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Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity.

Miguel Coll Crespi1, Gaston A Crespo2, Xiaojiang Xie3

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.

Talanta
|November 8, 2017
PubMed
Summary

A novel heterogeneous pH buffer using colloidal emulsions can be integrated into hydrogels. This pH buffer system maintains hydrogel properties while effectively controlling pH near electrode surfaces.

Keywords:
AgaroseDonnan failureHeterogeneous pH bufferHydrogel membranesIonophorePermselectivityTridodecylamine

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Developing stable and effective pH buffering systems is crucial for various electrochemical applications.
  • Integrating buffering capabilities directly into hydrogel matrices without compromising their intrinsic properties presents a significant challenge.

Purpose of the Study:

  • To describe a novel heterogeneous pH buffer based on colloidal emulsions for hydrogel integration.
  • To investigate the pH buffering mechanism and its dependence on cation properties.
  • To evaluate the impact of the integrated buffer on hydrogel permselectivity and its ability to control local pH.

Main Methods:

  • Fabrication of a heterogeneous pH buffer using ion-exchanger and lipophilic base within a colloidal emulsion.
  • Titration experiments in aqueous emulsion to study ion-exchange mechanisms and buffer action.
  • Integration of the pH buffer emulsion into agarose hydrogels.
  • Electrochemical characterization using zero current potentiometry and direct contact with a pH electrode.

Main Results:

  • The colloidal emulsion buffer can be integrated into hydrogels without altering their ion-exchange properties.
  • Buffer performance is influenced by cation nature and concentration, with lipophilicity affecting pH equilibrium.
  • Agarose gels with entrapped buffers showed negligible permselectivity, similar to unmodified gels, above 1mM ionic strength.
  • The integrated buffer successfully controlled pH in the vicinity of a pH electrode surface within a gel film.

Conclusions:

  • A novel heterogeneous pH buffer system based on colloidal emulsions is effective for hydrogel integration.
  • This buffering approach does not introduce significant ion-exchange properties to the hydrogel matrix.
  • The developed system demonstrates potential for localized pH control in electrochemical applications, such as near electrode surfaces.