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ESI-IT-TOF-MS^n方法对11个异黄酮的裂解规律研究(英文)    

Investigations of the fragmentation behavior of 11 isoflavones with ESI-IT-TOF-MS^n

文献类型:期刊文献

中文题名:ESI-IT-TOF-MS^n方法对11个异黄酮的裂解规律研究(英文)

英文题名:Investigations of the fragmentation behavior of 11 isoflavones with ESI-IT-TOF-MS^n

作者:张亚洲 徐风 易涛 张建业 汤依娜 许军 彭宛龄 陈虎彪

第一作者:张亚洲

机构:[1]香港浸会大学中医药学院;[2]贵州理工学院制药工程学院;[3]北京大学医学部天然及仿生药物国家重点实验室

第一机构:香港浸会大学中医药学院,香港九龙塘999077

年份:2014

卷号:0

期号:9

起止页码:631-641

中文期刊名:中国药学:英文版

收录:CSTPCD;;Scopus;CSCD:【CSCD2013_2014】;

基金:Hong Kong Baptist University Faculty Research Foundation(Grant No.FRG2/12-13/058);the Key Program of Guangxi Natural Science Foundation of China(Grant No.2013-GXNSFBA019187)

语种:中文

中文关键词:异黄酮;裂解规律;高分辨多级质谱技术

外文关键词:Isoflavone, Fragmentation behavior, ESI-IT-TOF-MSn

摘要:本文对选定的11个异黄酮化合物在ESI-IT-TOF-MS n的裂解规律进行研究。文章采用ESI-IT-TOF-MS n仪对样品进行高分辨质谱测定,正负离子多级切换,通过对质谱碎片离子进行预测,并根据结构对其质谱可能的裂解规律进行总结研究。由于在正离子模式下信号较强,采用正离子模式对11个异黄酮多级碎片离子分析,发现异黄酮苷的裂解主是优先断裂糖苷键?C环4位羰基易于中性丢失CO(–28),而C环经过RDA裂解形成的A 1,3+则能够比较A环与B环上的羟基取代位置?A环上有相邻羟基存在时,也易中性丢失CO(–28)或H2O(–18)?B环有甲氧基取代时中性丢失CH4(–16)、自由基(CH3)或CH3OH(–32)为常见,但A环与B环有单独羟基时也偶见中性丢失CO(–28)。通过ESI-IT-TOF-MS n方法,选定多级正离子模式下对异黄酮的裂解进行了总结,有利于了解异黄酮在质谱中的裂解行为,对于异黄酮类化合物相关的结构推测有重要意义。
The fragmentation behavior of isoflavones was studied using electrospray ionization-ion trap-time of flight mass spectrometry (ESI-IT-TOF-MSn). It was found that the isoflavone glycoside bond was easily broken. The fragmentation occurred mostly on the C-ring, and the fragment ions of A^1,3+ produced by the RDA cracking will predict the hydroxylation replacement on A-ring or B-ring. In addition, four carbonyl groups on the C-ring were fragmented through neutral loss of 28 (-CO). A and B-rings primarily lose substituents which including a neutral losses of 32 (-CH3OH), 16 (-CH4), or 16 (-O), and 18 (-H2O). A-ring in the presence of adjacent hydroxylation, also easily made to be a neutral losses of 28 (-CO) or 18 (-H20). It is likewise common to see methoxy replaced with a neutral losses of 16 (-CH4) or 32 (-CHaOH) in B-ring, also the hydroxylation on benzene ring can occasionally results with the neutral loss of 28 (-CO).

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