Structural Characterization and Rheological and Antioxidant Properties of Novel Polysaccharide from Calcareous Red Seaweed

Faiez Hentati (1) , Latifa Tounsi , Guillaume Pierre (2) , Mohamed Barkallah , Alina Violeta Ursu , Hajer Ben Hlima , Jacques Desbrieres (3) , Didier Le Cerf (4, 5) , Imen Fendri , Philippe Michaud (2) , Slim Abdelkafi (6)

1 URAFPA - Unité de Recherches Animal et Fonctionnalités des Produits Animaux
2 INP Clermont Auvergne - Institut national polytechnique Clermont Auvergne
3 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
4 UNIROUEN - Université de Rouen Normandie
5 INC3M - Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire
6 Université de Sfax - University of Sfax

A novel sulfated xylogalactan (JASX) was extracted and purified from the rhodophyceae Jania adhaerens. JASX was characterized by chromatography (GC/MS-EI and SEC/MALLS) and spectroscopy (ATR-FTIR and 1H/13C NMR) techniques. Results showed that JASX was constituted by repeating units of (!3)-beta-D-Galp-(1,4)-3,6-alpha-L-AnGalp-(1!)n and (!3)-beta-D-Galp-(1,4)-alpha-L-Galp-(1!)n substituted on O-2 and O-3 of the alpha-(1,4)-L-Galp units by methoxy and/or sulfate groups but also on O-6 of the beta-(1,3)-D-Galp mainly by beta-xylosyl side chains and less by methoxy and/or sulfate groups. The Mw, Mn, Ð, [h] and C* of JASX were respectively 600 and 160 kDa, 3.7, 102 mL.g-1 and 7.0 g.L-1. JASX exhibited pseudoplastic behavior influenced by temperature and monovalent salts and highly correlated to the power-law model and the Arrhenius relationship. JASX presented thixotropic characteristics, a gel-like viscoelastic behavior and a great viscoelasticity character. JASX showed important antioxidant activities, outlining its potential as a natural additive to produce functional foods.

Keywords: structure; flow behavior; viscoelasticity; antioxidant activity

Domains: Chemical Sciences; Material chemistry; Chemical Sciences; Analytical chemistry; Chemical Sciences; Polymers; Chemical Sciences; Theoretical and/or physical chemistry

Faiez Hentati, Latifa Tounsi, Guillaume Pierre, Mohamed Barkallah, Alina Violeta Ursu, et al.. Structural Characterization and Rheological and Antioxidant Properties of Novel Polysaccharide from Calcareous Red Seaweed. Marine drugs, 2022, 20 (546), ⟨10.3390/md20090546⟩. ⟨hal-03807741⟩