Critical Exponents of Kappa Carrageenan in the Coil-Helix and Helix-Coil Hysteresis Loops

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Date

2009

Authors

Tarı, Özlem
Kara, Selim
Pekcan, Önder

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Taylor & Francis Inc

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Abstract

The steady-state fluorescence technique was used to study coil-helix (sol-gel) and helix-coil (gel-sol) transitions of the kappa carrageenan-water system with various carrageenan contents. Fluorescence (I) and scattered light (I-sc) intensities were measured against temperature to determine critical phase transition temperatures and exponents. It was observed that the coil-helix transition temperatures T-ch were much lower than the helix-coil (T-hc) transition temperatures due to the hysteresis of the phase transition loops. The gel fraction exponent (beta) was measured and found to be in accord with the classical Flory-Stockmayer model.

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Carrageenan, Critical exponent, Fluorescence, Hysteresis, Transition temperature

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Citation

19

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Q3

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Volume

48

Issue

4

Start Page

812

End Page

822