Structural properties of colloidal complexes between condensed tannins and polysaccharide hyaluronan.
Interactions of plant tannins with polysaccharide hyaluronan are studied by means of light scattering and small-angle X-ray scattering (SAXS). In this paper, we show that (1) the tannin-polysaccharide complexes remain stable in colloidal suspension; (2) the masses and structures of colloidal tannin-polysaccharide objects depend on the tannin degree of polymerization; and (3) the densities of tannin-polysaccharide aggregates are about 7 times lower than the density of a single solvated polysaccharide molecule. Short tannins and polysaccharides are aggregated in loose oligomeric structures whose sizes are comparable to a single polysaccharide molecule. Tannins longer than 10 nm and polysaccharides are aggregated in larger microgel-like particles whose sizes exceed 200 nm.
Laboratoire Matière et Systèmes Complexes (MSC), UMR CNRS 7057, Université Paris Diderot - Paris 7, Bâtiment Condorcet, CC 7056, 75205 Paris Cedex 13, France.
Florent
F
Carn
Sylvain
S
Guyot
Alain
A
Baron
Javier
J
Pérez
Eric
E
Buhler
Dražen
D
Zanchi
D003102:Colloids / Q000737:chemistry* / Q000378:metabolism*; D006820:Hyaluronic Acid / Q000737:chemistry* / Q000378:metabolism*; D058105:Polymerization; D044945:Proanthocyanidins / Q000737:chemistry* / Q000378:metabolism*; D053838:Scattering, Small Angle; D014867:Water / Q000737:chemistry*
D003102:Colloids; D044945:Proanthocyanidins; D014867:Water; D006820:Hyaluronic Acid