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Issue 37, 2012
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Electrochemically stimulated release of lysozyme from an alginate matrix cross-linked with iron cations

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Abstract

An electrochemically generated alginate matrix cross-linked with Fe3+ cations was used to entrap lysozyme and then release it upon application of an electrochemical signal. The switchable behavior of the alginate hydrogel was based on the different interaction of Fe3+ and Fe2+ cations with alginate. The oxidized Fe3+ cations strongly interact with alginate resulting in its cross-linking and formation of the hydrogel, while the reduced Fe2+ cations weakly interact with alginate and do not keep it in the hydrogel state. Thus, the electrochemical oxidation of iron cations at +0.8 V (Ag/AgCl) in the presence of alginate and lysozyme resulted in the Fe3+-cross-linked alginate hydrogel thin-film on the electrode surface with the physically entrapped lysozyme. On the other hand, application of reductive potentials (e.g. −1.0 V) converted the iron cations to the Fe2+ state, thus resulting in dissolution of the alginate thin-film and lysozyme release. The bactericidal effect of the electrochemically released lysozyme was tested on the Gram-positive bacterium Micrococcus luteus demonstrating the same activity as the unadulterated lysozyme commercially supplied by Sigma-Aldrich. The present result represents the first step towards drug delivering systems (exemplified by the lysozyme release) based on alginate hydrogels and activated by electrochemical stimuli.

Graphical abstract: Electrochemically stimulated release of lysozyme from an alginate matrix cross-linked with iron cations

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Publication details

The article was received on 30 Mar 2012, accepted on 24 May 2012 and first published on 24 May 2012


Article type: Paper
DOI: 10.1039/C2JM32008H
J. Mater. Chem., 2012,22, 19523-19528

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    Electrochemically stimulated release of lysozyme from an alginate matrix cross-linked with iron cations

    Z. Jin, A. M. Harvey, S. Mailloux, J. Halámek, V. Bocharova, M. R. Twiss and E. Katz, J. Mater. Chem., 2012, 22, 19523
    DOI: 10.1039/C2JM32008H

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