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Cyclic swelling enabled, electrically conductive 3D porous structures for microfluidic urinalysis devices.

Mengtian Yin1, Wanqing Xie2, Li Xiao2

  • 1Department of Mechanical and Aerospace Engineering, University of Virginia, PO Box 400746, 122 Engineer's Way, Charlottesville, VA 22904, USA.

Extreme Mechanics Letters
|May 4, 2023
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Summary

This study introduces a reusable microfluidic device for rapid, quantitative urinalysis using electrical signals. The novel device, featuring carbon nanotube-decorated scaffolds, accurately detects biomarkers like red blood cells and E. coli.

Keywords:
Electrical sensingMicrofluidic devicesSoft porous scaffoldSwellingUrinalyses

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Area of Science:

  • Bioelectronics
  • Microfluidics
  • Nanomaterials Science

Background:

  • Urinalysis is crucial for health monitoring but quantitative analysis is lab-bound.
  • Existing methods lack speed and point-of-care accessibility for comprehensive urinalysis.

Purpose of the Study:

  • To develop a fast, reusable, electrical sensing microfluidic device for quantitative urinalysis.
  • To enable point-of-care diagnosis through accessible body fluid analysis.

Main Methods:

  • Fabrication of a microfluidic device using soft porous scaffolds decorated with multiwalled carbon nanotubes.
  • Utilizing electrical signal detection for biomarker quantification.
  • Demonstrating reusability via sunlight exposure and mechanical programming of scaffolds.

Main Results:

  • The device successfully detected and quantified red blood cells, Escherichia coli, and albumin.
  • Ex vivo experiments in mouse models showed comparable diagnostic accuracy to existing biochemical tests.
  • The device demonstrated sensitivity, reusability, and mechanical programmability.

Conclusions:

  • The developed bioelectronic device offers a low-cost, rapid, and robust platform for urinalysis.
  • This technology has broad applications for point-of-care disease diagnosis using body fluids.
  • Integration of nanomaterials into soft scaffolds enables mechanically programmable microfluidic bioelectronic devices.