title: Molecular and rheological characterization of carrageenan solutions extracted from Kappaphycus alvarezii.
abstract: This study evaluates and relates the molecular and rheological characteristics of native carrageenan obtained from Kappaphycus alvarezii seaweed. Native carrageenan was extracted by a differentiated methodology by atomization drying process, which reduces the time for obtaining carrageenan dry powder and minimizes costs and environmental damages. Rheological properties of native carrageenan were compared with a commercial carrageenan grade. Molecular properties were performed by SAXS and GPC analysis and the rheological properties by DMTA and stress relaxation tests. Molecular analysis proved a folded and compact molecular structure and indicated the presence of chains with different molecular weights for native carrageenan. The results obtained showed that the helix-coil transition occurs at temperature about 50 °C. The native and commercial grade carrageenan presented the characteristic of viscoelastic materials and their gel properties show a higher contribution from solid elastic component, and the initial force (F(0)) was higher in commercial carrageenan than native one.
authors.affiliation: Departamento de Ciência e Tecnologia de Alimentos, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rod. Admar Gonzaga, 1346 Itacorubi, 88034-001 Florianópolis, SC, Brazil. vaniwe@hotmail.com
authors.forename: Vanessa
authors.initials: V
authors.lastname: Webber
authors.forename: Sabrina Matos
authors.initials: SM
authors.lastname: de Carvalho
authors.forename: Pedro Luiz Manique
authors.initials: PL
authors.lastname: Barreto
mesh_terms: D002351:Carrageenan / Q000737:chemistry* / Q000302:isolation & purification; D002850:Chromatography, Gel; D012212:Rheology; D000461:Rhodophyta / Q000737:chemistry*; D053838:Scattering, Small Angle; D012996:Solutions; D013696:Temperature
chemical_list: D012996:Solutions; D002351:Carrageenan