检索结果-南通市图书馆

Selectivity of guanidinium ionic liquid for capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第11期21卷 1358-1360页

作者： Kai Lu Li Zhen Qiao Mei Ling Qi Ruo Nong Fu Department of Chemistry School of Sciences Beijing Institute of Technology Beijing 100081 China

A guanidinium ionic liquid,N,N,N＇,N＇-tetrahexyl-N＂,N＂-dimethylguanidinium bis（trifluoromethane）sulfonylimide（THDMGNTf2）, was synthesized and used as stationary phase for capillary gas *** comparison with imidazolium ionic liquid stationary phase,the present new stationary phase exhibits quite different selectivity and behaves more like a low polar stationary *** guanidinium ionic liquid of THDMG-NTf2 exhibited better separation of Grab test mixture than imidazolium ionic liquid of 1-octyl-3-butylimidazolium bis（trifluoromethane）sulfonylimide（OBIM-NTf2）.Solvation parameter model was also used to evaluate the selectivity of ***,essential oil of Magnolia biondii Pamp was analyzed to further evaluate the selectivity of THDMG-NTf2 for a sample of complicated *** separation of the essential oil was achieved on a THDMG-NTf2 column（10 m） while using a commercial column（30 m） as *** present study shows that the guanidinium ionic liquid possesses novel chromatographic selectivity and has great potential for wide applications.

关键词： Guanidinium ionic liquids capillary gas chromatography Stationary phase

Separation performance of graphene oxide as stationary phase for capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第1期26卷 47-49页

作者： Yu Feng Chuan-Gang Hu Mei-Ling Qi Ruo-Nong Fu Liang-Ti Qu Key Laboratory of Cluster Science Ministry of Education of ChinaBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials and School of ChemistryBeijing Institute of Technology

Graphene oxide（GO） has attracted extensive attention due to its unique properties and potential ***,we report the investigation of GO nanosheets as a stationary phase for capillary gas chromatographic（GC） *** GO column,fabricated by a new one-step coating approach,showed average McReynolds constants of 308,suggesting the medium polar nature of the GC stationary *** GO stationary phase achieves good separation for analytes of different types with good peak shapes,especially for H-bonding analytes,such as alcohols and *** different retention behaviors of GO stationary phase from the conventional stationary phase may originate from its multiple interactions with analytes,involving H-bonding,dipole-dipole,π-π stacking and dispersive ***,GO column showed good separation reproducibility with relative standard deviation（RSD%） less than 0.24%（n = 5） on retention times of analytes.

关键词： Graphene oxide nanosheets Stationary phase Separation performance capillary gas chromatography

Determination Enantiomer Excess(e.e.%)of Chiral Sharpless Epoxides with β-Cyclodextrin Derivatives as Chiral Stationary Phases of capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第4期17卷 505-508页

作者： Xue Yan SHI Pei LIANG Xi Wu GAO Department of Entomology China Agricultural University Beijing 100094

Using four β-cyclodextrin derivatives, 2,6-di-O-benzyl-3-O-heptanonyl-β-CD, 2,6-di- O-benzyl-3-O-octanonyl-β-CD, 2,3-di-O-benzyl-6-O-heptanonyl-β-CD, and 2,3-di-O-benzyl -6-O- octanonyl-β-CD, as chiral stationary phases of capillary gas chromatography （CGC）, the enantiomers of Sharpless epoxides were well separated. The enantiomer excess values （e.e.%） of some chiral Sharpless epoxides were also determined successfully using these CDs.

关键词： Sharpless epoxides enantiomer excess capillary gas chromatography cyclodextrin derivatives.

Novel guanidinium-based ionic liquids as stationary phases for capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第9期21卷 1133-1136页

作者： Li Zhen Qiao Kai Lu Mei Ling Qi Ruo Nong Fu School of Sciences Beijing Institute of TechnologyBeijing 100081China

The present study describes guanidinium-based ionic liquids（GBILs） as stationary phases for capillary gas chromatography （CGC） and to the best of our knowledge,no related reports are available up to *** this study,a hexaalkylguanidinium ionic liquid（DOTMG-NTf;） was synthesized and coated statically onto capillary *** of the stationary phase was evaluated by separating Grob test mixture,test mixture,alcohols mixture,and fatty acid methyl esters mixture,and thermal stability was investigated as *** present study demonstrates that GBILs as CGC stationary phases exhibit satisfactory selectivity and thermal stability and have a great potential as new candidates for CGC stationary phases.

