Enantiomeric excess is determined by~ 1H NMR spectral analysis using Eu ( hfo)_3 as chiral shift reagent. 用加入手征性位移试剂Eu(hfc)3的~1HNMR谱测定了对映体过量百分数。
Uranium tetrachloride as NMR shift reagent 核磁共振位移试剂四氯化铀
Chemical equilibrium and structure of complexes of 18-crown-6 with shift reagent eu ( fod)_3 in ccl_4 18-冠-6与Eu(fod)3~+在CCl4中的化学平衡及其配合物的结构
Optimisation of the experimental conditions about substrate concentration and shift reagent to substrate molar ratio led to two sets of enantiomeric resonance signals of utility for quantitative purpose. 在一定的样品浓度、合适的位移试剂与被测样物质的量比时,用来定量的对映体信号较好分离。
The study of the interaction between the enantiomer and chiral shift reagent in the determination of enantiomeric purity& betr method 对映体和手性位移试剂的作用及其纯度测定的~1H-NMR研究&BETR法
Results After infusion of the shift reagent, the extra-cellular sodium content in rat liver decreased by 17%, with obvious increase in fast T_2 component ( P < 0.01), indicating an increase in the fraction of Na~+ binding sites in the extra-cellular space. 结果输注位移试剂后,烧伤组大鼠肝脏细胞外Na+浓度降低17%,其快T2所占百分比较对照组有所增加(P<0.01),提示细胞外可与Na+结合或可影响Na+的位点增加;