized carbon electrodes as a simple platform for detecting peroxynitrite (ONOO(-)). Optimized electrodes enable real-time quantification of this cytotoxic agent, offering a convenient alternative to complex methods.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Biomedical Sensing
Background:
- Peroxynitrite (ONOO(-)) is a key cytotoxic agent in various pathophysiological conditions.
- Existing detection methods for peroxynitrite are often complex and unsuitable for real-time quantification.
- Electrochemical detection offers a simpler and more convenient approach for peroxynitrite analysis.
Purpose of the Study:
- To investigate the intrinsic electrocatalytic role of hemin in the oxidative detection of peroxynitrite.
- To develop and characterize hemin-functionalized carbon electrodes for peroxynitrite quantification.
- To compare the performance of hemin films with PEDOT-hemin composite materials.
Main Methods:
- Electropolymerization of hemin thin films on carbon electrodes.
- Cyclic voltammetry to characterize electrocatalytic oxidation of peroxynitrite.
- Amperometry for dose-response analysis and quantification.
- pH dependence studies and scan rate effects on catalysis.
Main Results:
- Hemin-functionalized electrodes exhibited catalytic current proportional to peroxynitrite concentration.
- Peak potential shifted positively with increasing peroxynitrite concentration.
- Catalytic efficiency was dependent on scan rate and pH.
- Optimized hemin films provided effective platforms for peroxynitrite detection and quantification.
Conclusions:
- Electropolymerized hemin films on carbon electrodes serve as effective platforms for peroxynitrite detection.
- This method offers a simplified approach for real-time quantification of peroxynitrite.
- Hemin-functionalized electrodes show promise for application in flow systems for peroxynitrite determination.
