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Caractérisation structurale et potentiel biologique des polysaccharides issus de Plantago notata Lagasca (Plantaginaceae) et Urginea noctiflora Batt.Trab (Liliaceae)

Abstract : The study of polysaccharides of Plantago notata Lagasca (Plantaginaceae) and Urginea noctiflora Batt. and Trab (Liliaceae), two spontaneous medicinal plants harvested from East Septentrional Algerian Sahara, allowed to isolate several hydro-and alkali-soluble polysaccharides fractions. Chemical composition analyses of these fractions showed that P.notata seeds extract was the fraction that have the highest neutral sugars composition (85.55%). In this study we have defined an extraction procedure to collect water-soluble polysaccharides and characterized their structure, prior to investigate their physico-chemical properties and biological activities. Structural analyses have revealed that P.notata polysaccharide is a heteroxylan with a backbone composed of β-(1,3)-d-Xylpand β-(1,4)-d-Xylp. The backbone might be highly branched, through O-2 and O-3 positions of β-(1,4)-d-Xylp by various side chains and terminal monosaccharides such as α-l-Araf-(1,3)-β-d-Xylp, β-d-Xylp-(1,2)-β-d-Xylp, T-Xylp or T-Araf. The physico-chemical analysis of this polysaccharide in dilute and semi- diluted regimes showed that this heteroxylan exhibited a molecular weight of 2.3 x 106 g/mol and a pseudoplastic behavior. The use of the digestibility of this heteroxylan has led to the production of a non-digestible polymer with prebiotic properties.
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Fatima Benaoun. Caractérisation structurale et potentiel biologique des polysaccharides issus de Plantago notata Lagasca (Plantaginaceae) et Urginea noctiflora Batt.Trab (Liliaceae). Santé. Université Clermont Auvergne, 2017. Français. ⟨NNT : 2017CLFAC050⟩. ⟨tel-01791341⟩

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