Electrochemical immunosensor for prostate-specific antigen using self-assembled oligophenylethynylenethiol monolayer...

Area of Science:

• Electrochemistry
• Biosensors
• Nanotechnology

Background:

• Prostate-specific antigen (PSA) is a key biomarker for prostate cancer.
• Sensitive and reliable detection of PSA is crucial for early diagnosis and monitoring.
• Existing detection methods may require improvements in sensitivity and efficiency.

Purpose of the Study:

• To develop a novel electrochemical immunosensor for sensitive PSA detection.
• To enhance the electrochemical activity and performance of the immunosensor.
• To investigate the properties and morphology of the fabricated sensor.

Main Methods:

• Fabrication of a self-assembled monolayer (SAM) using 4-(2-(4-(acetylthio)phenyl)ethynyl)benzoic acid (APBA) as a bioreceptor.
• Immobilization of poly(amidoamine) dendrimer onto the APBA SAM to enhance electrochemical activity.
• Characterization of SAM formation and electrical properties using surface plasmon resonance (SPR) and cyclic voltammetry (CV).
• Analysis of the surface morphology of the PSA sandwich complex using atomic force microscopy (AFM).

Main Results:

• Successful fabrication of an electrochemical immunosensor with APBA and poly(amidoamine) dendrimer.
• Demonstrated enhancement in electrochemical activity for PSA detection.
• Characterization confirmed the formation and electrical properties of the SAMs.
• AFM analysis visualized the PSA sandwich complex on the sensor surface.

Conclusions:

• The developed electrochemical immunosensor shows promise for sensitive and efficient PSA detection.
• The integration of APBA SAM and poly(amidoamine) dendrimer significantly enhances sensor performance.
• This approach provides a valuable tool for prostate cancer biomarker detection.