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Structural characterization of polyethers using matrix-assisted laser desorption/ionization quadrupole ion trap time-of-flight mass spectrometry

机译:基质辅助激光解吸/电离四极杆离子阱飞行时间质谱法对聚醚的结构表征

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摘要

Fragmentation of polyethers, such as poly(ethylene glycol) (PEG), poly(propylene glycol) and poly(tetramethylene glycol) was analyzed by matrix-assisted laser desorption/ionization tandem mass spectrometry (MALDI-MS/MS) using a quadrupole ion trap time-of-flight mass spectrometer (QIT-ToF). The Li adduct ion provided more abundant fragments than the Na and K adduct ions in the MS/MS spectra. A previous study had demonstrated four series fragments of hydroxyl-, vinyl- and formyl-terminated ions, as well as distonic cations, in high-energy fast atom bombardment MS/MS and MALDI collision-induced dissociation measurements of poly(ethylene glycol). In the present study, the low-energy MS/MS measurements using MALDI-QIT-ToF, showed hydroxyl-, vinyl- and formyl-terminated fragments with or without other fragment groups, but not distonic cations. The fragmentation depended on the types of polyethers examined. MS/MS measurements using MALDI-QIT-ToF are expected to allow structural characterization of unknown components of polyethers.
机译:通过使用四极离子的基质辅助激光解吸/电离串联质谱(MALDI-MS / MS)分析聚醚(例如聚乙二醇(PEG),聚丙二醇和聚丁二醇)的裂解阱飞行时间质谱仪(QIT-ToF)。在MS / MS谱图中,Li加合物离子提供的碎片比Na和K加合物离子丰富。先前的研究已经证明,在高能快速原子轰击MS / MS和MALDI碰撞诱导的聚乙二醇解离测量中,羟基,乙烯基和甲酰基封端的离子以及二甲苯磺酸阳离子的四个系列片段。在本研究中,使用MALDI-QIT-ToF进行的低能MS / MS测量显示,羟基末端,乙烯基末端和甲酰基末端的片段带有或不带有其他片段基团,但没有二歧阳离子。断裂取决于所检查的聚醚的类型。使用MALDI-QIT-ToF的MS / MS测量有望实现聚醚未知组分的结构表征。

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