LC-MSn比较分析三种传统中草药中绿原酸及其衍生物组分

摘要

利用LC-MSn分析了杜仲叶、金银花叶以及鱼腥草叶甲醇提取物中绿原酸及其异构体和衍生物.发现3种样品中都含有3种单咖啡酰奎尼酸(绿原酸), 分别是3-咖啡酰奎尼酸(3-caffeoylquinic acid,3-CQA)、 4-CQA和5-CQA.杜仲叶和金银花叶中5-CQA为主要成分,但鱼腥草叶中以3-CQA和4-CQA为主要成分.在杜仲叶中首次发现咖啡酰奎尼酸糖苷;另外还发现金银花叶中有少量5-阿魏酰奎尼酸(5-feruloylquinic acid,5-FQA);鱼腥草叶含有少量的3-FQA和4-肉桂酰奎尼酸(4-p-coumaroylquinic acid,4-pCoQA).本文首次报道鱼腥草叶中绿原酸异构体成分,为3-CQA和4-CQA的开发提供了来源(植物中绿原酸的结构一般以5-CQA为主).%To investigate the chlorogenic acids resources in Eucommia ulmoides Olive leaves, Lonicera japonica Thunb. leaves and Houttuynla cordata Thunb. leaves, methanolic extracts of these three materials have been analysed qualitatively for chlorogenic acids and their derivatives by structure-diagnostic LC-MSn. Three monocaffeoylquinic acids (3-CQA, 4-CQA, 5-CQA) were detected. 5-CQA dominated this subgroup in Eucommia ulmoides Olive and Lonicera japonica Thunb. leaves, but 3-CQA and 4-CQA dominated this subgroup of chlorogenic acids in the leaves of Houttuynla cordata Thunb. Caffeoylquinic acid-glycosides were detected for the first time from Eucommia ulmoides leaves. 5-FQA was found in Lonicera japonica Thunb. leaves, and 3-FQA and 4-pCoQA have been identified in Houttuynla cordata Thunb. This is the first report of the chlorogenic acid profile in Houttuynla cordata Thunb. The comparatively unusual profile of caffeoylquinic acids in Houttuynla cordata Thunb. makes it a convenient source of 3-CQA and 4-CQA that are not commercially available.