金银花中水溶性化合物的分离与结构确定

Water Soluble Constituents From Japanese Honeysuckle(Lonicera japonica)

金银花的水溶性部位经大孔树脂柱层析，Rp－18HPLC柱层桥分得4个化合物，经FABMS，IDNMR和2DNMR谱的测定，确定3个三萜皂甙的结构为：3－O－α－L－吡喃鼠李糖基-（1→2）－α－L-吡喃阿拉伯糖基-hederagenin－28－O-β-D-吡喃木糖基-（1→6）-β-D-吡喃葡萄糖酯（I），3－O－α-L-吡喃阿拉伯糖基-hederagenin－28－O－α－L-吡喃鼠李糖基（1→2）-（β-D-吡喃木糖基-（1→6））-β-D-吡喃葡萄糖酯（Ⅱ）和3－O－α－L-吡喃鼠李糖基-（1→2）-α-L-吡喃阿拉伯糖基-hederagenin－28－O－α－L-吡喃鼠李糖基-（1→2）-（β-D-吡喃木糖基（1→6））-β-D-吡喃葡萄糖酯（Ⅲ）。另一化合物确定为绿原酸四乙酰化物（Ⅳ）。药理实验表明以上化合物对CCl4。引起的小鼠肝损伤有明显的保护作用。

From the water soluble extract of Flos Lonicera japonica Thunb.,three triterpenoid saponins were isolated. On the basis of detailed analysis of 1HNMR, 13CNMR, 1H-1HCOSY, HMBC, HMQC, FAB MS, their structures were decided as 3-O-α- L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl hederagenin 28-O-β-Dxylpyranosyl (1→6 )-β-D-glucopyranosyl ester (Ⅰ), 3-O-α-L-arabinopyranosyl hederagenin 28-O-α-L-rhamnopyranosyl (1→2) [β-D-xylpyranosyl (1→6)] -β-glucopyranosyl ester (Ⅱ) a nd 3-O-α-L-rhamnopyranosyl (1→2) -α-L-arabinopyranosyl hederagenin 28-O-α-L-rhamnopyranosyl (1→2)[β-D-xylpyranosyl (1→6)]β-D-glucopyranosyl ester（Ⅲ), and chlorogenin tetraacetate (Ⅳ). Pharmacological experiment showed thatthese compounds had cytoprotective effects against carbon tetrachloride induced hepatic injury.