Fragmentation mechanisms in mass spectrometry of organophosphorus compounds: implications for analysis in chemical weapons convention framework
作者:Hamid Saeidian、Mansour Sarabadani
DOI:10.1007/s13738-014-0563-y
日期:2015.6
Detection and identification of chemical warfare agents and their precursors/reaction products in various environmental matrices are important tasks which are considered in chemical weapons convention (CWC). 2-[(2-chloroethyl)(alkyl)amino]ethyl alkyl methylphosphonates I and N-alkyl bis(2-(alkoxy-methylphosphoryloxy)amines II are covered under schedule 2.B.4 of CWC and have structures closely related
Functionalized silicon compounds and methods for their synthesis and use
申请人:Affymetrix, Inc.
公开号:US20010021506A1
公开(公告)日:2001-09-13
Provided are functionalized silicon compounds and methods for their synthesis and use. The functionalized silicon compounds include at least one activated silicon group and at least one derivatizable functional group. Exemplary derivatizable functional groups include hydroxyl, amino, carboxyl and thiol, as well as modified forms thereof, such as activated or protected forms. The functionalized silicon compounds may be covalently attached to surfaces to form functionalized surfaces which may be used in a wide range of different applications. In one embodiment, the silicon compounds are attached to the surface of a substrate comprising silica, such as a glass substrate, to provide a functionalized surface on the substrate, to which molecules, including polypeptides and nucleic acids, may be attached. In one embodiment, after covalent attachment of a functionalized silicon compound to the surface of a solid silica substrate to form a functionalized coating on the substrate, an array of nucleic acids may be covalently attached to the substrate. Thus, the method permits the formation of high density arrays of nucleic acids immobilized on a substrate, which may be used, for example, in conducting high volume nucleic acid hybridization assays.
The mass spectral studies of these silyl derivatives of pHpNMs were performed using GC/MS/MS in both electron ionization (EI) and chemical ionization (CI) mode. RESULTS Various approaches have been proposed to assess the fragmentation pathways of the trimethylsilyl (TMS) and tert-butyldimethylsilyl (TBDMS) derivatives of pHpNMs. All the proposed fragmentation pathways were based on the product and/or
理由芥菜(NMs)是化学战剂的发泡剂。从《化学武器公约》的角度来看,氮芥子(PHpNMs)的部分水解产物被视为氮芥子暴露的重要标志。从生物或环境样品中检测pHpNMs对于获得暴露于NMs的法医证据非常有用。方法气相色谱与串联质谱联用(GC / MS / MS)是广泛用于鉴定和灵敏检测复杂基质中NMs代谢物的工具。pHpNMs使用甲硅烷基化试剂衍生化,因为它们具有高极性且不适合GC。使用GC / MS / MS在电子电离(EI)和化学电离(CI)模式下对pHpNMs的这些甲硅烷基衍生物进行了质谱研究。结果已提出了各种方法来评估pHpNMs的三甲基甲硅烷基(TMS)和叔丁基二甲基甲硅烷基(TBDMS)衍生物的裂解途径。所有建议的裂解途径均基于EI和CI模式下相应离子的产物和/或前体离子扫描。对于EI,大多数断裂途径涉及α裂解或诱导裂解。结论这是有关pHpNMs的甲硅烷基衍生物的质谱研究的第一份
Mass spectral fragmentation of perfluoroacyl derivatives of half nitrogen mustards for their detection by gas chromatography/mass spectrometry
was generated by performing gaschromatography/electron ionization massspectrometry (GC/EI-MS) and gaschromatography/positive chemical ionization massspectrometry (GC/PCI-MS). The fragmentation pathways were studied by tandem massspectrometry (MS/MS) in both EI and PCI mode. RESULTS The EI-MS spectra of the TFA and HFB derivatives of halfNMs contain intense molecular ions and fragment ions, thus