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Optical sensor for interstitial pH measurements.

Francesco Baldini1, Ambra Giannetti, Andrea A Mencaglia

  • 1Nello Carrara Institute of Applied Physics, CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy. f.baldini@ifac.cnr.it

Journal of Biomedical Optics
|May 5, 2007
PubMed
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This study presents an optical fiber sensor for real-time pH monitoring in interstitial fluid using microdialysis. The novel sensor achieves high accuracy and resolution, demonstrating potential for in vivo physiological measurements.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Accurate pH monitoring of interstitial fluid is crucial for understanding physiological states.
  • Existing methods for interstitial fluid pH measurement can be invasive or lack real-time capabilities.

Purpose of the Study:

  • To develop and validate an optical fiber sensor for continuous interstitial fluid pH measurement.
  • To assess the sensor's performance using microdialysis and in vivo testing.

Main Methods:

  • A microfluidic system combining microdialysis with a pH-sensitive glass capillary.
  • Covalent immobilization of phenol red pH indicator onto the capillary's inner surface.
  • An optoelectronic unit utilizing LEDs and photodetectors connected via optical fibers.

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Main Results:

  • The optical fiber sensor achieved a resolution of 0.03 pH units and an accuracy of 0.07 pH units.
  • Preliminary in vivo tests were successfully conducted on pigs with induced respiratory alterations.
  • Demonstrated feasibility of real-time pH monitoring in subcutaneous adipose tissue.

Conclusions:

  • The developed optical fiber sensor offers a promising tool for minimally invasive, real-time interstitial fluid pH monitoring.
  • The sensor's performance suggests potential applications in critical care and physiological research.
  • Further in vivo studies are warranted to explore broader clinical applications.