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Controlling pH-regulated bionanoparticles translocation through nanopores with polyelectrolyte brushes
Li-Hsien Yeh1, Mingkan Zhang, Sang W Joo
1Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan.
Analytical Chemistry
|October 6, 2012
Summary
A new polyelectrolyte-modified nanopore enhances the capture and translocation of soft nanoparticles, improving sensing efficiency for biomolecules and DNA sequencing applications.
Area of Science:
- Nanotechnology
- Biophysics
- Materials Science
Background:
- Solid-state nanopores are used for biomolecule sensing.
- Soft nanoparticles (NPs) pose challenges due to pH-dependent surface charge.
- H+ enrichment near charged nanopores hinders NP translocation.
Purpose of the Study:
- To develop a polyelectrolyte (PE)-modified nanopore system.
- To regulate the electrokinetic translocation of soft nanoparticles.
- To enhance sensing efficiency and resolution for biomolecules.
Main Methods:
- Functionalization of a solid-state nanopore with a PE brush layer.
- Modeling the translocation of soft nanoparticles with pH-regulated zwitterionic layers.
- Analyzing the effects of PE modification on NP capture and translocation dynamics.
Main Results:
- PE-modified nanopores overcome H+ enrichment issues.
- Increased capture rate and capture velocity of soft NPs.
- Reduced translocation velocity leading to enhanced sensing.
Conclusions:
- PE-modified nanopores offer a solution for efficient soft NP translocation.
- The system improves sensing efficiency and resolution for single biomolecule analysis.
- Provides a framework for designing advanced nanopore-based sensing devices.
