合欢皂苷J_(20)的结构鉴定

STRUCTURAL ELUCIDATION OF JULIBROSIDE J 20

目的：研究合欢皮的化学成分及活性。方法：用现代色谱法分离合欢皮皂苷，用化学和现代波谱法，主要是二维核磁共振技术鉴定结构。结果及结论：分离并鉴定了一个新三萜皂苷，结构为３Ｏ［βＤ吡喃木糖基（１→２）αＬ吡喃阿拉伯糖基（１→６）βＤ吡喃葡糖基］２１Ｏ｛（６Ｓ）２反式２羟甲基６甲基６ＯβＤ吡喃木糖基２，７辛二烯酰基｝金合欢酸２８ＯβＤ吡喃葡糖基（１→３）［αＬ呋喃阿拉伯糖基（１→４）］αＬ吡喃鼠李糖基（１→２）βＤ吡喃葡糖基酯，命名为合欢皂苷Ｊ２０（ＪｕｌｉｂｒｏｓｉｄｅＪ２０）。

AIM: To research the constituents and activities of Albizzia julibrissin . METHODS: The saponins were separated by using HPLC and the structures were identified on the basis of chemical and spectral analysis. RESULTS AND CONCLUSION: A new saponin was isolated and its structure was elucidated as 3 O [β D xylopyranosyl (1→2) α L arabinopyranosyl (1→6) β D glucopyranosyl] 21 O [(6S) 2 trans 2 hydroxymethyl 6 methyl 6 O β D xylopyranosyl 2,7 octadienoyl] acacic acid 28 O β D glucopyranosyl (1→3) [α L arabinofuranosyl (1→4)] α L rhamnopyranosyl (1→2) β D glucopyranosyl ester.