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In Situ Amperometric Detection of Vesicles and Microgel Phases in an Aggregating System: Calcium Alginate
Author(s) -
DeNardis Nadica Ivošević,
Žutić Vera,
Svetličić Vesna,
Urbani Ranieri
Publication year - 2007
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200603750
Subject(s) - amperometry , calcium alginate , chemistry , microparticle , adsorption , vesicle , electrolyte , electrode , in situ , calcium , aqueous solution , chromatography , chemical engineering , electrochemistry , membrane , organic chemistry , biochemistry , engineering
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.