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Continuous-flow multi-analyte biosensor cartridge with controllable linear response range.

Olivier Frey1, Sara Talaei, Peter D van der Wal

  • 1Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Sensors, Actuators and Microsystems Laboratory (SAMLAB), Rue Jaquet-Droz 1, 2000, Neuchâtel, Switzerland. olivier.frey@epfl.ch

Lab on a Chip
|July 29, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel microfluidic biosensor cartridge for continuous analyte measurement. The device uses enzyme-modified electrodes and laminar flow to enhance sensitivity and linear detection range for glucose and lactate.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Microfluidics

Background:

  • Biosensors are crucial for real-time monitoring of biological analytes.
  • Microfluidic systems offer miniaturization and enhanced control for biosensing applications.
  • Existing microfluidic biosensors face challenges in membrane deposition and sensitivity control.

Purpose of the Study:

  • To design and fabricate a novel microfluidic biosensor cartridge.
  • To enable continuous and simultaneous measurement of analytes.
  • To address key challenges in microfluidic biosensor design, including enzyme immobilization and sensitivity tuning.

Main Methods:

  • Fabrication of a disposable PDMS and SU-8 cartridge using rapid prototyping.
  • Enzymatic membrane deposition via external microfluidic channels.
  • Creation of a dynamic diffusion layer using laminar sheath-flow of sample and buffer.
  • Amperometric detection of hydrogen peroxide using enzyme-modified electrodes.
  • Computational Fluid Dynamics (CFD) simulations for fluid dynamics and diffusion analysis.

Main Results:

  • Successful fabrication of a low-integrated, disposable microfluidic biosensor cartridge.
  • Demonstrated decoupling of membrane deposition from cartridge fabrication.
  • Achieved adjustable sensitivity and linear response range through controlled diffusion layer thickness.
  • Obtained high sensitivity for glucose (157±28 nA/mM) and lactate (79±12 nA/mM).
  • Extended the linear response range for glucose and lactate up to 15 mM with a 0.2 mM limit of detection.

Conclusions:

  • The developed microfluidic biosensor cartridge effectively addresses critical design challenges.
  • The device offers enhanced control over sensor performance, including sensitivity and linear range.
  • The findings support the potential of this biosensor for continuous and simultaneous analyte monitoring.