Structural characterization and antioxidant activity of water-soluble polysaccharides from the Tunisian brown seaweed Cystoseira compressa.
Carbohydr Polym
; 198: 589-600, 2018 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-30093038
ABSTRACT
A fucoidan (CCF) and a sodium alginate (CCSA) were extracted and purified from the Tunisian brown seaweed Cystoseira compressa. CCF was a highly sulfated heterogalactofucan composed of α-(1â3), α-(1â4)-linked l-Fucp as main backbone which could be highly branched (31.84%) at O-3 and O-4 positions of α-(1â4)-l-Fucp and α-(1â3)-l-Fucp by terminal monosaccharides and side chains such as terminal α-l-Fucp, terminal ß-d-Galp, ß-d-Galp-(1â3)-α-l-Fucp and ß-d-Galp-(1â4)-α-l-Fucp. The ratio of α-(1â3)/α-(1â4) linkages was estimated at 3.861. CCSA was characterized by HPAEC-PAD, GC/MS-EI, ATR-FTIR, and 1H-NMR. The M/G ratio was M/Gâ¯=â¯0.77, indicating that CCSA respectively contained 44% and 56% of mannuronic and guluronic acids. The values of FGG, FMM, FGM (or FMG) blocks as well as the parameter η were estimated. The two polysaccharides exhibited effective antioxidant activities by ferrous ion chelation, ferric ion reduction and DPPH radical-scavenging, outlining their potentials as natural additives.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polissacarídeos
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Alga Marinha
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Phaeophyceae
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Alginatos
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Antioxidantes
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Tunísia