腰果渗出物中单核、寡糖和多糖结构的相似性。

Similarity of monosaccharide, oligosaccharide and polysaccharide structures in gum exudate of Anacardium occidentale.

作者信息

Menestrina J M, Iacomini M, Jones C, Gorin P A

机构信息

Departamento de Bioquímica, Universidade Federal do Paraná, Curitiba-PR, Brazil.

出版信息

Phytochemistry. 1998 Mar;47(5):715-21. doi: 10.1016/s0031-9422(97)00666-3.

DOI:10.1016/s0031-9422(97)00666-3

PMID:9542167

Abstract

The gum exudate from the Brazilian cashew-nut tree (Anacardium occidentale) contained traces of the reducing sugars, rhamnose (0.005%), arabinose (0.03%), mannose (0.007%), galactose (0.03%), glucose (0.02%), beta-D-Galp-(1-->6)-alpha beta-D-Gal (0.05%), alpha-L-Rhap-(1-->4)-alpha beta-D-GlcA (0.008%) and alpha-L-Rhap-(1-->4)-beta-D-GlcpA-(1-->6)-beta-D-Galp-(1-->6 )-alpha beta-D-Gal (0.008%). Rhamnose, arabinose, glucose and the three oligosaccharides are components of the side-chains of the gum polysaccharide, which has a main chain of (1-->3)-linked beta-D-Galp units. The structure of this polysaccharide was determined and found to differ from that previously reported for the gum of a tree growing in India, lacking units of 4-O-methylglucuronic acid. Other new side-chain structures were characterized, particularly -alpha-D-Galp-(1-->6)-D-Galp- and alpha-L-Araf-(1-->6)-D-Galp-).

摘要

巴西腰果（槚如树）的树胶渗出物含有痕量的还原糖，即鼠李糖（0.005%）、阿拉伯糖（0.03%）、甘露糖（0.007%）、半乳糖（0.03%）、葡萄糖（0.02%）、β-D-半乳糖基-(1→6)-αβ-D-半乳糖（0.05%）、α-L-鼠李糖基-(1→4)-αβ-D-葡糖醛酸（0.008%）和α-L-鼠李糖基-(1→4)-β-D-葡糖醛酸基-(1→6)-β-D-半乳糖基-(1→6)-αβ-D-半乳糖（0.008%）。鼠李糖、阿拉伯糖、葡萄糖和三种寡糖是树胶多糖侧链的组成成分，该多糖的主链由(1→3)-连接的β-D-半乳糖单元构成。已确定该多糖的结构，发现其与先前报道的生长在印度的一种树的树胶结构不同，缺少4-O-甲基葡糖醛酸单元。还对其他新的侧链结构进行了表征，特别是-α-D-半乳糖基-(1→6)-D-半乳糖-和α-L-阿拉伯糖基-(1→6)-D-半乳糖-。