Comparison of cation effects on phase transitions of kappa and iota carrageenan

dc.contributor.authorTari, Özlem
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:05:10Z
dc.date.available2019-06-27T08:05:10Z
dc.date.issued2010
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
dc.description.abstractPhase transitions of kappa and iota carrageenan in KCl NaCl and CaCl2 solutions were separately studied during heating and cooling processes by using fluorescence technique. Scattered light I-SC and fluorescence intensity I was monitored against temperature to determine the critical transition temperatures and exponents. Kappa and iota carrageenans with monovalent (KCl NaCl) salt system presented only coil to double helix (c-h) and double helix to coil (h-c) transitions upon cooling and heating processes respectively. Two transition regions were observed in both heating and cooling of the iota carrageenan in CaCl2 solution while in kappa carrageenan only (c-h) and (h-c) transitions was detected. During heating dimers decompose into double helices by making (d-h) transition. At the high temperature region (h-c) transition takes place. During cooling back transitions repeat themselves. A hysteresis was observed between (h-c) and (c-h) for the kappa and iota carrageenan salt system (except CaCl2) respectively. Dimer to double helix (d-h) and double helix to dimer (h-d) transitions were observed for iota carrageenan in CaCl2 salt. The gel fraction exponent beta was measured and found to be in accord with the classical Flory-Stockmayer Model for both kappa and iota carrageenan salt systems.en_US]
dc.identifier.citation0
dc.identifier.issn1618-7229en_US
dc.identifier.issn1618-7229
dc.identifier.scopus2-s2.0-77956922694en_US
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1039
dc.identifier.wosWOS:000281195500001en_US
dc.identifier.wosqualityN/A
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherEuropean Polymer Federationen_US
dc.relation.journalE-Polymersen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.titleComparison of cation effects on phase transitions of kappa and iota carrageenanen_US
dc.typeArticleen_US
dspace.entity.typePublication

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