Development of Submillisecond Time-Resolved Mass Spectrometry Using Desorption Electrospray Ionization
作者:Zhixin Miao、Hao Chen、Pengyuan Liu、Yan Liu
DOI:10.1021/ac200842e
日期:2011.6.1
Reaction kinetics studied by massspectrometry (MS) has previously been limited to millisecond time resolution. This paper presents the development of a submillisecond time-resolved mass spectrometric method for fast reaction kinetic study, based on the capability of desorption electrospray ionization (DESI) for direct and fast ionization of a high-speed liquid jet stream. The principle underlying
TlProR at 2.7 Å resolution. Of note, a substrate proline molecule, derived from expression host Escherichiacoli cells, was tightly bound in the active site of TlProR. The substrate bound structure and mutational analyses suggested that Trp241 is involved in hydroxyproline recognition by making a hydrogen bond between the indole group of Trp241 and the hydroxyl group of hydroxyproline. Additionally, Tyr171
Multistage Reactive Transmission-Mode Desorption Electrospray Ionization Mass Spectrometry
作者:Kevin C. Peters、Troy J. Comi、Richard H. Perry
DOI:10.1007/s13361-015-1171-5
日期:2015.9.1
Elucidating reactionmechanisms is important for advancing many areas of science such as catalyst development. It is often difficult to probe fast reactions at ambient conditions with high temporal resolution. In addition, systems involving reagents that cross-react require analytical methods that can minimize interaction time and specify their order of introduction into the reacting system. Here, we
阐明反应机理对于推进许多科学领域(例如催化剂开发)非常重要。通常很难在环境条件下以高时间分辨率探测快速反应。另外,涉及交叉反应试剂的系统需要能够最大限度减少相互作用时间并指定将其引入反应系统的顺序的分析方法。在这里,我们通过将微滴喷雾引向一系列带有涂有试剂的微米级开口的网眼,探索了传输模式解吸电喷雾电离(TM-DESI)在反应监测中的实用性,这种方法称为多阶段反应性TM-DESI(TM)n -DESI,其中n表示网格数;n = 2(在此报告中)。反应的各个阶段在每个网孔表面开始,从而在朝着质谱仪行进的微滴反应容器中生成中间体和产物。使用这种方法,我们研究了普萘洛尔和其他底物的铁卟啉催化羟基化反应的反应性。我们的实验结果表明,TM n -DESI提供了在空间上分离试剂并控制将其引入反应系统的顺序的能力,从而将导致催化剂失活和降解产物的不良反应降至最低。此外,与DESI-MS分析(Zare和
One Model, Two Enzymes: Activation of Hydrogen and Carbon Monoxide
pot would be a major boon to hydrogen technology since CO is a consistent contaminant of H2 supplies. Here, we report just such a catalyst, with the ability to catalyze the oxidation of either or both H2 and CO, based on the pH value. This catalyst is based on a NiIr core that mimics the chemical function of [NiFe]hydrogenase in acidic media (pH 4–7) and carbonmonoxide dehydrogenase in basic media
Methods for improving cognitive function via modulation of quinone reductase 2
申请人:Carmel-Haifa University Economic Corp. Ltd.
公开号:US10676747B2
公开(公告)日:2020-06-09
An active agent capable of reducing quinone reductase 2 activity is for use in improvement of cognition in a subject. Such an active agent can be a nucleic acid molecule that reduces the gene expression level of quinone reductase 2 or an inhibitor of quinone reductase 2 activity. A pharmaceutical composition can contain the active agent or a vector containing the active agent.