4-Aryl-1,3,2-oxathiazolylium-5-olates as pH-Controlled NO-Donors: The Next Generation of <i>S</i>-Nitrosothiols
作者:Dongning Lu、Janos Nadas、Guisheng Zhang、Wesley Johnson、Jay L. Zweier、Arturo J. Cardounel、Frederick A. Villamena、Peng George Wang
DOI:10.1021/ja0682226
日期:2007.5.1
release NO under acidic condition (pH = 5). The decomposition pathway of the aryloxathiazolyliumolates proceeded via an acid-catalyzed ring-opening mechanism after which NO was released and an S-centered radical was generated. Electron paramagnetic resonance (EPR) spin trapping studies were performed to detect NO and the S-centered radical using the spin traps of iron(II) N-methyl-D-glucamine dithiocarbamate
S-亚硝基硫醇 (RSNO) 是生物系统中一氧化氮 (NO) 的重要外源和内源源。合成了一系列具有不同芳基对位取代基(-CF3、-H、-Cl 和 -OCH3)的 4-aryl-1,3,2-oxathiazolylium-5-olates 衍生物。发现这些化合物在酸性条件下(pH = 5)释放 NO。芳基氧杂噻唑盐的分解途径通过酸催化的开环机制进行,然后释放 NO 并产生 S 中心自由基。使用铁 (II) N-甲基-D-葡糖胺二硫代氨基甲酸酯 [(MGD)2-FeII] 和 5,5- 的自旋陷阱进行电子顺磁共振 (EPR) 自旋捕获研究以检测 NO 和 S 中心自由基二甲基-1-吡咯啉N-氧化物(DMPO)。还,EPR自旋捕获和紫外-可见分光光度法用于分析芳基对位取代对芳基恶噻唑盐的NO释放特性的影响。结果表明,-CF3 等吸电子取代基的存在增强了芳基氧杂噻唑基盐酸盐的 NO 释放能力,而供电子取代基如甲氧基
Synthesis of Nitric Oxide Donors Derived from Piloty’s Acid and Study of Their Effects on Dopamine Secretion from PC12 Cells
(NO) generation by derivatives of Piloty’s acid (NO-donors) under physiological conditions. In order to qualitatively and quantitatively measure NO release, electron paramagnetic resonance (EPR) was carried out with NO spin trapping. In addition, voltammetric techniques, including cyclic voltammetry and constant potential amperometry, were used to confirm NO release from Piloty’s acid and its derivatives
From Lead(II) Dithiocarbamate Precursors to a Fast Response PbS Positive Temperature Coefficient Thermistor
作者:Alexander Angeloski、Angus R. Gentle、John A. Scott、Michael B. Cortie、James M. Hook、Mika T. Westerhausen、Mohan Bhadbhade、Anthony T. Baker、Andrew M. McDonagh
DOI:10.1021/acs.inorgchem.7b03009
日期:2018.2.19
in situ synchrotronpowderdiffraction experiments were performed to characterize their decomposition. The structure and purity of resultant PbS was examined using scanning electron and transmission electron microscopies, powderX-raydiffraction, and infrared spectroscopy. Submicron crystalline PbS was used to create a new PbS thermistor with excellent sensitivity and an ultrarapid thermal response
Nitric oxide release from the unimolecular decomposition of the superoxide radical anion adduct of cyclic nitrones in aqueous medium
作者:Edward J. Locigno、Jay L. Zweier、Frederick A. Villamena
DOI:10.1039/b507530k
日期:——
5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide (DEPMPO) and 5-ethoxycarbonyl-5-methyl-1-pyrroline N-oxide (EMPO) have become the spin-traps of choice for the detection of transient radical species in chemical and biological systems using electron paramagnetic resonance (EPR) spectroscopy. The mechanism of decomposition of the superoxide radical anion (O2(.-)) adducts of DMPO, DEPMPO and EMPO in aqueous solutions