FRET-Created Traffic Light Immunoassay Based on Polymer Dots for PSA Detection

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Fluorometric lateral flow immunochromatographic strips (ICTS) are advancing rapidly due to new fluorescent materials.
• Developing sensitive and specific diagnostic tools for early disease detection is crucial.

Purpose of the Study:

• To develop a novel fluorometric ICTS using semiconducting polymer dots (Pdots) for rapid and sensitive detection of biomarkers.
• To demonstrate the platform's capability for both qualitative and quantitative analysis, including multiplexed detection.

Main Methods:

• Fabrication of an ICTS utilizing ultrabright Pdots as fluorescent reporters.
• Implementation of Förster Resonance Energy Transfer (FRET) to generate concentration-dependent "traffic light" signals.
• Application of the platform for prostate-specific antigen (PSA) detection in whole blood samples.

Main Results:

• The developed ICTS achieved rapid (10 min) qualitative and quantitative analysis of PSA from a single drop of blood.
• The assay demonstrated excellent specificity and a high detection sensitivity of 0.32 ng/mL for PSA.
• Proof-of-concept experiments confirmed the potential for simultaneous multiplexed detection of cancer biomarkers.

Conclusions:

• The Pdot-based traffic light ICTS represents a significant advancement in point-of-care diagnostics.
• This novel platform offers high sensitivity, specificity, and multiplexing capabilities for cancer biomarker detection.
• The technology paves the way for next-generation diagnostic tools with enhanced performance and versatility.