the absence of PTIO, it underwent decomposition followed by recombination to give the heterocyclic nitric oxide radical 15. Incorporation of intercalating moieties endowed the N‐nitroso compounds with DNA‐cleaving ability through single‐strand scission upon UV irradiation in a phosphate buffer (pH 5.0–8.0) under aerobic conditions.
We report a two-photon excitable nitric oxide photoreleaser with ratiometric fluorescence variation, its spatiotemporally controlled release and biological applications.
我们报告了一种双光子可激发的一氧化氮光释放剂,具有比例荧光变化,其空间和时间受控释放以及生物应用。
Nitronyl and Imino Nitroxides: Improvement of Ullman's Procedure and Report on a New Efficient Synthetic Route
作者:Catherine Hirel、Kira E. Vostrikova、Jacques Pécaut、Victor I. Ovcharenko、Paul Rey
imidazolidines which bypasses the delicate synthesis of the bis(hydroxyamino) compound is described. It is shown that 3-chloroperbenzoic acid is an effective oxidant for the transformation of adequately substituted imidazolidines into nitronylnitroxides, which are obtained in high yield. An illustration of the potentialities of this new route, a newnitronylnitroxide with two ethyl substituents in positions
Photocalibrated NO Release from N-Nitrosated Napthalimides upon One-Photon or Two-Photon Irradiation
作者:Ziqian Zhang、Jiayao Wu、Zhihao Shang、Chao Wang、Jiagao Cheng、Xuhong Qian、Yi Xiao、Zhiping Xu、Youjun Yang
DOI:10.1021/acs.analchem.6b01603
日期:2016.7.19
NO donors are routinely used as the exogenous source in in vitro studies. However, the kinetics or the dose of NO release from the existing donors is not readily monitored. This complicates the elucidation of the involvement of NO in a biological response. We report herein a series of NO donors (NOD545a–g), whose NO release is triggered by UV light at 365 nm or a two-photon laser at 740 nm, and importantly, their NO release is accompanied by a drastic fluorescence turn-on, which has been harnessed to follow the kinetics and dose of NO release in a real-time fashion with spectroscopic methods or microscopic methods in in vitro studies. These merits have rendered NOD545a–g useful molecular tools in NO biology.
在体外研究中,NO 供体通常被用作外源性来源。然而,现有供体释放 NO 的动力学或剂量并不容易监测。这使得阐明 NO 在生物反应中的参与变得更加复杂。我们在此报告了一系列 NO 供体(NOD545a-g),它们的 NO 释放是由 365 纳米的紫外光或 740 纳米的双光子激光触发的,重要的是,它们的 NO 释放伴随着剧烈的荧光开启,在体外研究中,我们利用光谱方法或显微镜方法实时跟踪 NO 释放的动力学和剂量。这些优点使 NOD545a-g 成为 NO 生物学中有用的分子工具。
Substituent effects on the reaction of 2-(substituted phenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl 3-oxides with nitric oxide: an experimental and MNDO study
作者:Osamu Shimomura、Kazuhisa Abe、Minoru Hirota
DOI:10.1039/p29880000795
日期:——
constants of the oxygen transfer reaction of 2-(substitutedphenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl3-oxides with nitricoxide have been measured by using liquid chromatography (h.p.l.c.). The Hammett ρ value (–0.37) indicates that electron-donating substituents favour the reaction. This can be explained by a mechanism which includes electron transfer to nitricoxide and can be rationalised by