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Miniaturized pH biosensors based on electrochemically modified electrodes with biocompatible polymers.
Boris Lakard1, Guillaume Herlem, Michel de Labachelerie
1LCMI, UFR Sciences, Université de Franche-Comté, 16 route de Gray, Besançon 25030, France. boris.lakard@univ-fcomte.fr
Biosensors & Bioelectronics
|December 20, 2003
Summary
New biocompatible polymer films create sensitive and stable potentiometric pH sensors. These miniaturized biosensors show promise for clinical and dermatological applications, offering an alternative to traditional pH measurement devices.
Area of Science:
- Electrochemistry
- Polymer Science
- Biosensor Technology
Background:
- Potentiometric pH sensors are crucial for clinical, dermatological, and biological applications.
- Developing stable, sensitive, and biocompatible pH sensing materials is an ongoing challenge.
- Synthetic enzymes and biocompatible polymers offer potential for advanced biosensor development.
Purpose of the Study:
- To develop novel potentiometric pH sensors using linear polyethylenimine (L-PEI) and linear polypropylenimine (L-PPI) films.
- To investigate the performance of these sensors for in vivo and clinical applications.
- To create a miniaturized pH biosensor as an alternative to conventional devices.
Main Methods:
- Electropolymerization of ethylenediamine (EDA), 1,3-diaminopropane (1,3-DAP), and diethylenetriamine (DETA) to form polymer films.
- Coating polymer films onto platinum electrodes for potentiometric measurements.
- Fabrication of a miniaturized sensor using photolithography, sputtering, and lift-off processes.
Main Results:
- Polymer films exhibited good linear potentiometric responses to pH changes (pH 3-10).
- The developed electrodes demonstrated excellent reversibility and stability over time.
- A miniaturized pH biosensor was successfully fabricated and tested for one month.
Conclusions:
- Linear polyethylenimine and polypropylenimine films are suitable for potentiometric pH sensing.
- The developed miniaturized pH biosensor offers a viable alternative to existing technologies in dermatology.
- These biocompatible polymer-based sensors hold potential for various in vivo analytical applications.