关键词： Guanidinium-based ionic liquids capillary gas chromatography Stationary phase

Polysiloxane with Pendant [60]Fulleropyrrolidines as Stationary Phase for capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第9期9卷 847-850页

作者： Ying LIU Xun Gao ZHANG Han Ying YE (Department of Analysis and Measurement Science, Wuhan University, Wuhan 430072),Yuan Yin CHEN Zhao Rui ZENG (Department of Chemistry, Wuhan University, Wuhan 430072),Rong Sheng SHENG (Wuhan Broadcasting and TV Univer Department of Analysis Science Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China Wuhan Broadcasting and TV University Wuhan 430030 China

Polysiloxane with pendant [60] fulleropyrrolidines was synthesized and used as the stationary phase for capillary gas chromatography for the first time. A preliminary investigation of its property shows that it has an... 详细信息

关键词： polysiloxane fulleropyrrolidine stationary phase capillary gas chromatography

Enantioselective Determination of R-(-)-and S-(+)-Mexiletine in Microsomal Incubates by capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Journal of Chinese Pharmaceutical Sciences 1998年第4期7卷 34-37页

作者：王似菊毛海琼曾苏浙江医科大学药学院

A method for the assay of R ( ) and S (+) mexiletine in rat liver microsomal incubates was developed. The method involved extraction of mexiletine from the microsomal incubates, and formation of mexiletine diastereomeric derivatives with a chiral reagent S ( ) N trifluoroacetyl prolyl chloride. Separation and quantitation of the diastereomeric mexiletine derivatives were carried out by a capillary gas chromatographic system with flame ionization detection. The assay was linear from 5 to 500 μg/ml for each enantiomer. The average recoveries of analytical method were 93 31±5 59% and 93 10±5 11% for R ( ) and S (+) mexiletine, respectively. The limits of detection and quantitation for the method were 1 0 μg/ml and 5 0 μg/ml for the R ( ) and S (+) mexiletine isomers, respectively. The reproducibility in the assay was better than 16.5% (RSD). The method has been applied to the metabolism study of R ( ) and S (+) mexiletine in rat liver microsomal incubates.

关键词： Mexiletine capillary gas chromatography Enantiomer separation

Preparation of CB8-Cd Column by Sol-gel Technology for capillary gas chromatography

在线全文

学校读者我要写书评

暂无评论

Preparation of CB8-Cd Column by Sol-gel Technology for Capil...

Preparation of Dithienyl Benzothiadiazole Derivatives as Stationary Phase for capillary gas chromatography Through A Polymerization Reaction

河南省化学会2016年学术年会

作者： Tao Sun Meiling Qi College of Chemistry and Chemical Engineering and Henan Key laboratory of Function-Oriented Porous Materials Luoyang Normal University Key Laboratory of Cluster Science Ministry of Education of China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials and School of Chemistry Beijing Institute of Technology

A new sol-gel capillary column consisting of the complex cucurbituril[8] with cadmium(II)(CB8-Cd)was prepared for capillary gas chromatographic(CGC) separation. The average polarity of the as-prepared columns evaluated by Mc Reynolds constants was 88, suggesting its nonpolar *** column efficiencies were 1400 theoretical plates/m for the CB8-Cd column. The retention behaviors and separation efficiencies were demonstrated by separating the n-alkanes, bromoalkanes,halogeno benzenes and BTEX. In conclusion, the present study demonstrates that CB8-Cd stationary phases exhibit satisfactory selectivity and have good prospect for complexation chromatography.

关键词： Sol-gel capillary gas chromatography Cucurbiturils Stationary phases

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Preparation of Dithienyl Benzothiadiazole Derivatives as Sta...

Preparation of insoluble β-CD polymer and its application to enantiomers and isomers separation

河南省化学会2016年学术年会

In this study, 4,7-di(5-allyl-2-thienyl)-benzothiadiazole(DTBT-R1) was used to prepare cross-linked DTBT- R1 column for capillary gas chromatography(CGC). The prepared capillary column of DTBTR1 achieved column efficiency of 1939 plates/m, and showed medium polarity based on the measured Mc Reynolds constants. Additionally, the DTBT-R1 columns showed good separation performance for a variety of analytes such as n-alkanes, alcohols, esters, aldehydes, aromatic hydrocarbons and Grob mixtures. In conclusion, this work demonstrates the excellent chromatographic performance of DTBT derivatives as a new type of GC stationary phases and their potential in separation science.

关键词： Dithienyl benzothiadiazole capillary gas chromatography Stationary phases

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2001年第1期8卷 57-59页

作者： YI Jian ming 1,TANG Kuo wen 2 (1.College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China 2.Department of Chemical Engineering, Yueyang Normal University, Yueyang 414000, China) College of Chemistry and Chemical Engineering Central South University Changsha China Department of Chemical Engineering Yueyang Normal University Yueyang China

An insoluble β-cyclodextrin polymer cross-linked with epichlorohydrin was prepared, and its structure was identified with infrared spectrum. Colloid stationary phase was prepared by dissolving the polymer in the mixed solvent of diisopropyl ether, methylene dichloride and benzene and treated for 0.5 h by ultrasonication, and then was coated on a fused silica capillary column. The optimun reaction conditions are as follows: the mole ratio of epichlohydrin to β-cyclodextrin is 12.1:1, reacting at 65 °C for 24 h. The Chromatographic performance such as column efficiency, thermal stabilities and polarity were studied, two kinds of disubstituted benzene isomers and eight pairs of enantiomers were separated on the capillary column. The results show that the β-cyclodextrin polymer is suitable for use as a capillary gas chromatographic stationary phase, and possess excellent chromatographic properties in separating enantiomers and position isomers.

关键词： insoluble β cyclodextrin polymer capillary gas chromatography enantiomer position isomer separation