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Li, Jun,Cui, Yuanchao,Bi, Chenxi,Feng, Shaoqiong,Yu, Fengzhen,Yuan, En,Xu, Shengzhen,Hu, Zhe,Sun, Qi,Wei, Dengguo,Yoon, Juyoung American Chemical Society 2019 ANALYTICAL CHEMISTRY - Vol.91 No.11
<P>Hydrazine induced toxicity causes serious harm to the health of humans. The detection of N<SUB>2</SUB>H<SUB>4</SUB> in vitro and in vivo has attracted a great deal of attention, especially in the context of fluorescent probes. Although some fluorescent N<SUB>2</SUB>H<SUB>4</SUB> probes have been reported, only a few operate in purely aqueous media and, as a result, require the use of organic cosolvents which hinders their use in analysis of real samples. In addition, most of the current N<SUB>2</SUB>H<SUB>4</SUB> probes are either “off-on” or “on-off” types, in which it is difficult to eliminate interference from background fluorescence commonly occurring in in vitro and in vivo systems. Furthermore, some probes are unable to differentiate hydrazine from other organic amines. To address the above problems, we developed a novel oligo(ethylene glycol)-functionalized fluorescent probe for the detection of N<SUB>2</SUB>H<SUB>4</SUB>. The probe, which has a donor−π-acceptor (D−π-A)-type structure, is water-soluble, and it can be utilized to selectively detect N<SUB>2</SUB>H<SUB>4</SUB> in both colorimetric and ratiometric mode. Furthermore, the probe is able to differentiate hydrazine from other organic amines and can be used to detect hydrazine vapor and for imaging A549 cells and zebrafish.</P> [FIG OMISSION]</BR>
Qin Yilin,Liao Wei,Lan Tu,Li Fengzhen,Li Feize,Yang Jijun,Liao Jiali,Yang Yuanyou,Liu Ning 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
Hydroxyurea (HU) is a novel salt-free reductant used potentially for the separation of U/Pu in the advanced PUREX process. In this work, the radiation stability of HU were systematically investigated in solution by examining the effects of the type of rays (a, b, and g irradiations), the absorbed dose (10 e50 kGy), and the HNO3 concentration (0e3 mol L1 ). The influence degree on HU radiolysis rates followed the order of the absorbed dose > the ray type > the HNO3 concentration, but the latter two had moderate effects on HU radiolysis products where NH4 þ and NO2 were found to be the most abundant ones, suggesting that the differences of a, b, and g rays should be considered in the study of irradiation effects. The radiolysis mechanism was explored using density functional theory (DFT) calculations, and it proposed the dominant radiolysis paths of HU, indicating that the radiolysis of HU was mainly a free radical reaction among $H, eaq e , H2O, intermediates, and the radiolytic free radical fragments of HU. The results reported here provide valuable insights into the mechanistic understanding of HU radiolysis under a, b, and g irradiations and reliable data support for the application of HU in the reprocessing of spent fuel.