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  • 1- Fakülteler | Faculties
  • Fen Edebiyat Fakültesi / Faculty of Arts and Sciences
  • Fizik Bölümü / Department of Physics
  • FEF - Makale Koleksiyonu | Fizik Bölümü / Department of Physics
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Molecular recognition during sol-gel and gel-sol transition of kappa-iota carrageenan mixtures

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Date

2005-12

Author

Kara, Selim
Arda, Ertan
Pekcan, Mehmet Önder

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Citation

Arda, E., Kara, S. & Pekcan, M. Ö. (2005). Molecular recognition during sol-gel and gel-sol transition of kappa-iota carrageenan mixtures. Phase Transitions, 78(12), 915-926. doi:10.1080/01411590500420766

Abstract

Sol-gel and gel-sol phase transitions of kappa-iota (kappa-iota) carrageenan mixtures in two types of salts were studied using photon transmission technique. Here, KCl and CaCl2 were chosen as the proper salts for the carrageenan mixtures. Coil-to-double helix (c-h) and double helix-to-dimer (h-d) phase transitions of carrageenan mixtures in monovalent and bivalent cation solutions were studied upon heating and cooling by using photon transmission technique. Photon transmission intensity, It, was monitored against temperature to determine the (c-h) and (h-d) transition temperatures (T-ch and T-nd). Two distinct transition regions were observed in both heating and cooling of the carrageenan-bivatent CaCl2 salt system. At the first step of heating process dimers decompose into double helices by making (d-h) transition. At the high temperature region (h-c) transition takes place. Carrageenan-monovalent KCl salt system presented only (c-h) and (h-c) transitions upon cooling and heating processes. Transition temperatures at the heating and cooling processes were obtained. A hysteresis was observed between (h-c)-(c-h) and (d-h)-(h-d) transitions for the monovalent and bivalent cations respectively.

Source

Phase transitions

Volume

78

Issue

12

URI

https://hdl.handle.net/11729/168
http://dx.doi.org/10.1080/01411590500420766

Collections

  • FEF - Makale Koleksiyonu | Fizik Bölümü / Department of Physics [147]
  • Scopus İndeksli Makale Koleksiyonu [793]
  • WoS İndeksli Makale Koleksiyonu [810]



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