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Rhamnoarabinosyl and rhamnoarabinoarabinosyl side chains as structural features of coffee arabinogalactans
- Source :
-
Phytochemistry . May2008, Vol. 69 Issue 7, p1573-1585. 13p. - Publication Year :
- 2008
-
Abstract
- Abstract: The hot water soluble green coffee arabinogalactans, representing nearly 7% of total coffee bean arabinogalactans, were characterized by 1H and 13C NMR and, after partial acid hydrolysis, by ESI-MS/MS. Data obtained showed that these are highly branched type II arabinogalactans covalently linked to proteins (AGP), with a protein moiety containing 10% of 4-hydroxyproline residues. They possess a β-(1→3)-Galp/β-(1→3,6)-Galp ratio of 0.80, with a sugars composition of Rha:Ara:Gal of 0.25:1.0:1.5, and containing 2mol% of glucuronic acid residues. Beyond the occurrence of single α-l-Araf residues and [α-l-Araf-(1→5)-α-l-Araf-(1→] disaccharide residues as side chains, these AGPs contain unusual side chains at O-3 position of the β-(1→6)-linked galactopyranosyl residues composed by [α-l-Rhap-(1→5)-α-l-Araf-(1→] and [α-l-Rhap-(1→5)-α-l-Araf-(1→5)-α-l-Araf-(1→] oligosaccharides. Rhamnoarabinosyl and rhamnoarabinoarabinosyl side chains are reported for the first time as structural features of plant arabinogalactan-proteins. [Copyright &y& Elsevier]
- Subjects :
- *RUBIACEAE
*GENTIANALES
*NEOLAMARCKIA
*ARCYTOPHYLLUM
Subjects
Details
- Language :
- English
- ISSN :
- 00319422
- Volume :
- 69
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Phytochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 31754397
- Full Text :
- https://doi.org/10.1016/j.phytochem.2008.01.021