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Fragmentation Study of Limonoids from Turraae pubescens by Electrospray Ionization Quadrupole Time-of-flight Mass Spectrometry

文献类型： 外文期刊

作者： Xu, Xu 2 ; Cai, Tian 1 ; Xie, Ke-Xin 2 ; Hou, Xue 4 ; Xu, Xiao-Ying 1 ; Jiang, Yan 2 ; Wu, Zhi-Jun 2 ;

作者机构： 1.Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu, Sichuan, Peoples R China

2.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Sichuan, Peoples R China

3.Univ Chinese Acad Sci, Beijing, Peoples R China

4.Sichuan Acad Agr Sci, Ctr Anal & Testing, Chengdu, Sichuan, Peoples R China

5.Minist Agr, Lab Qual & Safety Risk Assessment Agroprod Chengd, Chengdu, Sichuan, Peoples R China

关键词： Electrospray ionization quadrupole time-of-flight tandem mass spectrometry (ESI-QTOF-MS/MS);limonoids;McLafferty-type rearrangement;Turraae pubescens

期刊名称：ANALYTICAL LETTERS （ 影响因子：2.329； 五年影响因子：1.738 ）

ISSN： 0003-2719

年卷期： 2017 年 50 卷 18 期

页码：

收录情况： SCI

摘要： Nine representative limonoids isolated from Turraae pubescens were investigated by electrospray ionization quadrupole time-of-flight tandem mass spectrometry in positive ion mode. Although the structures of these compounds are similar, the corresponding fragmentation patterns and mass spectrometry and tandem mass spectrometry (MS/MS) spectra are clearly different. For Turrapubin A-C, product ions can be detected in both low and high mass ranges. A McLafferty-type rearrangement is the only way for the cleavage of C9-C10. For 11-epi-toonacilin, Turrapubin E, Turraflorin A, 11-epi-23-hydroxytoonacilide, Turrapubin H and 11-epi-21-hydroxytoonacilide, the cleavage of C9-C10 goes through two different ways, including McLafferty-type rearrangement and homolytic cleavage. The relative abundances of product ions from McLafferty-type rearrangement for 11-epi-toonacilin, 11-epi-23-hydroxytoonacilide, and Turrapubin H are high, while those for Turrapubin E, Turraflorin A, and 11-epi-21-hydroxytoonacilide are low. A pair of epimers was distinguished unambiguously by MS/MS spectra. It was found that the substituent group at C-1, hydroxy group, O atom linked to C-14 and C-15, and the oxygenated furan ring were the important factors leading to the differences of their MS/MS spectra.

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