Impedimetric immunosensor using avidin-biotin for antibody immobilization.

Area of Science:

• Electrochemistry
• Biosensors
• Materials Science

Background:

• Development of sensitive and stable impedimetric immunosensors is crucial for early disease detection.
• Polypyrrole films offer a versatile platform for biosensor fabrication due to their electrochemical properties.
• Biotinylation strategies enhance antibody immobilization for improved sensor performance.

Purpose of the Study:

• To evaluate the potential of an electrodeposited biotinylated polypyrrole film as an immobilization matrix for impedimetric immunosensors.
• To develop a reproducible and stable immunosensor using avidin-mediated antibody attachment.
• To characterize the performance of the fabricated immunosensor in terms of sensitivity and stability.

Main Methods:

• Fabrication of a biotinylated polypyrrole film via electropolymerization.
• Immobilization of anti-human IgG antibody using avidin as a coupling reagent.
• Characterization of the immunosensor's impedimetric response to varying antigen concentrations.

Main Results:

• The biotinylated polypyrrole film served as an effective immobilization matrix.
• A highly reproducible and stable impedimetric immunosensor device was successfully fabricated.
• The immunosensor exhibited a linear dynamic range of 10-80 ng/mL for antigen detection.
• A low detection limit of 10 pg/mL was achieved.
• The immunosensor showed minimal response loss after two regeneration cycles.

Conclusions:

• Electrodeposited biotinylated polypyrrole films are promising matrices for impedimetric immunosensor fabrication.
• The avidin-biotin immobilization strategy ensures device stability and reproducibility.
• The developed immunosensor demonstrates excellent sensitivity and reusability, suitable for diagnostic applications.