New 4-O-substituted xylosyl units in the xyloglucan from leaves of Hymenaea courbaril.
Int J Biol Macromol
; 35(5): 277-82, 2005 Jun.
Article
em En
| MEDLINE
| ID: mdl-15862867
ABSTRACT
A homogeneous fucogalactoxyloglucan, isolated from the leaves of Hymenaea courbaril, was analysed by methylation-GC-MS. These procedures involved derived partially O-methylated alditol acetates and acetylated aldononitriles, which demonstrated the presence of both 2-O- and 4-O-substituted Xylp units in the side-chains. The presence of the unusual, latter structure was confirmed by 2D NMR spectroscopy with a correlated HMQC C-4/H-4 signal at delta 77.8/3.73. A similar 4-O-substituted xylosyl structure was present in a decasaccharide Glc4Xyl3Gal2Fuc obtained via endo-glucanase treatment of the polysaccharide, which gave rise to a molecular ion with m/z 1555 (ESI-MS, Na+ form).
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Base de dados:
MEDLINE
Assunto principal:
Xilanos
/
Folhas de Planta
/
Glucanos
/
Fabaceae
Idioma:
En
Revista:
Int J Biol Macromol
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Brasil