共查询到19条相似文献,搜索用时 246 毫秒
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在直链淀粉手性固定相(Chiralpak AD)上分离了二茂铁衍生物3-(1-N,N-二甲基)乙基二茂铁的对映体.考察了醇类添加剂种类和浓度、碱的浓度对对映体分离的影响,同时探讨了手性识别机理.结果发现:乙醇是最佳醇类添加剂,并且在流动相中加入少量碱有助于改善峰形,增加分离度.通过改变温度求出相应的拆分过程中热力学参数,这些参数表明在所研究温度范围内,Chiralpak AD对该溶质的分离过程为焓控过程,高温对分离不利. 相似文献
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高效液相色谱-串联质谱法结合多糖衍生物手性固定相拆分氰戊菊酯 总被引:1,自引:0,他引:1
建立了以多糖衍生物为手性固定相的高效液相色谱-串联质谱(HPLC-MS/MS)直接拆分氰戊菊酯对映体的方法。在反相液相色谱条件下,考察了手性固定相的种类、流动相组成、柱温、流速对氰戊菊酯4个立体异构体分离的影响。同时,利用热力学方法对氰戊菊酯的立体异构体与固定相之间的色谱保留和分离的热力学机理进行了探讨。结果表明:采用Lux Cellulose-3(纤维素-三(4-甲基苯甲酸酯))手性色谱柱,在以流动相为乙腈-水(5 mmol/L甲酸铵)=(55:45,V:V)流速0.4 mL/min,柱温30℃的条件下,可在14 mins内实现氰戊菊酯4个立体异构体的基线分离。拓展了HPLC-MS/MS在菊酯类手性农药对映体分离及检测上的应用。 相似文献
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The separation of enantiomers by chromatographic methods, such as gas chromatography, high‐performance liquid chromatography and capillary electrochromatography, has become an increasingly significant challenge over the past few decades due to the demand of pharmaceutical, agrochemical, and food analysis. Among these chromatographic resolution methods, high‐performance liquid chromatography based on chiral stationary phases has become the most popular and effective method used for the analytical and preparative separation of optically active compounds. This review mainly focuses on the recent development trends for novel chiral stationary phases based on chitosan derivatives, cyclofructan derivatives, and chiral porous materials that include metal‐organic frameworks and covalent organic frameworks in high‐performance liquid chromatography. The enantioseparation performance and chiral recognition mechanisms of these newly developed chiral selectors toward enantiomers are discussed in detail. 相似文献
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Two novel polymers containing glucose units as the main-chain that only differ in terms of their regioregularity were synthesized to evaluate their chiral recognition abilities as chiral stationary phases(CSPs)for high performance liquid chromatography(HPLC).The regioregular polymer(poly-5)shows clear resolution ability for the racemate of cobalt(Ⅲ)acetylacetonate(Co(acac)3),whereas the corresponding regioirregular polymer(poly-3)does not show any chiral recognition for Co(acac)3.The regioregular polymer main-chain seems to play an important role not only in providing an efficient interaction with the racemate but also in expressing the chiral recognition ability as a CSP for HPLC. 相似文献
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With the rapid development of global industry and increasingly frequent product circulation, the separation and detection of chiral drugs/pesticides are becoming increasingly important. The chiral nature of substances can result in harm to the human body, and the selective endocrine-disrupting effect of drug enantiomers is caused by differential enantiospecific binding to receptors. This review is devoted to the specific recognition and resolution of chiral molecules by chromatography and membrane-based enantioseparation techniques. Chromatographic enantiomer separations with chiral stationary phase (CSP)-based columns and membrane-based enantiomer filtration are detailed. In addition, the unique properties of these chiral resolution methods have been summarized for practical applications in the chemistry, environment, biology, medicine, and food industries. We further discussed the recognition mechanism in analytical enantioseparations and analyzed recent developments and future prospects of chromatographic and membrane-based enantioseparations. 相似文献
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Pataj Zoltn Ilisz Istvn Aranyi Anita Forr Enik Flp Ferenc Armstrong Daniel W. Pter Antal 《Chromatographia》2010,71(1):13-19
Three underivatized γ-amino acids were successfully enantioseparated by high-performance liquid chromatography on macrocyclic glycopeptide based chiral stationary phases. The effects of the alcohol modifier in the mobile phase and the column temperature on the enantioseparation were investigated. Apparent thermodynamic parameters were calculated from the plots of ln k or ln α versus 1/T. Some mechanistic aspects of chiral recognition are discussed with respect to the structures of the analytes. It was found that the enantioseparations were enthalpy-driven, the double bond in the analyte exerting a significant influence on the chiral recognition. 相似文献
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The liquid Chromatographic resolution of the racemic cardiovascular drugs naftopidil and bufuralol to their corresponding enantiomers was achieved on cellulose tris-(3,5-dimethylphenyl carbamate) chiral stationary phase known as Chiralcel OD. The chiral recognition mechanism(s) involved between the chiral stationary phase and these drugs, which include hydrogen bonding, intercalative interactions, and steric interactions, among other factors, were discussed. 相似文献