Electrochemiluminescent immunosensor for prostate specific antigen based upon luminol functionalized platinum...

Area of Science:

• Electrochemistry
• Nanotechnology
• Biomarker Detection

Background:

• Prostate specific antigen (PSA) is a key biomarker for prostate cancer diagnosis.
• Sensitive and selective detection methods are crucial for early diagnosis and monitoring.
• Existing methods may lack sensitivity, selectivity, or cost-effectiveness.

Purpose of the Study:

• To develop a novel label-free electrochemiluminescent (ECL) immunosensor for sensitive and selective PSA determination.
• To utilize luminol-functionalized platinum nanoparticles on graphene sheets (Lu-Pt@GS) as an advanced sensing platform.
• To establish a cost-effective and simple method for clinical biomarker analysis.

Main Methods:

• Fabrication of a sensing platform using luminol functionalized platinum nanoparticles (Pt NPs) loaded on graphene sheets (GS).
• Luminol was used as both an ECL reagent and a reductant for in-situ synthesis of Pt NPs on GS.
• Immobilization of PSA antibodies onto the Pt NPs for specific antigen capture.
• Employing a single-step cycle pulse technique to stabilize ECL signals.

Main Results:

• The developed ECL immunosensor demonstrated high sensitivity and selectivity for PSA detection.
• Achieved a wide linear range from 1 pg/mL to 10 ng/mL for PSA.
• Obtained a low detection limit of 0.3 pg/mL for PSA.
• The Lu-Pt@GS platform enhanced ECL signals and provided active sites for antibody immobilization.

Conclusions:

• The novel label-free ECL immunosensor offers a highly sensitive, selective, and cost-effective method for PSA detection.
• The Lu-Pt@GS platform shows great potential for developing advanced biosensing applications.
• This approach provides a new avenue for detecting other important biomarkers in clinical diagnostics.