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Caractérisations structurales et propriétés rhéologiques des polysaccharides de deux algues marines tunisiennes : Cystoseira compressa et Jania adhaerens

Abstract : Cystoseira compressa and Jania adhaerens are two seaweeds widespread on the Tunisian coasts and were not exploited. They have been used as natural ingredients to produce new canned fish burgers prepared from minced fish of common barbel (Barbus barbus). In addition, this work led to the extraction of a fucoidan (CCF) and a sodium alginate (CCSA) as matrix polysaccharides of C. compressa. CCF (Mw=1.05 × 105 g/mol) was a sulfated (14.65%) heterogalactofucan composed of α-(1,3) and α-(1,4)-linked l-Fucp as main backbone, which could be branched (31.8%) in O-3 and O-4 positions by terminal monosaccharides and side chains. CCSA (Mw = 1 × 105 g/mol) was composed of 56% α-l-GulA (G) and 44% β-d-ManA (M) (M/G = 0.77). The CCSA linear backbone was constituted by 93% of homoblocks (FGG = 53% and FMM = 40%) and 6% of heteroblocks (FMG = 3% and FGM = 3%). Rheological and biological investigations showed that CCF and CCSA solutions exhibited shear-thinning and fluid-like viscoelastic behaviors with antioxidant properties. A sulfated xylogalactan-rich fraction (JSP) was extracted from J. adhaerens. JSP (Mw = 8.0 × 105 g/mol) was mainly constituted by the agaran disaccharidic repeating residues (→3)-β-d-Galp-(1,4)-α-l-Galp-(1→)n and (→3)-β-d-Galp-(1,4)-3,6-α-l-AnGalp-(1→)n mainly substituted on O-6 of (1,3)-β-d-Galp residues and in O-2 and O-3 positions of (1,4)-α-l-Galp residues by T-β-d-Xylp, methoxy and/or sulfate groups. JSP solutions displayed a shear-thinning behavior with a great viscoelasticity character, having weak gel properties.
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Submitted on : Tuesday, March 2, 2021 - 3:08:25 PM
Last modification on : Thursday, March 4, 2021 - 3:06:12 AM

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2020CLFAC003_HENTATI.pdf
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  • HAL Id : tel-03144914, version 2

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Faiez Hentati. Caractérisations structurales et propriétés rhéologiques des polysaccharides de deux algues marines tunisiennes : Cystoseira compressa et Jania adhaerens. Biologie végétale. Université Clermont Auvergne; Université de Sfax (Tunisie), 2020. Français. ⟨NNT : 2020CLFAC003⟩. ⟨tel-03144914v2⟩

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