在Pirkle型的 (S ,S) Whelk O 1与纤维素衍生物型的CDMPC两种手性柱上对六种外消旋萘普生酯进行了对映体分离 ,通过研究烷氧基结构上的差异以及流动相中不同的醇类添加剂对手性识别的影响 ,探讨和比较了外消旋萘普生酯在两种手性固定...在Pirkle型的 (S ,S) Whelk O 1与纤维素衍生物型的CDMPC两种手性柱上对六种外消旋萘普生酯进行了对映体分离 ,通过研究烷氧基结构上的差异以及流动相中不同的醇类添加剂对手性识别的影响 ,探讨和比较了外消旋萘普生酯在两种手性固定相上手性识别的机理 .对于 (S ,S) Whelk O 1,溶质与固定相之间的吸引作用是手性识别的主要因素 ,而对于CDMPC 。展开更多
The paper reports the simultaneous fluorescence determination of D,L-tryptophanenantiomer by chiral recognition of β-cyclodextrin for the first time. Chiral discrimination isobserved for fluorescence emission of D- a...The paper reports the simultaneous fluorescence determination of D,L-tryptophanenantiomer by chiral recognition of β-cyclodextrin for the first time. Chiral discrimination isobserved for fluorescence emission of D- and L-tryptophan when complexed toβ-cyclodextrin, and is significantly related to reaction temperature, time and PH. The proposedenantiomeric resolution of D- and L-tryptophan is based on the non-fluorescellce emission ofLtryptophan in β-cyclodextrln solution at 35℃ and after 24 h standing by. The fluorescenceemission and absorbance of L-tryptophan disappear with the Increase of β-cyclodextrin at 35℃ and 24 h standing by, where as it is not observed for D-tryptophan. The detection limitsare 3.1×10-8 mol/L for D-tryptophan and 2.7 ×10-7 mol/L for L-tryptophan, respectively,with a RSD of 1. 0%-2. 6% (n=7). The method has been shown to be accurate with a ratioof 2%(molar ratio) of one enantiomer in the presence of the other. The observed pseudofirst-order rate constant is calculated. The reaction mechanism has been discussed usingpyrene as a fluorescence probe.展开更多
文摘在Pirkle型的 (S ,S) Whelk O 1与纤维素衍生物型的CDMPC两种手性柱上对六种外消旋萘普生酯进行了对映体分离 ,通过研究烷氧基结构上的差异以及流动相中不同的醇类添加剂对手性识别的影响 ,探讨和比较了外消旋萘普生酯在两种手性固定相上手性识别的机理 .对于 (S ,S) Whelk O 1,溶质与固定相之间的吸引作用是手性识别的主要因素 ,而对于CDMPC 。
文摘The paper reports the simultaneous fluorescence determination of D,L-tryptophanenantiomer by chiral recognition of β-cyclodextrin for the first time. Chiral discrimination isobserved for fluorescence emission of D- and L-tryptophan when complexed toβ-cyclodextrin, and is significantly related to reaction temperature, time and PH. The proposedenantiomeric resolution of D- and L-tryptophan is based on the non-fluorescellce emission ofLtryptophan in β-cyclodextrln solution at 35℃ and after 24 h standing by. The fluorescenceemission and absorbance of L-tryptophan disappear with the Increase of β-cyclodextrin at 35℃ and 24 h standing by, where as it is not observed for D-tryptophan. The detection limitsare 3.1×10-8 mol/L for D-tryptophan and 2.7 ×10-7 mol/L for L-tryptophan, respectively,with a RSD of 1. 0%-2. 6% (n=7). The method has been shown to be accurate with a ratioof 2%(molar ratio) of one enantiomer in the presence of the other. The observed pseudofirst-order rate constant is calculated. The reaction mechanism has been discussed usingpyrene as a fluorescence probe.