Collision induced dissociations of non-derivatized and trimethylsilyl-derivatized estradiols: similarities in fragmentation patterns
作者:Yassin A. Jeilani、Huayang Li、Issifu I. Harruna、Khalid R. Alhooshani、Abdulaziz A. Al-Saadi
DOI:10.1002/jms.3529
日期:2015.2
Fragmentation mechanisms of estradiol and trimethylsilyl (TMS)-derivatized estradiol were studied by triple quadrupole tandem mass spectrometry (MSMS) and density functional theory (DFT) at B3LYP/6-311G(d,p) level. Collision induced dissociations (CID) of estradiol give product ions that are associated with the cleavage of B, C and D rings. Characteristic fragments from the cleavage of the aromatic ring A were not identified, and this was confirmed with both labeled estradiol and trimethylsilyl (TMS)-derivatized estradiol. The mechanisms are based on charge-site directed, radical-directed and charge remote fragmentations that are consistent with previous studies of steroids. CID spectra show ion pairs at m/z: 145/146, 157/158, 185/186, 211/213 and 225/226 with significant intensities, suggesting that these pairs are not from isotopic contributions. The mechanisms show similarities with some minor differences in the fragmentation patterns between the non-derivatized and the TMS-derivatized estradiol. Copyright © 2015 John Wiley & Sons, Ltd.
采用三重四极杆串联质谱 (MSMS) 和密度泛函理论 (DFT) 在 B3LYP/6-311G(d,p) 水平上研究了雌二醇和三甲基硅基 (TMS) 衍生雌二醇的裂解机制。雌二醇的碰撞诱导解离 (CID) 产生与 B、C 和 D 环裂解相关的产物离子。未鉴定出芳环 A 裂解产生的特征片段,这一点用标记的雌二醇和三甲基甲硅烷基 (TMS) 衍生的雌二醇都得到了证实。该机制基于电荷位点定向、自由基定向和电荷远程碎片,这与之前的类固醇研究一致。 CID 光谱显示 m/z:145/146、157/158、185/186、211/213 和 225/226 处的离子对具有显着强度,表明这些离子对不是来自同位素贡献。非衍生化雌二醇和 TMS 衍生化雌二醇之间的机制显示出相似性,但在碎片模式上存在一些细微差异。版权所有 © 2015 约翰·威利父子有限公司