Massively parallel and highly quantitative single-particle analysis on interactions between nanoparticles on...

Area of Science:

• Nanotechnology
• Biophysics
• Analytical Chemistry

Background:

• Observing single-nanoparticle reactions is crucial for understanding complex processes but challenging with conventional imaging.
• Existing high-resolution imaging techniques face limitations in analyzing dynamic interactions at the nanoscale.

Purpose of the Study:

• To develop a platform for massively parallel, in situ analysis of nanoparticle interactions at single-particle resolution.
• To enable real-time monitoring and quantification of nanoparticle clustering and dynamic processes.
• To demonstrate the platform's application in sensitive molecular detection assays.

Main Methods:

• Development of a photostable plasmonic nanoparticle-modified supported lipid bilayer (PNP-SLB) platform.
• Real-time monitoring of particle-by-particle PNP clustering via diffusion trajectory analysis.
• Quantification using single-particle-level plasmonic coupling and cluster growth kinetics fitting.

Main Results:

• The PNP-SLB platform allows massively parallel in situ analysis of nanoparticle interactions on a 2D fluidic surface.
• Real-time monitoring and quantification of nanoparticle clustering processes were achieved.
• A DNA detection assay demonstrated high sensitivity (attomolar to femtomolar), dynamic range, and single-base mismatch discrimination.

Conclusions:

• The developed PNP-SLB platform offers a powerful tool for studying dynamic intermolecular and interparticle interactions.
• The platform provides convenient analysis and new insights into nanoscale processes.
• This approach shows significant promise for sensitive molecular detection and diagnostics.