Naslov
Electrochemical characterization of an aggregating system: calcium-alginate

Autori
Ivošević, Nadica ; Urbani, Ranieri ; Žutić, Vera ; Svetličić, Vesna

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 3rd Croatian Symposium on Electrochemistry / Gojo, Miroslav - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2004, 171-174

Skup
3rd Croatian Symposium on Electrochemistry

Mjesto i datum
Dubrovnik, Hrvatska, 30.05.2004. - 03.06.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
alginate gel; electrochemical signals of gel microparticles; calcium-alginate systems

Sažetak
Formation of alginate gel microparticles (size range 10-300 &micro ; m) induced by calcium addition in an aqueous electrolyte solution was characterized by chronoamperometry at the dropping mercury electrode (DME). The conformational transition of alginate in solution in the presence of divalent cations leads to the formation of physical hydrogel (non-covalently cross linked network). The transformation of alginate free polymers in a solution to gel microparticles, was measured through distinct differentiation of electrochemical response of polymer adsorption from interaction of individual GeP at the DME/solution interface. In this study we present the electrochemical signals of alginate GeP that appear owing to their specific interactions at the DME/aqueous electrolyte interface. Adding calcium (30 mM) to alginate solution (50 mg/L) maximum in GeP concentration was reached (10^7/L) whereas the concentration of free polymers decreased to 15 mg/L. The aim of this work was to validate in situ electrochemical methodology for studying aggregation and gellation of biopolymers in seawater.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA