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

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Date
2009
Author
Tari, Ozlem
Kara, Selim
Pekcan, Önder
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.

Source

Journal of Macromolecular Science, Part B

Issue

4

Volume

48

Pages

812-822

URI

https://hdl.handle.net/20.500.12469/1099
https://doi.org/10.1080/00222340902956129

Collections

  • Araştırma Çıktıları / WOS [1335]
  • Biyoinformatik ve Genetik / Bioinformatics and Genetics [212]

Keywords

Carrageenan
Critical exponent
Fluorescence
Hysteresis
Transition temperature

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