Tandem mass spectrometry of bilin tetrapyrroles by electrospray ionization and collision-induced dissociation.

Tandem mass spectrometry of bilin tetrapyrroles by electrospray ionization and collision-induced dissociation.
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通过电喷雾电离和碰撞诱导解离对胆碱四吡咯进行串联质谱分析。

DOI:
10.1002/rcm.6287
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发表时间:
2012
期刊:
Rapid communications in mass spectrometry : RCM
影响因子:
--
通讯作者:
Wood,TroyD
Wood,TroyD
中科院分区:
--
文献类型:
--
作者:
Quinn,KevinD;Nguyen,NhuQT;Wach,MichaelM;Wood,TroyD

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生物素是宿主和细菌对卟啉的代谢产物,是健康状态和人类废物污染的标志。虽然胆色素串联质谱报告存在,其作为结构的函数的碎片行为还没有被比较,也没有碎片被检查作为碰撞energy. METHODS的函数的碰撞诱导解离(CID)检查正离子模式电喷雾电离产生的胆色素的碎片。比较了四极离子阱和傅里叶变换离子回旋共振(FT-ICR)质谱仪上的CID随碰撞能量的变化。甲酯化反应被用来推断哪些产物离子含有内吡咯环。FT‐ICR高质量精度测量用于确定所得产物离子的分子式。中心碳与内部吡咯环的键合影响碎裂。胆红素是独特的,因为碎片相邻的中心亚甲基之间的最内环占主导地位,和损失的终端吡咯观察到只有氦碰撞气体。其他的胆色素失去了终端pyrroles第一,作为CID能量增加,额外的碎片由于中性损失的小分子,如H2O,CO,CO2,和methanol occurs.CONCLUSIONSBased上这些意见,碎片方案的胆色素提出了强烈依赖于分子结构和碰撞能量,只有胆红素碎片的影响显着碰撞气体使用。该报告应具有鉴定这类分子用于生物标志物检测的价值。版权所有© 2012约翰威利父子有限公司.
RATIONALEBilins are metabolic products of hosts and bacteria on porphyrins, and are markers of health state and human waste contamination. Although bilin tandem mass spectrometry reports exist, their fragmentation behavior as a function of structure has not been compared, nor has fragmentation been examined as a function of collision energy.METHODSThe fragmentation of bilins generated by positive ion mode electrospray ionization is examined by collision‐induced dissociation (CID). CID on a quadrupole ion trap and on a Fourier transform ion cyclotron resonance (FT‐ICR) mass spectrometer as a function of collision energy is compared. Methyl esterification was used to deduce which product ions contain the inner pyrrole rings. FT‐ICR high mass accuracy measurements were used to determine the formulas of the resultant product ions.RESULTSThe central carbon's bonding to the inner pyrrole rings influences fragmentation. Bilirubin is unique because fragmentation adjacent to the central methylene group between innermost rings predominates, and loss of a terminal pyrrole is observed only with helium collision gas. The other bilins lose the terminal pyrroles first; as CID energy is increased, additional fragmentation due to neutral losses of small molecules such as H2O, CO, CO2, and methanol occurs.CONCLUSIONSBased on these observations, fragmentation schemes for the bilins are proposed that are strongly dependent on the molecular structure and collision energy; only bilirubin fragmentation is influenced significantly by the collision gas used. This report should have value in identification of this class of molecules for biomarker detection. Copyright © 2012 John Wiley & Sons, Ltd.
粗中胆红素原的氧化产物。
DOI: 10.1042/bj1170271
发表时间: 1970
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DOI: 10.1073/pnas.45.10.1476
发表时间: 1959
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DOI: 10.1016/0304-4165(72)90119-5
发表时间: 1972-01-01
期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
作者:
FAHMY, K;GRAY, CH;NICHOLSON, DC
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