High-throughput single-particle detections using a dual-height-channel-integrated pore.

Area of Science:

• Biotechnology
• Nanotechnology
• Analytical Chemistry

Background:

• Resistive pulse detection is a method for analyzing particles.
• High-throughput analysis is crucial for many biological applications.
• Current methods face limitations in throughput and particle loss.

Purpose of the Study:

• To demonstrate a proof-of-principle for particle concentration.
• To achieve high-throughput resistive pulse detection of bacteria.
• To develop a microfluidic device for enhanced single-particle analysis.

Main Methods:

• Fabrication of polymeric nanochannels integrated with a micropore.
• Utilizing a water pumping mechanism for aggregation-free, size-selective particle concentration.
• Implementing single-bioparticle detection via ionic current measurements after analyte release.

Main Results:

• Achieved two orders of magnitude enhancement in detection throughput.
• Demonstrated aggregation-free particle concentration with negligible loss.
• Successfully applied hydrodynamic control for particle accumulation.

Conclusions:

• The developed microfluidic device enables high-throughput particle concentration and detection.
• This approach significantly improves detection throughput for bacteria and other bioparticles.
• The device concept holds potential for advancing nanopore and nanochannel-based analyses.