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Continuous, quantifiable, and simple osmotic preconcentration and sensing within microfluidic devices.

Andrew Jajack1, Isaac Stamper1, Eliot Gomez2

  • 1Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, United States of America.

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We developed a novel microfluidic sample preconcentration method using forward osmosis. This technique rapidly concentrates analytes, overcoming detection challenges for lab-on-a-chip devices.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Materials Science

Background:

  • Next-generation lab-on-a-chip devices face detection limitations.
  • Current methods struggle with sensitivity and broad applicability.
  • Point-of-care and real-time health monitoring require enhanced analyte detection.

Purpose of the Study:

  • To introduce a continuous, quantifiable, and versatile membrane-based microfluidic preconcentration method.
  • To enable broad-spectrum detection improvements for various analytes.
  • To facilitate the development of advanced lab-on-a-chip technologies.

Main Methods:

  • Utilized forward osmosis for rapid analyte preconcentration by water removal.
  • Systematically optimized semi-permeable membranes and draw molecules for osmosis performance.
  • Developed and characterized proof-of-concept preconcentration devices for concentration ability and fouling resistance.
  • Employed in-silico theoretical modeling to predict experimental findings and guide future designs.

Main Results:

  • Achieved 10-100X analyte preconcentration in minutes.
  • Demonstrated broad-spectrum detection improvements across multiple analytes and sensing modalities.
  • Developed inexpensive, ready-for-manufacturing prototypes based on an engineering toolkit.

Conclusions:

  • The presented method overcomes critical detection challenges in lab-on-a-chip devices.
  • This versatile preconcentration technique supports the advancement of point-of-care diagnostics and real-time health monitoring.
  • The developed engineering toolkit enables the design of next-generation microfluidic devices.