Detection of ricin using a carbon nanofiber based biosensor.

Area of Science:

• Biosensor technology
• Nanomaterials science
• Analytical chemistry

Background:

• Ricin detection is crucial for security and diagnostics.
• Existing methods may lack sensitivity or require complex procedures.
• Nanoelectrode arrays offer a platform for sensitive biosensing.

Purpose of the Study:

• To develop and characterize a novel biosensor for ricin detection.
• To utilize antibody and aptamer probes immobilized on a nanoelectrode array (NEA).
• To employ electrochemical impedance spectroscopy for detection event analysis.

Main Methods:

• Fabrication of wafer-scale biosensor chips using integrated circuit manufacturing techniques.
• Immobilization of antibody and aptamer probes onto vertically aligned carbon nanofibers (VACNFs) within the NEA.
• Electrochemical impedance spectroscopy (EIS) to monitor changes in electron transfer resistance upon ricin binding.
• Atomic force microscopy (AFM) for surface morphology and height change evaluation.

Main Results:

• Significant changes in electron transfer resistance were observed upon ricin protein binding to the probes.
• Atomic force microscopy confirmed successful probe immobilization and protein binding through observed height changes on the electrode surface.
• The nanoelectrode array biosensor demonstrated effective ricin detection.

Conclusions:

• The developed NEA biosensor, utilizing antibody and aptamer probes, is effective for sensitive ricin detection.
• The integration of VACNFs and wafer-scale fabrication offers a promising platform for advanced biosensing applications.
• Electrochemical and surface characterization methods validated the biosensor's performance.