Galactans: an overview of their most important sourcing and applications as natural polysaccharides

Since last decades, lot of biological and rheological properties of polysaccharides and oligosaccharides were described. Among them, galactans and more especially sulfated galactans from seaweeds have shown interesting and specific properties not only as texturing agents but also as biological active compounds on several organisms. This class of polysaccharides includes classical sulfated galactans extracted from seaweeds and classified as agar and carrageenans. However, some galactans are more complex and their specific structural features have been characterized after their extraction from terrestrial plants, seaweeds but also animals and microoragnisms. This review catalogues the origins, structural characteristics and potentialities of these polysaccharides and their oligosaccharides derivatives

Oligosaccharides biologiquement actifs obtenus par dégradation enzymatique d’un arabinogalactane extrait de cladodes de Cereus triangularis

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Characterization of arabinogalactan-rich mucilage from Cereus triangularis cladodes

International audienceCereus triangularis (Cactaceae) is a cactus used in food decoction as a traditional medicine in the North region of Madagascar to reduce stomach ache and intestinal diseases. Hydrocolloids were sequentially extracted from its cladodes with a yield of 24% (240 mg/g based on dried cladodes powder). Structural analyses has revealed that this polysaccharide with a molecular mass of 8430,000 g/mol was mainly composed of a galactan backbone of a (1 → 4) linked β-d-Galp residues probably substituted at position 3 by l-arabinofuranosyl residues. In vitro antioxidant activity of this arabinogalactan-rich fraction was detected and quantified by radical DPPH scavenging, hydroxyl radical scavenging, radical anion superoxide scavenging and reducing power method

Bioactive polysaccharides from African terrestrial plants: the importance of ethnobotany

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Bioactive polysaccharides from African terrestrial plants: the importance of ethnobotany

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Structural characterization and physico-chemical potential of a heteroxylan extracted from Plantago notata Lagasca (Plantaginaceae) seeds

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