5种贝母药材的电喷雾离子阱质谱特征图谱研究  

ESI-MS characteristic spectra of alkaloids in Bulbus Fritillariae

作　　者：韩凤梅[1] 王新立[1] 蔡敏[1] 陈勇[1] 

机构地区：[1]湖北大学生命科学学院,湖北武汉430062

出　　处：《中草药》2005年第7期1069-1071,共3页Chinese Traditional and Herbal Drugs

基　　金：科技部十五攻关项目(2001BA701A01);湖北省青年杰出人才科学基金项目(2002AC004)

摘　　要：目的建立5种贝母药材的电喷雾离子阱质谱(ES I-M S)特征图谱,用于贝母药材的品种鉴别。方法用18%氨水润湿贝母药材,乙醚-氯仿-乙醇(25∶8∶2.5)混合溶剂超声提取其中贝母生物碱,将提取物直接进样到电喷雾离子阱质谱检测器进行正离子全扫描分析。结果在正离子一级质谱中,贝母生物碱易形成带一个正电荷的准分子离子,并且在中性醇溶液中,贝母生物碱易形成二聚体,在酸性介质中则无此现象;二级碰撞诱导解离易使贝母生物碱脱去一分子水;5种贝母对照药材的总生物碱提取液的一级电喷雾质谱图显示,主要分子离子峰基本相同,但因品种不同相对丰度差异较大。结论5种贝母药材生物碱提取物的ES I-M S图谱特征性较强,重现性与精密度较好,可用于不同品种贝母类药材的鉴别。Objective To develop the characteristic ESI-MS spectra of five Bulbus Fritillariae species and to be used for identification of Bulbus Fritillariae species.Methods The Bulbus Fritillariae medicinal materials were dipped in 18% ammonia solution,then the alkaloids were extracted by ultrasonic using the mixed solvent of ether-chloroform-ethanol(25∶8∶2.5).The extracts were analyzed directly by ESI-MS in positive ion mode.Results Bulbus alkaloids easily formed molecular ions(^+) in MS and dimerized easily in alcohol solution,which did not dimerize in acidity solution.Collision induced dissociation(S-CID) made these alkaloids easily lose a molecule of H_2O.The MS spectra of the extracts of five Bulbus Fritillariae species indicated that the major molecular ions were similar to each other,but different varieties showed very different relative abundances of these molecular ions.Conclusion The total alkaloid extracts of five Bulbus Fritillariae species have strong characteristic ESI-MS spectra and these spectra are of good reproducibility and precision,respectively.These characteristic spectra are useful for the identification of Bulbus Fritillariae species.

关 键 词：贝母 生物碱 电喷雾质谱 特征图谱 

分 类 号：R282.7[医药卫生—中药学]