Mass Spectrometry Characterization of Peroxycarboxylic Acids as Proxies for Reactive Oxygen Species and Highly Oxygenated Molecules in Atmospheric Aerosols
作者:Sarah S. Steimer、Ivan Kourtchev、Markus Kalberer
DOI:10.1021/acs.analchem.6b04127
日期:2017.3.7
ionization and fragmentation behavior of peroxy acids in mass spectrometers. To study their fragmentation patterns, we synthesized 12 peroxy acids with C8 to C10 carbon backbones and mono- or diperoxy acid functionality. The peroxy acids were separated using liquid chromatography, detected via negative mode electrospray ionization high-resolution MS, and their fragmentation patterns (MS/MS spectra) were identified
大气气溶胶颗粒的很大一部分由有机材料组成,这些有机材料具有高度复杂但表征较差的成分。为了更好地了解大气中的气溶胶效应和过程,需要在分子水平上更详细地了解气溶胶成分。过氧酸由于其氧化特性,可能在颗粒毒性中起重要作用,最近发现它们与颗粒形成有关。由于缺乏适当的标准,过氧酸的鉴定和定量通常是高度不确定的。质谱(MS)是表征复杂混合物中未鉴定化合物的强大工具。但是,到目前为止,关于质谱仪中过氧酸的电离和碎片化行为的信息很少。8至C 10的碳主链和单或二过氧酸官能度。使用液相色谱法分离过氧酸,通过负模式电喷雾电离高分辨率质谱进行检测,并鉴定其片段化模式(MS / MS光谱)。过氧酸的MS / MS谱图显示出与相应酸明显不同的片段化模式,不同链长但具有相似官能团的化合物之间具有很强的相似性。CH 2 O 2的中性损失在所有研究的线性过氧酸中都观察到了α-烯烃,但对于羧酸却没有,因此可以用作过氧酸的诊断
Phosphorus protecting groups
申请人:Dellinger J. Douglas
公开号:US20070099859A1
公开(公告)日:2007-05-03
In certain embodiments of the invention, novel compositions having a phosphorus group and a phosphorus protecting group bound to the phosphorus group are provided, and methods of deprotecting the phosphorus group are provided.
In various embodiments of the invention, novel compositions having a polynucleotide bound to a substrate via a cleavable linker are provided, and methods of cleaving a polynucleotide from a substrate are provided.
Thioether substituted aryl carbonate protecting groups
申请人:Timar Zoltan
公开号:US20080146787A1
公开(公告)日:2008-06-19
Embodiments of the invention include thioether substituted aryl carbonate protecting groups, and nucleoside monomers protected with thioether substituted aryl carbonate protecting groups. Aspects of the invention further included methods of synthesizing nucleic acids, e.g., oligonucleotides, using such protected nucleoside monomer monomers, as well as nucleic acids produced using methods of the invention and compositions thereof.