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Related Experiment Video

Updated: Jan 13, 2026

Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
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High speed nanofluidic protein accumulator.

Dapeng Wu1, Andrew J Steckl

  • 1Nanoelectronics Lab, University of Cincinnati, Cincinnati, Ohio 45221-0030, USA.

Lab on a Chip
|June 18, 2009
PubMed
Summary

This study presents a novel microchip for highly efficient protein preconcentration, crucial for detecting low-abundance biomarkers. The developed system achieves significant concentration factors and rates, improving biomarker identification in biofluids.

Area of Science:

  • Biomarker Discovery
  • Analytical Chemistry
  • Microfluidics

Background:

  • Detecting low-abundance protein biomarkers in biofluids is challenging.
  • Efficient preconcentration is essential for biomarker identification.

Purpose of the Study:

  • To develop a high-speed protein accumulator for enhanced biomarker detection.
  • To improve the sensitivity of identifying extremely low concentrations of proteins.

Main Methods:

  • Utilized poly(dimethylsiloxane) microchips with 10 nm polycarbonate nanopore membranes.
  • Employed double-sided injection control for electrokinetic fluid flow.
  • Achieved highly localized protein accumulation at the channel's cross point.

Main Results:

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  • Concentrated fluorescein labeled human serum albumin from pM to microM levels in seconds.
  • Demonstrated accumulation factors of approximately 10^5-10^6.
  • Achieved accumulation rates as high as 5000/sec, a >10x improvement over existing methods.

Conclusions:

  • The microchip-based system offers highly efficient and rapid protein preconcentration.
  • This technology significantly enhances the detection of low-abundance protein biomarkers.
  • The developed method represents a substantial advancement in analytical sensitivity for biofluid analysis.