化学
阿拉伯糖
多糖
鼠李糖
阿拉伯半乳聚糖
水解
半乳糖
果胶
立体化学
生物化学
木糖
发酵
作者
Hideaki Yamada,Kyong-Soo Ra,Hiroaki Kiyohara,Jong‐Chol Cyong,Yasuo Otsuka
标识
DOI:10.1016/0008-6215(89)84098-4
摘要
An anti-complementary pectic polysaccharide (BR-2-IIb), isolated from the roots of Bupleurum falcatum L., has an average molecular weight of 36,000 (gel filtration), and was subjected to methylation analysis before and after carboxyl-reduction, digestion with endo-polygalacturonase, base-catalysed β-elimination, and partial acid hydrolysis. BR-2-IIb consisted mainly of galacturonic acid, arabinose, rhamnose, and galactose in the molar ratios 13.0:2.1:1.4:1.0 and contained a large enzyme-sensitive polygalacturonan region. The enzyme-resistant region (PG-1) was rich in neutral sugars and contained a backbone of 4-linked GalA and 2-linked Rha to which a highly branched arabinogalactan was attached to position 4 of some 2-linked Rha units. Partial acid hydrolysis of BR-2-IIb gave Ara-(1→3)-Ara, Ara-(1→4)-Arap, Ara-(1→5)-Araf, Ara-(1→6)-Gal, Gal-(1→4)-Gal, GalA-(1→2)-Rha, GalA-(1→4)-Rha, GalA→Rha→Rha, Gal→Rha→Rha, and GalA-(1→6)-Gal in addition to (1→4)linked oligogalacturonides. The anti-complementary activity of BR-2-IIb was enhanced by de-esterification, but carboxyl-reduction decreased the activity.
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