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从中药川续断根部的乙醇提取物中分得1个新的三萜皂苷,经过测定,其结构为:3-O-α-L-吡喃鼠李糖(1→3)-β-D-吡喃葡萄糖(1→3)-β-L-吡喃鼠李糖(1→2)-β-L-吡喃阿拉伯糖-常春藤苷元(1).研究表明,采用一维SEMDY和三照射NOE差谱NMR新技术相结合能以“拼凑”方式测定糖链结构.方法简便、快速,测定结果可靠,重叠的信号可以指认,并且对样品不必进行化学降解或衍生化.本方法也可用于其他类型的寡糖结构测定.
A new triterpene saponin was isolated from the ethanol extract of Radix Chuanxiong. The structure was determined as follows: 3-O-α-L-rhamnopyranosyl (1 → 3) -β-D (1 → 3) -β-L-rhamnopyranosyl (1 → 2) -β-L-arabinofuranosyl-ivy aglycone (1) .The results showed that the one-dimensional SEMDY and The combination of the three new NOE differential spectroscopy NMR techniques allows for the determination of the sugar chain structure in a “patchwork” manner which is simple, rapid, reliable in assay results and allows overlapping signals to be identified without the need for chemical degradation or derivatisation of the sample. Can be used for other types of oligosaccharide structure determination.