Peroxynitrite activity of hemin-functionalized reduced graphene oxide

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Biomedical Engineering

Background:

• Reduced graphene oxide (rGO) interfaces enhance electrochemical sensing capabilities for various analytes.
• Developing functionalized rGO materials is crucial for creating sensitive and selective biosensors.
• Hemin plays a vital role in biochemical and electrocatalytic reactions and can act as a reducing agent for graphene oxide (GO).

Purpose of the Study:

• To report a simple, environmentally friendly method for creating a hemin-functionalized rGO hybrid nanomaterial.
• To demonstrate the material's high sensitivity and selectivity towards peroxynitrite (ONOO(-)) detection.
• To establish the utility of this nanomaterial in developing advanced electrochemical biosensors.

Main Methods:

• A hemin-functionalized rGO hybrid nanomaterial was synthesized by mixing an aqueous solution of graphene oxide (GO) with hemin.
• The mixture was sonicated for 5 hours at room temperature to facilitate the formation of the hybrid material.
• The electrochemical properties of the synthesized material were evaluated for peroxynitrite sensing.

Main Results:

• The hemin-functionalized rGO hybrid nanomaterial exhibited remarkable sensitivity to peroxynitrite (ONOO(-)) in solution.
• The developed peroxynitrite sensor demonstrated a sensitivity of approximately 7.5 ± 1.5 nA mM(-1).
• A low detection limit of 5 ± 1.5 nM for peroxynitrite was achieved.

Conclusions:

• The study successfully presents a facile and eco-friendly method for synthesizing hemin-functionalized rGO.
• The resulting hybrid nanomaterial is highly effective for sensitive and selective peroxynitrite detection.
• This work contributes to the advancement of electrochemical biosensors for analytes like peroxynitrite.