贝母属植物异甾体生物碱的存在及其分类学意义

本文根据化学成分资料，探讨了百合科贝母属在植物化学分类上的指征，指出5α-cevanine类 异甾体生物碱为该属植物的特征性成分(Characteristic constituents)；从其生源上看，结构中的C13 与C17位应是其生物合成中氮源骈合的结合部位，即可产生C13、C17上双氢反式(如浙贝甲素 verticine、浙贝乙素verticinone)和顺式(如炉贝甲素delavine、松贝甲素songbeinine)两大类型的生 物碱。同时，作者分析了特征性成分在中国分布区内本属植物主要种中的存在状态，结果提示：其存在形式与其相应植物的形态、地理分布有—定的相关性，值得进—步加以深入研究。

The Existence of Isosteroidal Alkaloids in Fritillaria L.(Liliaceae) and Its Taxonomical Significance

 The plant chemotaxonomical marker of Fritillaria L. is discussed in this paper according to the information on chemical components. Plenty of evidence shows that 5α-cevanine isosteroidal alkaloids are the characteristic constituents of this genus. In the light of the biogensis of this kind of alkaloids, the C-13 and C- 17 of the molecular structures may be rational positions uniting a nitrogenous group in their biosyntheses which make two kinds of 5α-cevanine isosteroidal alkaloids,  the  dihydrogen  of C- 13  and  C- 17  being  at  the  state  of trans-configuration (e. g. verticine, verticinone) and at the state of cis- configuration (e.g. delavine, chuanbeinone and songbeinine). Meanwhile, this paper reports the existence and content of some 5α-cevanine isosteroidal alkaloids in main Chinese fritillarias.  This result reveals that there may be a relationship between the formation of characteristic constituents on one hand and other morphological characters and distribution of the plants concerned on the other,which encourages further investigation.