Multi-Quantum Dots-Embedded Silica-Encapsulated Nanoparticle-Based Lateral Flow Assay for Highly Sensitive Exosome...

Area of Science:

• Biotechnology
• Nanotechnology
• Biomarker Discovery

Background:

• Exosomes are crucial biomarkers for disease diagnosis and prognosis.
• Existing colorimetric lateral-flow assays for exosome detection have high limits of detection.
• There is a need for more sensitive and accurate exosome detection methods.

Purpose of the Study:

• To develop a novel, highly sensitive method for exosome detection.
• To improve upon the limitations of existing lateral-flow assays.
• To enable accurate and rapid quantitative analysis of exosomes.

Main Methods:

• Utilized multi-quantum dots embedded in silica-encapsulated nanoparticles (M-QD-SNs) for enhanced brightness and uniform size.
• Developed a lateral flow immunoassay incorporating M-QD-SNs functionalized with anti-CD63 antibodies.
• Tested the system for the detection of human foreskin fibroblast (HFF) exosomes across various concentrations.

Main Results:

• Achieved a significantly low detection limit of 117.94 exosomes/μL, an 11-fold improvement over previous methods.
• Demonstrated selective detection of exosomes, effectively distinguishing them from non-specific binders like liposomes and serum.
• Validated the quantitative capabilities of the M-QD-SN based lateral flow immunoassay.

Conclusions:

• The M-QD-SN based lateral flow immunoassay offers a highly sensitive and quantitative approach for exosome detection.
• This technology overcomes the limitations of traditional assays, paving the way for improved diagnostic and prognostic tools.
• The method ensures rapid, accurate, and specific exosome analysis, crucial for clinical applications.