水苏糖
棉子糖
四糖
石竹科
异核单量子相干光谱
立体化学
鹅肠草
化学
二维核磁共振波谱
糖苷
生物化学
植物
生物
多糖
蔗糖
杂草
作者
Mieke Vanhaecke,Wim Van den Ende,Eveline Lescrinier,Natalia Dyubankova
摘要
While classic raffinose family oligosaccharides (RFOs) such as raffinose and stachyose are common in plants, stachyose is absent in the Caryophyllaceae. Instead the tetrasaccharide lychnose α-d-Gal-(1→6)α-d-Glc-(1→2)β-d-Fru-(1→1)α-d-Gal can accumulate. Stellaria media, a representative member of this family, was used to isolate α-d-Gal-(1→6)-[α-d-Gal-(1→4)]α-d-Glc-(1→2)β-d-Fru-(1→1)α-d-Gal, a novel pentasaccharide with a lychnose backbone. Complete NMR characterization using COSY, HSQC, HSQC-TOCSY, HMBC, and NOESY experiments was performed to unequivocally resolve its structure. This is the first report of a natural compound containing a Gal α(1→4)Glc linkage. The trivial name stellariose is proposed for this new pentasaccharide.
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