Title :

Gracilaria gracilis (Gracilariales, Rhodophyta) from Dakhla (Southern Moroccan Atlantic Coast) as Source of Agar: Content, Chemical Characteristics, and Gelling Properties

Author(s) :

Belattmania, Zahira [Auteur]
Université Chouaib Doukkali [UCD]
Bhaby, Sanaa [Auteur]
Nadri, Amal [Auteur]
Université Chouaib Doukkali [UCD]
Khaya, Khaoulaa [Auteur]
Bentiss, Fouad [Auteur]
Jama, charafeddine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Reani, Abdeltif [Auteur]
Université Chouaib Doukkali [UCD]
Vasconcelos, Vitor [Auteur]
Faculdade de Ciências da Universidade do Porto [FCUP]
Interdisciplinary Centre of Marine and Environmental Research [Matosinhos, Portugal] [CIIMAR]
Sabour, Brahim [Auteur]
Université Chouaib Doukkali [UCD]
Bentiss, Fouad [Auteur]

Journal title :

Marine Drugs

Abbreviated title :

Marine Drugs

Volume number :

19

Pages :

672

Publisher :

MDPI AG

Publication date :

2021-11-26

Article status :

Publié

ISSN :

1660-3397

English keyword(s) :

Gracilaria gracilis
agar quality
spectroscopic characterization
gel properties

HAL domain(s) :

Chimie/Matériaux
Chimie/Polymères

English abstract : [en]

Agar is a sulfated polysaccharide extracted from certain marine red algae, and its gel properties depend on the seaweed source and extraction conditions. In the present study, the seaweed Gracilaria gracilis (Gracilariales, ...
Show more >Agar is a sulfated polysaccharide extracted from certain marine red algae, and its gel properties depend on the seaweed source and extraction conditions. In the present study, the seaweed Gracilaria gracilis (Gracilariales, Rhodophyta) from Dakhla (Moroccan Atlantic Coast) was investigated for its agar content, structure, and gel properties. The agar yields of G. gracilis were 20.5% and 15.6% from alkaline pretreatment and native extraction, respectively. Agar with alkaline pretreatment showed a better gelling property supported by higher gel strength (377 g·cm−2), gelling (35.4 °C), and melting (82.1 °C) temperatures with a notable increase in 3,6-anhydro-galactose (11.85%) and decrease in sulphate (0.32%) contents. The sulfate falling subsequent to alkaline pretreatment was verified through FT-IR spectroscopy. The 13C NMR spectroscopy showed that alkaline-pretreated agar has a typical unsubstituted agar pattern. However, native agar had a partially methylated agarose structure. Overall, this study suggested the possibility of the exploitation of G. gracilis to produce a fine-quality agar. Yet, further investigation may need to determine the seasonal variability of this biopolymer according to the life cycle of G. gracilis.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Ingénierie des Systèmes Polymères

Submission date :

2021-12-14T17:09:58Z
2021-12-15T08:18:15Z