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Related Experiment Video

Updated: Dec 8, 2025

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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On-chip protein separation with single-molecule resolution.

Adam Zrehen1, Shilo Ohayon1, Diana Huttner1

  • 1Technion Israel Institute of Technology, Haifa, Israel.

Scientific Reports
|September 18, 2020
PubMed
Summary
This summary is machine-generated.

This study scales sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to single-molecule protein analysis using microfluidics and advanced imaging. This method enables precise separation and identification of individual proteins, crucial for complex biological samples.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Accurate protein identification requires single-protein sensing due to vast expression level variations.
  • Existing methods face challenges with abundant proteins causing sensor overflow.
  • Protein separation by weight is key to improving classification strategies.

Purpose of the Study:

  • To scale sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to the single-molecule level.
  • To develop a microfluidic device for real-time, single-protein separation and imaging.
  • To demonstrate the device's capability in analyzing complex biological samples.

Main Methods:

  • Utilized single-photon sensitive widefield imaging for single-molecule detection.
  • Employed in situ polymerization of polyacrylamide gel electrophoresis (PAGE) within a low-profile (0.6 µm) fluidic channel.
  • Integrated electrokinetic protein movement with restricted Brownian motion for focused imaging.
  • Calibrated the device using labeled recombinant proteins (14-70 kDa).

Main Results:

  • Achieved video-rate monitoring of single-protein migration.
  • Demonstrated an exponential relationship between protein molecular weight and mobility.
  • Successfully separated and imaged thousands of proteins directly from a human cancer cell line.
  • Generated detailed separation kinetics profiles for specific labeled proteins.

Conclusions:

  • The developed microfluidic SDS-PAGE system enables single-molecule protein separation and imaging.
  • This technique offers improved protein classification and analysis of complex biological and clinical samples.
  • Potential for downstream integration with single-protein identification sensors for enhanced analysis.