title: High interaction alginate-hyaluronate associations by hyaluronate deacetylation for the preparation of efficient biomaterials.
abstract: The paper presents fundamental investigations of alginate-hyaluronate association with significant polymer interactions for preparation of efficient biomaterials. For this purpose, acetamide functions of hyaluronate were partly cleaved by hydrazine at high temperature, yielding amino groups accessible to carboxylic functions of the alginate chain. Alginate-hyaluronate association was studied both in dissolved state by rheological measurements and CD, and in the form of gel slabs prepared after calcium diffusion. Appreciable interaction between carboxylic groups of alginate and the released amino groups of hyaluronate was put into evidence by enhanced values of the viscosity of mixed solutions, and by assessment of the properties of the gel formed: moderate deacetylation allowed gels of improved hardness and viscosity. Nevertheless, high deacetylation was observed to hinder the gel formation by Ca(2+) complexation of alginate, by the significant competition of COOH-NH(2) association. Interaction between alginate and modified hyaluronate results in regular gel structure, with small cavities.
authors.affiliation: Physiopathologie et Pharmacologie Articulaires, UMR 7561 CNRS-UHP Nancy 1, and FR CNRS W0070, Faculté de Médecine, BP 184, 54505 Vandoeuvre les Nancy, France.
authors.forename: S
authors.initials: S
authors.lastname: Oerther
authors.forename: A C
authors.initials: AC
authors.lastname: Maurin
authors.forename: E
authors.initials: E
authors.lastname: Payan
authors.forename: P
authors.initials: P
authors.lastname: Hubert
authors.forename: F
authors.initials: F
authors.lastname: Lapicque
authors.forename: N
authors.initials: N
authors.lastname: Presle
authors.forename: J
authors.initials: J
authors.lastname: Dexheimer
authors.forename: P
authors.initials: P
authors.lastname: Netter
authors.forename: F
authors.initials: F
authors.lastname: Lapicque
mesh_terms: D000107:Acetylation; D000464:Alginates / Q000737:chemistry*; D001672:Biocompatible Materials / Q000302:isolation & purification*; D002942:Circular Dichroism; D005782:Gels; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D006820:Hyaluronic Acid / Q000737:chemistry*; D008854:Microscopy, Electron; D012212:Rheology
chemical_list: D000464:Alginates; D001672:Biocompatible Materials; D005782:Gels; D006603:Hexuronic Acids; D020723:Glucuronic Acid; D006820:Hyaluronic Acid