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Low aspect ratio micropores for single-particle and single-cell analysis
Gaurav Goyal1, Rafael Mulero2, Jamel Ali2
1School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA, USA.
Electrophoresis
|March 11, 2015
Summary
Low aspect ratio solid-state micropores enable high-resolution analysis of microparticles and bacteria. These pores distinguish analytes by their unique translocation signatures, aiding in characterization and single-cell analysis.
Area of Science:
- Nanotechnology
- Biophysics
- Materials Science
Background:
- Solid-state nanopores are crucial for single-molecule analysis.
- Low aspect ratio pores offer unique advantages for analyte characterization.
Purpose of the Study:
- To investigate microparticle and bacterial translocation through low aspect ratio solid-state micropores.
- To assess the potential of these micropores for high-resolution analyte characterization and single-cell analysis.
Main Methods:
- Fabrication of 5 μm diameter, 200 nm thick silicon nitride micropores with a low aspect ratio (0.04).
- Microparticle translocation experiments using sulfonated polystyrene microparticles and magnetic microbeads (1-4 μm).
- Bacterial translocation experiments with Escherichia coli and Salmonella typhimurium.
Main Results:
- Microparticle translocation primarily altered geometrical pore resistance, not access resistance.
- Concatenated magnetic microspheres yielded distinct current drop peaks for each bead.
- Distinct current signatures were observed for different bacterial species, linked to surface protein distribution.
Conclusions:
- Low aspect ratio micropores effectively characterize microparticles and bacteria based on translocation behavior.
- These findings support the development of advanced sensors for high-resolution microparticle and single-cell analysis.
