Network nanostructured polypyrrole hydrogel/Au composites as enhanced electrochemical biosensing platform

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering
• Electrochemistry

Background:

• Development of sensitive and selective biosensors is crucial for early disease diagnosis.
• Polypyrrole hydrogels offer a versatile platform for biosensor fabrication due to their conductivity and biocompatibility.
• Gold nanoparticles enhance surface area and electron transfer, improving sensor performance.

Purpose of the Study:

• To synthesize a novel network nanocomposite of polypyrrole hydrogel loaded with gold nanoparticles (AuNPs).
• To fabricate a sensitive, label-free amperometric immunosensor for Carcinoembryonic antigen (CEA) detection.
• To evaluate the performance and clinical applicability of the developed immunosensor.

Main Methods:

• Direct synthesis of polypyrrole (PPy) hydrogel by mixing pyrrole monomer and phytic acid.
• Electrodeposition of gold nanoparticles (AuNPs) onto the PPy hydrogel network.
• Fabrication of an amperometric immunosensor using the PPy hydrogel/AuNP nanocomposite for CEA detection.

Main Results:

• The PPy hydrogel/AuNP nanocomposite exhibited a 3D network nanostructure with increased surface area and conductivity.
• The immunosensor demonstrated a wide linear detection range (1 fg mL⁻¹ to 200 ng mL⁻¹) and an ultralow limit of detection (0.16 fg mL⁻¹).
• Detection of CEA in human serum samples showed satisfactory accuracy compared to ELISA, indicating good selectivity and reliability.

Conclusions:

• The developed PPy hydrogel/AuNP nanocomposite is a promising material for fabricating highly sensitive electrochemical immunosensors.
• The label-free amperometric immunosensor for CEA detection exhibits excellent performance characteristics.
• The proposed immunosensor holds significant potential for accurate and reliable clinical diagnosis.