Gracilaria gracilis (Gracilariales, ...
Document type :
Article dans une revue scientifique
DOI :
Permalink :
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]
Bhaby, Sanaa [Auteur]
Nadri, Amal [Auteur]
Khaya, Khaoulaa [Auteur]
Bentiss, Fouad [Auteur]
Jama, charafeddine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Reani, Abdeltif [Auteur]
Vasconcelos, Vitor [Auteur]
Sabour, Brahim [Auteur]
Bhaby, Sanaa [Auteur]
Nadri, Amal [Auteur]
Khaya, Khaoulaa [Auteur]
Bentiss, Fouad [Auteur]
Jama, charafeddine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Reani, Abdeltif [Auteur]
Vasconcelos, Vitor [Auteur]
Sabour, Brahim [Auteur]
Journal title :
Marine Drugs
Abbreviated title :
Marine Drugs
Volume number :
19
Pages :
672
Publisher :
MDPI AG
Publication date :
2021-11-26
ISSN :
1660-3397
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 >
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
Audience :
Non spécifiée
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Submission date :
2021-12-14T17:09:58Z