title: Rheological behavior and non-enzymatic degradation of a sulfated galactan from Halymenia durvillei (Halymeniales, Rhodophyta).
abstract: The rheological behavior of a sulfated galactan extracted from Halymenia durvillei, a red seaweed collected in the coastal waters of a small island of Madagascar (Nosy-be in Indian Ocean), was investigated in dilute and semi-dilute solutions. In dilute solution with NaCl at 0.3 M, the polysaccharide adopted a coil conformation whereas, at higher concentrations, the polymer had the behavior of shear-thinning fluid, typical of polymer with high molar mass or semi-rigid conformation. Degradations of this lambda carrageenan-like, using radical depolymerization, and high-pressure homogenization led to several samples of various and controlled molar masses. The measure of their intrinsic viscosities permitted the determination of the relationship of Mark-Houwink-Sakurada.
authors.affiliation: Clermont Université, Université Blaise Pascal, Institut Pascal UMR CNRS 6602, Polytech' Clermont Ferrand, 24 Avenue des Landais, BP-20206, 63174 Aubière, France.
authors.forename: Taratra André
authors.initials: TA
authors.lastname: Fenoradosoa
authors.forename: Céline
authors.initials: C
authors.lastname: Laroche
authors.forename: Cedric
authors.initials: C
authors.lastname: Delattre
authors.forename: Virginie
authors.initials: V
authors.lastname: Dulong
authors.forename: Didier
authors.initials: D
authors.lastname: Le Cerf
authors.forename: Luc
authors.initials: L
authors.lastname: Picton
authors.forename: Philippe
authors.initials: P
authors.lastname: Michaud
mesh_terms: D005685:Galactans / Q000737:chemistry*; D057446:Hydrodynamics; D055595:Mechanical Phenomena; D008968:Molecular Conformation; D008970:Molecular Weight; D012212:Rheology; D000461:Rhodophyta / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*
chemical_list: D005685:Galactans; D013431:Sulfates