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Related Experiment Videos

Rapid method for the preparation of a robust optical pH sensor.

Haley R Kermis1, Yordan Kostov, Govind Rao

  • 1Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.

The Analyst
|October 8, 2003
PubMed
Summary

This study presents a new, simple method for creating a reusable optical pH sensor using a modified fluorescent dye (MA-HPDS) immobilized on a polymer matrix. The sensor demonstrates excellent reproducibility and stability for pH monitoring.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Fluorescence-based optical sensors offer advantages for pH monitoring.
  • Immobilization of pH indicator dyes is crucial for sensor stability and reusability.
  • Existing methods for dye immobilization can be complex or lead to leaching.

Purpose of the Study:

  • To develop a simple, rapid, and robust method for preparing a fluorescence-based optical pH sensor.
  • To covalently immobilize a modified pH indicator dye (MA-HPDS) onto a polymer matrix.
  • To characterize the performance of the immobilized sensor for pH detection.

Main Methods:

  • Synthesized a methacryloyl-modified analog of 8-hydroxy-1,3,6-pyrene trisulfonic acid (HPTS), named MA-HPDS.
  • Copolymerized MA-HPDS with poly(ethylene glycol) diacrylate (PEG-DA) via free radical polymerization for simultaneous immobilization and purification.

Related Experiment Videos

  • Evaluated sensor performance including pH range, reproducibility, leaching, and autoclavability.

    • Main Results:

    • Achieved covalent immobilization of MA-HPDS onto a PEG-DA matrix with minimal dye leaching.
    • The resulting sensor is fully autoclavable and operates effectively over the pH range of 6-9.
    • Demonstrated excellent reproducibility and predictable ionic strength effects on the sensor's apparent pKa.

    Conclusions:

    • The developed method provides a simple and rapid approach for creating stable, reusable optical pH sensors.
    • The MA-HPDS/PEG-DA copolymer sensor exhibits robust performance characteristics suitable for various applications.
    • This technique offers a promising platform for advanced optical sensing technologies.