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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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Monovalent and divalent cation effects on phase transitions of iota-carrageenan

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Date

2007-01

Author

Kara, Selim
Arda, Ertan
Pekcan, Mehmet Önder

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Citation

Kara, S., Arda, E. & Pekcan, M. Ö. (2007). Monovalent and divalent cation effects on phase transitions of iota-carrageenan. Journal of Bioactive and Compatible Polymers, 22(1), 42-61. doi:10.1177/0883911506073361

Abstract

Phase transitions Of L-carrageenan in a variety of monovalent (Li, Na, K) and divalent (Mg, Ca, Sr) cation solutions were studied during heating and cooling by using photon transmission technique. Photon transmission intensity (I-tr) was monitored against temperature to determine the transition temperatures and activation energies during the heating and cooling processes in the monovalent and divalent systems. Three distinct transition regions were observed during the heating and cooling cycles for the carrageenan-divalent salt system. At the first step of the heating process, dimer groups were transformed into dimers that presented (g-d) transitions, then these dimers were directly converted into a double helix by undergoing a (d-h) transition. In the higher temperature region, a double helix-to-coil (h-c) transition took place. During the cooling process, these transitions are arranged in the order of (c-h), (h-d), and (d-g). The carrageenan-monovalent salt system presented only coil-to-rod-like helix (c-r) and rod-like helix-to-coil (r-c) transitions during the cooling and heating processes, respectively. A hysteresis was observed between (r-c)-(c-r) and (g-d)-(d-g) transitions for the monovalent and divalent cations, respectively.

Source

Journal of Bioactive and Compatible Polymers

Volume

22

Issue

1

URI

https://hdl.handle.net/11729/271
http://dx.doi.org/10.1177/0883911506073361

Collections

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



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