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Fucans from a Tunisian brown seaweed Cystoseira barbata: structural characteristics and antioxidant activity

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International Journal of Biological Macromolecules 66 (2014) 281–288

Fucans from a Tunisian brown seaweed Cystoseira barbata: Structural

characteristics and antioxidant activity

Sabrine Sellimia,∗, Nabil Kadrib, Veronique Barragan-Monterob, Hocine Laouerc, Mohamed Hajjia, Moncef Nasria

a Laboratoire de Génie Enzymatique et de Microbiologie, Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax, B.P. 1173, 3038 Sfax,

Tunisia

b Laboratoire de Glycochimie et Reconnaissance Moléculaire, UMR 5032, Université Montpellier II, ENSCM, 8, rue de

l’Ecole-Normale, 34296 Montpellier Cedex, France

c Laboratoire de Valorisation des Ressources Biologiques Naturelles, Faculté des Sciences Naturelles et de la Vie UFA, Sétif, Algeria

a r t i c l e i n f o

a b s t r a c t

Article history: Received 12 December 2013 Received in revised form 18 February 2014 Accepted 19 February 2014 Available online 28 February 2014 Keywords: Cystoseira barbata Fucans GC–MS 1 H-NMR ATR-FTIR Antioxidant activity

Sulfated polysaccharides from brown seaweeds are known to be a topic of numerous studies, due to their beneficial biological properties including antioxidant activity. Fucans were isolated from the brown sea- weed Cystoseira barbata harvested in Tunisia. ATR-FTIR and 1H-NMR spectroscopies demonstrated that

C. barbata sulfated polysaccharides (CBSPs) consisted mainly of

3-linked-a-l-fucopyranosyl backbone,

acetylated and mostly sulfated at C-4. Molar degrees of sulfation

and acetylation of CBSPs were 0.79 and 0.27, respectively.

Neutral sugars analysis determined by gas chromatography–mass

spectrometry (GC–MS) showed that CBSPs were mainly

composed of fucose (44.6%) and galactose (34.32%) with few amounts of other sugars such as glucose (7.55%), rhamnose

(6.41%), xylose (4.21%) and mannose (2.91%). CBSPs were

examined for in vitro antioxidant properties using various

antioxidant assays. CBSPs exhib- ited important DPPH

radical-scavenging activity (100% inhibition at a concentration of 1.5 mg/ml) and considerable ferric reducing potential (24.62 mg ascorbic acid equivalents). Effective chelating activity and significant protection activity against hydroxyl radical induced DNA breakage were also recorded for

CBSPs. However, in the linoleate-þ-carotene system, CBSPs

exerted moderate antioxidant activity (62%

inhibition at a concentration of 1.5 mg/ml). Therefore, CBSPs can

be used as a potent natural antioxidant in food industry or in the pharmaceutical field.

© 2014 Published by Elsevier B.V.

Contents lists available at ScienceDirect

International Journal of Biological Macromolecules

j ourna l h o mepa ge: www.elsevier.com/locate/ijbiomac

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