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Phase diagrams of hybrid carrageenans extracted from Ahnfeltiopsis devoniensis and Chondrus crispus.
Carbohydr Polym. 2016 Jan 20; 136:449-58.CP

Abstract

NaCl and KCl phase diagrams of two kappa/iota-hybrid carrageenans (KI) are established, and the rheological properties of obtained solutions and gels are reported. KI were extracted from Ahnfeltiopsis devoniensis and Chondrus crispus seaweeds and showed different chemical composition, 48 mol% of kappa carrageenan (K) and 52 mol% of iota carrageenan (I), and 78 mol% of K and 22 mol% of I, respectively. Phase diagrams are systematically compared those of blends of commercial K and I (K+I) showing equivalent chemical compositions. Results confirm that KI clearly differ from mixtures of K and I. K+I form gels at lower polysaccharide concentration and ionic strength, and exhibit gel separation from a liquid phase when large amount (>0.1 mol/L) of KCl is used. In contrast, no syneresis was found in KI gels formed under similar conditions. Both KI and K+I gels are strain hardening, and show a concentration scaling of the elasticity with exponents ranging from 1.1 to 3.2 depending on the type of salt and ionic strength. The strain at break of KI gels does not show salt specificity and is similar to the strain at break of K+I gels in KCl under similar salt and polysaccharide concentrations. K+I gels in NaCl are more fragile than in KCl, thus showing salt specificity.

Authors+Show Affiliations

Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; Department of Chemical Engineering, University of Santiago de Compostela, Lope Gómez de Marzoa St, Santiago de Compostela E-15782, Spain. Electronic address: mariadolores.torres.perez@usc.es.Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. Electronic address: loic@dep.uminho.pt.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26572375

Citation

Torres, M D., et al. "Phase Diagrams of Hybrid Carrageenans Extracted From Ahnfeltiopsis Devoniensis and Chondrus Crispus." Carbohydrate Polymers, vol. 136, 2016, pp. 449-58.
Torres MD, Azevedo G, Hilliou L. Phase diagrams of hybrid carrageenans extracted from Ahnfeltiopsis devoniensis and Chondrus crispus. Carbohydr Polym. 2016;136:449-58.
Torres, M. D., Azevedo, G., & Hilliou, L. (2016). Phase diagrams of hybrid carrageenans extracted from Ahnfeltiopsis devoniensis and Chondrus crispus. Carbohydrate Polymers, 136, 449-58. https://doi.org/10.1016/j.carbpol.2015.09.015
Torres MD, Azevedo G, Hilliou L. Phase Diagrams of Hybrid Carrageenans Extracted From Ahnfeltiopsis Devoniensis and Chondrus Crispus. Carbohydr Polym. 2016 Jan 20;136:449-58. PubMed PMID: 26572375.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Phase diagrams of hybrid carrageenans extracted from Ahnfeltiopsis devoniensis and Chondrus crispus. AU - Torres,M D, AU - Azevedo,G, AU - Hilliou,L, Y1 - 2015/09/08/ PY - 2015/06/05/received PY - 2015/08/03/revised PY - 2015/09/04/accepted PY - 2015/11/18/entrez PY - 2015/11/18/pubmed PY - 2016/9/22/medline KW - Hybrid carrageenan KW - Potassium KW - Rheology KW - Sodium KW - Sol–gel transition SP - 449 EP - 58 JF - Carbohydrate polymers JO - Carbohydr Polym VL - 136 N2 - NaCl and KCl phase diagrams of two kappa/iota-hybrid carrageenans (KI) are established, and the rheological properties of obtained solutions and gels are reported. KI were extracted from Ahnfeltiopsis devoniensis and Chondrus crispus seaweeds and showed different chemical composition, 48 mol% of kappa carrageenan (K) and 52 mol% of iota carrageenan (I), and 78 mol% of K and 22 mol% of I, respectively. Phase diagrams are systematically compared those of blends of commercial K and I (K+I) showing equivalent chemical compositions. Results confirm that KI clearly differ from mixtures of K and I. K+I form gels at lower polysaccharide concentration and ionic strength, and exhibit gel separation from a liquid phase when large amount (>0.1 mol/L) of KCl is used. In contrast, no syneresis was found in KI gels formed under similar conditions. Both KI and K+I gels are strain hardening, and show a concentration scaling of the elasticity with exponents ranging from 1.1 to 3.2 depending on the type of salt and ionic strength. The strain at break of KI gels does not show salt specificity and is similar to the strain at break of K+I gels in KCl under similar salt and polysaccharide concentrations. K+I gels in NaCl are more fragile than in KCl, thus showing salt specificity. SN - 1879-1344 UR - https://www.unboundmedicine.com/medline/citation/26572375/Phase_diagrams_of_hybrid_carrageenans_extracted_from_Ahnfeltiopsis_devoniensis_and_Chondrus_crispus_ DB - PRIME DP - Unbound Medicine ER -