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Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
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A Microfluidic, Flow-Through, Liquid Reagent Fluorescence Sensor Applied to Oxygen Concentration Measurement.

Dominik Gril1, Denis Donlagic1

  • 1Laboratory for Electro Optics and Sensor Systems, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska Cesta 46, 2000 Maribor, Slovenia.

Sensors (Basel, Switzerland)
|July 11, 2023
PubMed
Summary
This summary is machine-generated.

A novel microfluidic fluorescent sensor measures dissolved oxygen in water using on-line reagent mixing and fluorescence decay time. This system offers low reagent and sample consumption for continuous monitoring.

Keywords:
capillariesfluorescent decay time measurementsfluorescent sensorsliquid reagentmicrofluidicmicrofluidic sensing systemson-line liquid analysisoptical fibersoxygen sensing

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Area of Science:

  • Analytical Chemistry
  • Chemical Sensing
  • Microfluidics

Background:

  • Accurate dissolved oxygen measurement is crucial for environmental monitoring.
  • Traditional methods can be cumbersome and have limitations in continuous monitoring.
  • Microfluidic systems offer miniaturization and reduced reagent consumption.

Purpose of the Study:

  • To present and demonstrate a microfluidic fluorescent chemical sensing system.
  • To develop a sensor for the measurement of dissolved oxygen in water.
  • To showcase a system with low reagent and sample consumption for continuous monitoring.

Main Methods:

  • Utilized on-line mixing of a fluorescent reagent with the analyzed sample.
  • Measured the fluorescence decay time of the mixture.
  • Constructed the system using silica capillaries and optical fibers.

Main Results:

  • Demonstrated a microfluidic sensor for dissolved oxygen measurement.
  • Achieved very low consumption of reagent (mL/month) and sample (L/month).
  • Enabled continuous on-line measurements with a variety of fluorescent reagents.

Conclusions:

  • The proposed microfluidic system is suitable for continuous on-line dissolved oxygen monitoring.
  • The flow-through design minimizes issues like bleaching and heating.
  • High signal amplitudes allow for low-noise detection and use of reagents with nanosecond lifetimes.