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L,L-ethylene dicysteine(L,L-EC) is a diaminodithiol(N2S2) ligand used in nuclear medicine for the preparation of 99mTc-L,L-EC, a tracer agent for renal function studies. The dithiol groups of L,L-EC are easily oxidized and form the corresponding disulfide. In this paper, the dynamic oxidation process of L,L-EC was studied by ultra-performance liquid chromatography tandem mass spectrometry(UPLC/MS/MS) in multiple reaction monitoring(MRM) mode. The kinetic experiments were conducted at three different temperatures. The reaction order and the rate constants for the transformation of L,L-EC were calculated using kinetic data under pseudo-first-order reaction conditions. The activation energy of the oxidation of L,L-EC was calculated by an Arrhenius graph. 相似文献
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本文采用直接标记法在水相中将羰基锝中间体[99Tcm (CO)3( H2O)3]+与含磷酸基团的硝基咪唑衍生物2-(2-甲基-5-硝基咪唑-1-基)乙基磷酸盐(2-( 2-methyl-5-nitro-1 H-imidazol-1-yl)ethyl dihydrogen phosphate,MNLS)配位得到99Tcm... 相似文献
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养殖银鱼水库施肥的实际运用和施肥效果的对比试验表明:用施有机肥和无机肥相结合的方法来培育水体浮游生物,可达到饵料生物增殖与银鱼增产的效果。 相似文献
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