β-受体激动剂质谱裂解特征研究

Study on mass spectral characteristics of β-receptor agonists

关键词:  液相色谱-串联质谱法,β-受体激动剂,质谱裂解

Key words:  Liquid  chromatography-tandem  mass spectrometry, β-receptor  agonists, mass  spectral characteristics

摘要:

本研究以克伦特罗、莱克多巴胺、沙丁胺醇等为代表,阐明了β-受体激动剂在正离子软电离模式下的裂解机理。采用 AB SCIEX 5500 QTRAP 三重四级杆电喷雾质谱仪,运用IDA-EPI技术,对β-受体激动剂类化合物裂解规律进行研究解析。结果表明,在ESI正电离模式下β-受体激动剂容易获得H 而形成[M H] 准分子离子峰,该结构易丢失水分子(H₂O),继而与氨基结构相连的碳氮键(-C-N-)发生断裂,形成与苯环共轭的(Ph-CH=CH-NH -)离子结构。本研究为同类化合物的结构解析提供可靠依据,为跟踪新型β-受体激动剂提供有力手段,具有较强的理论意义和实用价值。

Abstract:

To clarify pyrolysis mechanism of β-receptor agonists under positive mode, representative drugs including clenbuterol, salbutamol and ractopamine had been chosen to study with AB SCIEX 5500 QTRAP triple quadrupole mass spectrometry and IDA-EPI technology. The results showed that under ESI positive mode, β-receptor agonists are easy to form [M H] . The structure is easy to loss neutral molecules, such as H₂O. Moreover, the C-N bond connected with amino group is easy to broken and produce conjugated ion structure with benzene. This study has important theory research significance and practical value, such as providing reliable basis for other β-receptor agonists structural analysis and providing powerful means to track new β-receptor agonists.