In Situ Amperometric Detection of Vesicles and Microgel Phases in an Aggregating System: Calcium Alginate

In situ amperometric characterization of an aggregating system in terms of molecular adsorption and single microparticle interactions at the electrode interface is demonstrated using a model system: alginate/Ca(II) in an aqueous electrolyte solution. Recording of chronoamperometric curves of oxygen...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2007-02, Vol.19 (4), p.473-478
Main Authors: DeNardis, Nadica Ivošević, Žutić, Vera, Svetličić, Vesna, Urbani, Ranieri
Format: Article
Language:English
Subjects:
Amperometric detection
Calcium alginate
Dropping mercury electrode
Gel microparticles
Vesicles
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Summary:In situ amperometric characterization of an aggregating system in terms of molecular adsorption and single microparticle interactions at the electrode interface is demonstrated using a model system: alginate/Ca(II) in an aqueous electrolyte solution. Recording of chronoamperometric curves of oxygen reduction at the dropping mercury electrode is designed for detection of dip‐shaped signals of individual gel microparticles. By addition of Ca(II) decrease of alginate adsorption is accompanied by appearance of signals indicating vesicle type association of alginate molecules and microparticles of gel phase. AFM imaging provided evidence of initial stage in calcium alginate gel formation.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.200603750