Structural Characterization and Rheological and Antioxidant Properties of Novel Polysaccharide from Calcareous Red Seaweed
oleh: Faiez Hentati, Latifa Tounsi, Guillaume Pierre, Mohamed Barkallah, Alina Violeta Ursu, Hajer Ben Hlima, Jacques Desbrières, Didier Le Cerf, Imen Fendri, Philippe Michaud, Slim Abdelkafi
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-08-01 |
Deskripsi
A novel sulfated xylogalactan (JASX) was extracted and purified from the rhodophyceae <i>Jania adhaerens</i>. JASX was characterized by chromatography (GC/MS-EI and SEC/MALLS) and spectroscopy (ATR-FTIR and <sup>1</sup>H/<sup>13</sup>C NMR) techniques. Results showed that JASX was constituted by repeating units of (→3)-β-<span style="font-variant: small-caps;">d</span>-Gal<i>p</i>-(1,4)-3,6-α-<span style="font-variant: small-caps;">l</span>-AnGal<i>p</i>-(1→)<sub>n</sub> and (→3)-β-<span style="font-variant: small-caps;">d</span>-Gal<i>p</i>-(1,4)-α-<span style="font-variant: small-caps;">l</span>-Gal<i>p</i>-(1→)<sub>n</sub> substituted on <i>O</i>-2 and <i>O</i>-3 of the α-(1,4)-<span style="font-variant: small-caps;">l</span>-Gal<i>p</i> units by methoxy and/or sulfate groups but also on <i>O</i>-6 of the β-(1,3)-<span style="font-variant: small-caps;">d</span>-Gal<i>p</i> mainly by β-xylosyl side chains and less by methoxy and/or sulfate groups. The M<sub>w</sub>, M<sub>n</sub>, Đ, [<i>η</i>] and C* of JASX were respectively 600 and 160 kDa, 3.7, 102 mL.g<sup>−1</sup> and 7.0 g.L<sup>−1</sup>. 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.