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Related Experiment Videos

Urea determination using pH-enzyme electrode.

R Koncki1, A Chudzik, I Walcerz

  • 1Department of Chemistry, University of Warsaw, Poland. rkoncki@chem.uw.edu.pl

Journal of Pharmaceutical and Biomedical Analysis
|March 4, 2000
PubMed
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A novel potentiometric biosensor using a pH-membrane electrode and urease successfully determined urea concentrations. This system is suitable for analyzing real samples in biomedical and pharmaceutical applications.

Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Electrochemistry

Background:

  • Urea determination is crucial in various biomedical and pharmaceutical analyses.
  • Potentiometric sensors offer a sensitive method for ion detection.
  • Developing efficient biosensors requires robust electrode modification and integration into analytical systems.

Purpose of the Study:

  • To construct a potentiometric biosensor for urea determination.
  • To enzymatically modify a pH-membrane electrode with urease.
  • To evaluate the biosensor's performance in a flow injection analysis (FIA) system for real-world samples.

Main Methods:

  • Fabrication of a pH-membrane electrode utilizing n-tridodecylamine (TDDA) as the ionophore.
  • Covalent immobilization of urease onto the potentiometric membrane surface.

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  • Integration of the modified electrode into a double-channel flow injection analysis (FIA) system.

    • Main Results:

    • The developed biosensor enabled reproducible urea determination within the millimolar concentration range.
    • The biosensor-FIA system demonstrated utility in analyzing various real samples.
    • The system's performance was investigated for potential applications in urine, post-hemodialysis fluid, and pharmaceutical ointments.

    Conclusions:

    • A functional potentiometric biosensor for urea analysis was successfully developed.
    • The biosensor-FIA system offers a viable method for urea quantification in complex matrices.
    • The system holds promise for applications in clinical diagnostics and pharmaceutical quality control.