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A Percolation Approach for Investigating the Sol-Gel Phase Transition of -Carrageenan: A Steady-State Fluorescence Study

Department of Physics, Istanbul Technical University, Maslak 34469, Istanbul, Turkey

Ö. Pekcan

Department of Physics, Istanbul Technical University, Maslak 34469, Istanbul, Turkeypekcan9{at}itu.edu.tr

A steady-state fluorescence technique was employed to study sol-gel transitions in K-carrageenan systems at various carrageenan concentrations. Scattered light, Isc, and fluorescence intensity, I, were monitored against temperature to determine critical phase transition temperatures and exponents. Pyranine was used as a fluorescence probe to monitor these phase transitions. It was observed that coil-to-helix (sol-gel) transition temperatures, Tch, strongly correlated with carrageenan concentration. The weight average degree of polymerization, DPw and gel fraction G, exponents ( and ß) were measured and found to be in accord with the classical Flory-Stockmayer model.

Key Words: carrageenan • coil-to-helix • percolation • critical exponents • pyranine • fluorescence-probe

Journal of Bioactive and Compatible Polymers, Vol. 19, No. 6, 491-509 (2004)
DOI: 10.1177/0883911504048328


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