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博落回属植物中苄基异喹啉类生物碱代谢组学研究
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摘要
苄基异喹啉类生物碱由于其显著药理活性备受全世界研究者的重视,这类生物碱在生物合成上都包含在具有同一起源的代谢网络中。本论文以富含苄基异喹啉类生物碱的博落回为研究对象,整合高通量分析技术和复杂网络研究方法对异喹啉类生物碱代谢进行了较为全面系统的研究。本文研究内容如下:
     1.基于化学分类学,植物代谢组学和苄基异喹啉类生物碱的次生代谢的基础上提出了苄基异喹啉类生物碱代谢组学概念。详细地研究了苄基异喹啉类生物碱代谢网络的结构,构建了描述苄基异喹啉类生物碱代谢网络的加权邻接矩阵。最后讨论其在苄基异喹啉类生物碱资源开发、化学分类学和道地药材等研究领域的意义。
     2.建立了同时分析博落回中血根碱、白屈菜红碱、原阿片碱、别隐品碱四种生物碱的HPLC/UV分析方法,考察了博落回中在代谢上存在转化关系的四中生物碱在生长期中的含量动态变化规律。
     3.针对目前生物碱分析中流动相体系与液质联用兼容性差的问题,综合考察了全氟羧酸和羧酸添加剂对生物碱在不同填料色谱柱上分离及对其质谱响应的影响。得到了高碳量色谱柱与甲酸水流动相的合理组合,建立了在分离和质谱响应上均达到了较好的效果的HPLC/DAD/ESI/MS分析方法。以此方法分析了博落回根部样品,并结合苄基异喹啉类生物碱代谢途径知识对博落回中苄基异喹啉类生物碱进行了初步鉴定。
     4.建立了用于初步鉴定生物碱的数据库,数据库包含了存在于代谢途径中所有生物碱的分子量、质谱特征、紫外特征和还原特征。运用前一章建立的HPLC/DAD/ESI/MS方法对博落回和小果博落回不同部位进行了分析,并将获得的数据与数据库中生物碱进行匹配初步鉴定了其中苄基异喹啉类中生物碱,结合苄基异喹啉类生物碱代谢网络对两种植物的苄基异喹啉类生物碱代谢特点进行比较。
Due to benzylisoquinoline alkaloids pharmacological activity, the researchers all over the world have paid much attention to it. All of these alkaloids are biosynthesized in the metabolism network which have the same origin. This paper uses Macleaya cordata (Willd.) R. Br., in which many benzylisoquinoline alkaloids have been isolated, as research object, and a more comprehensive and systematic research for benzylisoquinoline alkaloids metabolism is carried out by integrating high-throughput analysis technology and complex metabolic network research methods. The details are summarized as follows:
     1. The concept of benzylisoquinoline alkaloids metabonomics was proposed on the basis of plant chemotaxonomy, plant metabonomics and benzylisoquinoline alkaloids secondary metabolism. Structure of the benzylisoquinoline alkaloids metabolic network was studied in detail, and the weighted adjacent matrix was used to describe metabolism network, also its significance in the field of benzylisoquinoline alkaloids resource development, chemotaxonomy and authentic medicinal herbs was discussed.
     2. A high-performace liquid chromatographic method coupled with UV detector was developed to simultaneously analyze protopine, allocry-ptopine, sanguinarine and chelerythrine in M cordata (Willd.) R. Br., which have transforming relations. The proposed method was applied to determine dynamic changes of the four alkaloids in different parts of M cordata (Willd.) R. Br. during growing period.
     3. Given the poor compatibility between the mobile phase of the present system using for alkaloids analyzing, and HPLC/MS, we investigated the effect of perfluorinated carboxylic acid and carboxylic acid additive on the alkaloids separation in different column and mass spectrometry response in detail and a method of HPLC/DAD/ESI/MS was developed which the separation and mass spectrometry response can reach good results at the same time by the rational combination of high carbon content column and mobile phase with carboxylic acid, Combined with the knowledge of benzylisoquinoline alkaloids metabolic pathway, benzylisoquinoline alkaloids in M cordata ( Willd. ) R. Br. were identificated preliminaryly.
     4. The database which contains molecular weight, mass spectrometry features, UV features, as well as reduction characteristics of alkaloids in biosynthesis pathway, was established for data matching. We analyzed the different parts of M cordata (Willd.) R. Br. and M microcarpa (Maxim.) Fedde using the method proposed the previous chapter, identificated preliminaryly benzylisoquinoline alkaloids by matching the data obtained and compared the differences of benzylisoquinoline alkaloids metabolism between two species by combining with benzylisoquinoline alkaloids metabolic network.
引文
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