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pH- and voltage-responsive chitosan hydrogel through covalent cross-linking with catechol.

Yongchao Zhang1, Yanique Thomas, Eunkyoung Kim

  • 1Department of Chemistry, Morgan State University, Baltimore, Maryland 21251, USA. yongchao.zhang@morgan.edu

The Journal of Physical Chemistry. B
|January 11, 2012
PubMed
Summary

A novel covalent cross-linking method for chitosan utilizes catechol oxidation. The resulting films exhibit pH-responsive behavior for trapping and releasing negatively charged probes, crucial for electrochemical applications.

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Area of Science:

  • Biomaterials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Chitosan, a natural polysaccharide, is widely explored for biomedical and electrochemical applications.
  • Developing robust and functional chitosan-based materials requires effective cross-linking strategies.
  • Existing cross-linking methods may lack pH-responsiveness or stability under harsh conditions.

Purpose of the Study:

  • To develop a new method for covalently cross-linking chitosan using catechol.
  • To investigate the pH-responsive properties of the catechol-cross-linked chitosan films.
  • To evaluate the influence of fabrication techniques on chitosan film characteristics.

Main Methods:

  • Chemical oxidation of catechol to o-quinone.
  • Michael addition and Schiff base formation for chitosan cross-linking.

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  • Cyclic voltammetry and electrochemical impedance spectroscopy (EIS) for film characterization.

    • Main Results:

    • A new covalent cross-linking method for chitosan was successfully developed.
    • The catechol-cross-linked chitosan films demonstrated pH-responsive, switchlike behavior.
    • Films effectively trapped and released negatively charged redox probes (Fe(CN)(6)(3-/4-)) based on pH and applied voltage.
    • Fabrication methods significantly impacted the electrochemical properties of the chitosan films.

    Conclusions:

    • Catechol-based covalent cross-linking offers a robust method for creating functional chitosan materials.
    • The developed chitosan films exhibit tunable properties for potential use in electrochemical sensing or controlled release systems.
    • Understanding the impact of fabrication methods is critical for optimizing chitosan film performance.