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Biosensor design based on Marangoni flow in an evaporating drop.

Joshua R Trantum1, Mark L Baglia, Zachary E Eagleton

  • 1Department of Biomedical Engineering, Vanderbilt University, VU Station B 351631, Nashville, TN 37235, USA. rick.haselton@vanderbilt.edu.

Lab on a Chip
|November 22, 2013
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Summary

This study introduces a novel biosensor for point-of-care diagnostics. It utilizes Marangoni stresses in evaporating droplets to concentrate biomarkers, enabling low-cost, rapid detection with a limit of 100 fM.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Effective point-of-care diagnostics demand low-cost, simple assays with clinically relevant detection limits.
  • Current diagnostic methods often face challenges in achieving sensitivity and simplicity simultaneously.

Purpose of the Study:

  • To develop and validate a novel biosensor leveraging secondary flows from surface Marangoni stresses for biomarker concentration.
  • To establish a visually detectable signal proportional to target concentration for point-of-care applications.

Main Methods:

  • Utilized secondary flows from surface Marangoni stresses in evaporating droplets to concentrate target-mediated particle aggregates.
  • Employed optical coherence tomography to analyze particle motion influenced by cross-sectional flow fields.
  • Investigated the impact of substrate material (PDMS vs. ITO-coated glass) and solution additives (salts, glycerol) on Marangoni-induced flows.

Main Results:

  • Demonstrated biomarker concentration via Marangoni stresses, forming a visually detectable spot whose size correlates with target concentration.
  • Achieved a limit of detection of approximately 100 fM for the M13K07 bacteriophage using functionalized 1 μm particles.
  • Showcased rapid signal generation, with ~80% of maximum signal achieved within 10 minutes for a 1 μL sample on PDMS.

Conclusions:

  • The developed biosensor offers a promising strategy for low-cost, rapid, and sensitive point-of-care diagnostics.
  • Marangoni stresses in evaporating droplets provide an effective mechanism for concentrating target analytes.
  • Substrate selection and solution composition are critical factors for optimizing signal generation in this evaporation-driven assay.