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O-feruloylated, O-acetylated oligosaccharides as side-chains of grass xylans

O-feruloylated, O-acetylated oligosaccharides as side-chains of grass xylans,10.1016/S0031-9422(96)00648-6,Phytochemistry,Gundolf Wende,Stephen C. Fry

O-feruloylated, O-acetylated oligosaccharides as side-chains of grass xylans   (Citations: 19)
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Partial acid hydrolysis of cell wall material from Festuca arundinacea cell cultures yielded a novel O-feruloylated trisaccharide (3). Treatment of 3 with Driselase, which contains β- but not α-d-xylosidase, released xylose plus the known compound, β-d-xylopyranosyl-(1 → 2)-(5-O-feruloyl)-l-arabinose. Since 3 contained one NaIO4-resistant xylose residue, it was concluded to be β-d-xylopyranosyl-(1 → 3)-β-d-xylopyranosyl-(1 → 2)-(5-O-feruloyl)-l-arabinose. Partial acid hydrolysis of Festuca cell walls also yielded several higher-Mr feruloylated oligosaccharides, including a feruloylated pentasaccharide, 4 (sugar composition: Ara + Xyl2 + two non-pentose residues) and a feruloylated heptasaccharide, 5 (Ara + Xyl3 + three non-pentose residues). Compounds 4 and 5 were endogenously O-acetylated but 3 was not. Similar or identical compounds were found in hydrolysates of 20 additional species of the Gramineae. These products represent a series of complex side-chains which, in vivo, are attached via Araf residues to the parent xylan. Their possible biological roles are discussed.
Journal: Phytochemistry , vol. 44, no. 6, pp. 1011-1018, 1997
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