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Journal of Bioactive and Compatible Polymers
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Hysteresis During Sol-Gel and Gel-Sol Phase Transitions of k-Carrageenan: A Photon Transmission Study

Selim Kara

Department of Physics Trakya University 22030 Edirne, Turkey

Candan Tamerler

Department of Molecular Biology and Genetics Istanbul Technical University Maslak 80626, Istanbul, Turkey

Hakan Bermek

Department of Molecular Biology and Genetics Istanbul Technical University Maslak 80626, Istanbul, Turkey

Önder Pekcan

Department of Molecular Biology and Genetics Istanbul Technical University Maslak 80626, Istanbul, Turkey

Photon transmission techniques were used to study sol-gel and gel-sol transitions in k-carrageenan-water systems with various carrageenan contents. The photon transmission intensity, I tr was monitored against temperature to determine critical phase transition temperatures and transition rates. It was observed that the sol-gel transition temperatures, T sg, were found much lower than the gel-sol, T gs, transition temperatures based on the hysteresis of the phase transition loops. Sol-gel and gel-sol activation energies were determined and it was found that a carrageenan-water system required less energy for the gel-sol transition than for the sol-gel transition.

Key Words: carragenan • phase transition • hysteresis • photon transmission

Journal of Bioactive and Compatible Polymers, Vol. 18, No. 1, 33-44 (2003)
DOI: 10.1177/0883911503018001004
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S. Kara, E. Arda, and O. Pekcan
Monovalent and Divalent Cation Effects on Phase Transitions of {iota}-carrageenan
Journal of Bioactive and Compatible Polymers, January 1, 2007; 22(1): 42 - 61.
[Abstract] [PDF]