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1. (Article ID: 10568)
 
Colquhoun IJ, Ralet MC, Thibault JF, Faulds CB, Williamson G
Feruloylated oligosaccharides from cell-wall polysaccharides, Part II. Structure indentification of feruloylated oligosaccharides from sugar- beet pulp by NMR spectroscopy
Carbohydrate Research 263 (1994) 243-256
 

1D NMR (1H and 13C) and 2D NMR spectroscopy have been used to determine the structure of feruloylated oligosaccharides obtained by enzymic degradation or mild acid hydrolysis of sugar-beet pulp. Feruloylated oligosaccharides derived from pectic neutral side-chains containing arabinose or galactose residues were identified. In the feruloylated arabinose oligosaccharides, feruloyl groups were linked to 0-2 of l,-Araf residues. The structure of the feruloylated arabinose disaccharide was identified as 0-[2-0-(trans-feruloyl)-α-l-Ara f]-(1→5)-l-Araf and that of the feruloylated arabinose trisaccharide as O-α-l-Araf-(1→3)-O-[2-0-(trans-feruloyl)-α-l-Araf]-(1→5)-l-Araf. The structure of the feruloylated galactose disaccharide was identified as 0-[6-0-(trans-feruloyl)-β-d-Galp]-(1→4)-d-Galp. From our results, we suggest that the feruloyl groups present in sugar-beet pulp are linked to the arabinofuranosyl residues of the main core of α-(1→5)-linked arabinan chains and to the galactopyranosyl residues of the main core of β-(1→4)-linked type I galactan chains.

NMR, structure, ferulic acid, sugar-beet pulp

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