Naslov
Interactions in Mixtures of Cationic Surfactants and Oppositely Charged Biopolymers

Autori
Vinceković, Marko ; Bujan, Marija ; Šmit, Ivan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
12. godišnji sastanak Hrvatskog društva za elektronsku mikroskopiju / - , 2004

Skup
12. godišnji sastanak Hrvatskog društva za elektronsku mikroskopiju

Mjesto i datum
Rijeka, Hrvatska, 17.12.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
biopolymers; surfactants

Sažetak
Interactions in mixtures of n-dodecylammonium chloride (DDACl) and κ -, ι - and  -carrageenan (CAR) have been investigated by surface tension, conductometry, light microscopy, light scattering microelectrophoretic and X-ray measurements. The phase behavior in dilute water corner includes the regimes of soluble and insoluble complexes. Various polyelectrolyte-surfactant complexes (PSC) were formed at the air/solution interface and in bulk. The effect of the carrageenan concentration on the critical aggregation concentration (cac) and critical micelle concentration (cmc) was found to be very weak. The increase of carrageenan charge density increases the cac and cac/cmc ratio, and shifts the precipitation region towards higher concentration of both components. Factors governing the PSC formation were discussed in terms of electrostatic interactions, conformation, flexibility of the polyelectrolyte chains and entropy gain due to released carrageenan counterions. Formation of giant vesicles even at low carrageenan concentration and structural properties of insoluble complexes revealed lamellar ordering as an important feature of the DDACl/CAR systems.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Prehrambena tehnologija

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