Titre :

Isolation and Structural Characterization of Alginates from the Kelp Species Laminaria ochroleuca and Saccorhiza polyschides from the Atlantic Coast of Morocco

Auteur(s) :

Kaidi, Soukaina [Auteur]
Université Chouaib Doukkali [UCD]
Bentiss, Fouad [Auteur]
Université Chouaib Doukkali [UCD]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Jama, charafeddine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Khaya, Khaoula [Auteur]
Université Chouaib Doukkali [UCD]
Belattmania, Zahira [Auteur]
Université Chouaib Doukkali [UCD]
Reani, Abdeltif [Auteur]
Université Chouaib Doukkali [UCD]
Sabour, Brahim [Auteur]
Université Chouaib Doukkali [UCD]

Titre de la revue :

Colloids and Interfaces

Nom court de la revue :

Colloids and Interfaces

Numéro :

6

Pagination :

51

Éditeur :

MDPI AG

Date de publication :

2022-09-27

ISSN :

2504-5377

Mot(s)-clé(s) en anglais :

kelps
Laminaria ochroleuca
Saccorhiza polyschides
alginates
1H NMR
FT-IR
viscosity

Discipline(s) HAL :

Chimie/Matériaux

Résumé en anglais : [en]

Alginates are linear unbranched polysaccharides produced by brown seaweeds. The gel properties of this phycocolloid are mainly linked to the monomer composition, sequential structure and molecular weight of the polymeric ...
Lire la suite >Alginates are linear unbranched polysaccharides produced by brown seaweeds. The gel properties of this phycocolloid are mainly linked to the monomer composition, sequential structure and molecular weight of the polymeric chain. Nevertheless, these structural parameters are also dependent on the age and tissue of the thalli used. In this work, the kelp species Laminaria ochroleuca and Saccorhiza polyschides harvested from the Moroccan coast were analyzed for their alginates content and composition in different thalli parts (blade and stipe). Spectroscopic characterization (1H NMR and FT-IR), viscosity, and molecular weight of the extracted alginates were investigated. The obtained results showed that the alginate contents ranged from 20.19 ± 2 to 49.8 ± 2.4% dw. FT-IR spectroscopy exhibited similar spectra between the alginates extracted from both species and the commercial alginate. The 1H-NMR results revealed interesting variations in block composition between species, and less disparity with regard to the tissue type (M/G values ranging from 0.89 to 2.14). High mannuronate content was found in all alginates except for those extracted from the blade of L. ochroleuca. The homopolymeric fractions FMM are remarkably high compared to the FGG and heteropolymeric fractions (FGM/FMG) in S. polyschides. However, for L. ochroleuca, the heteropolymeric fractions are quite abundant, accounting for more than 34% of the polymer diads. The alginates extracted from both species indicated low values for the intrinsic viscosity. Based on the yield and the structural properties of their alginates, this study suggests that both L. ochroleuca and S.polyschides could be considered potential alginophytes to be incorporated into the industry of alginates. It also proposes an optimization of the yield, using the different thalli parts in the extraction (blade and stipe). The chemical structure and viscosity of their alginates may contribute to expanding their applications, especially in biotechnology and medical fields.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Procédés de Recyclage et de Fonctionnalisation (PReF)

Date de dépôt :

2022-11-04T14:20:14Z
2022-11-08T12:41:28Z