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AN EASY-TO-MAKE OZONE GENERATOR FOR THE IMMOBILIZATION OF STATIONARY PHASES IN GC CAPILLARY COLUMNS
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作者 Bing Jiu XU and Shan Nian DONG Dept. of Anal. Chem., School of Pharm. Sci. Beijing Medical University, Beijing, 100083 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第10期793-796,共4页
An easy-to-make ozone generator which can be made with readily available materials is proposed. Concentration of the ozone prepared with this generator could reach that of ozone in equilibrium with oxygen. Cured with ... An easy-to-make ozone generator which can be made with readily available materials is proposed. Concentration of the ozone prepared with this generator could reach that of ozone in equilibrium with oxygen. Cured with the ozone thus prepared, GC capillary columns with immobilized SE-54 phase and excellent chromatographic performance were successfully prepared. 展开更多
关键词 AN EASY-TO-MAKE OZONE GENERATOR FOR THE IMMOBILIZATION OF STATIONARY PHASES IN GC capillary columns GC
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Investigation on chiral capillary columns and their application in separation of enantiomers
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作者 ZHOU, Liang-Mo LOU, Xian-Wen +2 位作者 LIU, You-Qin WANG, Qing-Hai ZHU, Dao-Qian Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116012 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1992年第5期430-433,共0页
Six chiral diamide stationary phases (CSPs), namely N-(3-carbobenzoxypropionyl)-L- Val-tert-butylamide (CSP-1), N-undecenoyl-L-Val-S-α-phenylethylamide (CSP-2), N-undecenoyl-L- Val-R-α-phenylethylamide (CSP-3), OV-2... Six chiral diamide stationary phases (CSPs), namely N-(3-carbobenzoxypropionyl)-L- Val-tert-butylamide (CSP-1), N-undecenoyl-L-Val-S-α-phenylethylamide (CSP-2), N-undecenoyl-L- Val-R-α-phenylethylamide (CSP-3), OV-225-L-Val-tert-butylamide (CSP-4), XE-60-L-Val-tert- butylamide (CSP-5) and polycyanoethyl vinyl siloxane-L-Val-tert-butylamide (CSP-6), were inves- tigated and CSP-6 was crosslinked within narrow bore (70 μm) fused silica capillary columns. The separation of amino acid enantiomers on this narrow bore column by gas chromatography (GC) is illustrated. 展开更多
关键词 CSP Investigation on chiral capillary columns and their application in separation of enantiomers
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Capillary Zone Electrophoretic Separation of Basic Proteins with Coated Columns Prepared by Sol-Gel Technology
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作者 Fang LI Hui JIN +2 位作者 Ruo Nong FU Jun Ling GU Guang Ju LU(Department of Chemical Engineering & Materials Science, Beijing Institute of Technology, Beijing 100081) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第9期793-796,共4页
Coated capillary columns were prepared by sol-gel technology and used in the separation of basic proteins with capillary zone electrophoresis. The results indicated that a significant decrease in protein adsorption wa... Coated capillary columns were prepared by sol-gel technology and used in the separation of basic proteins with capillary zone electrophoresis. The results indicated that a significant decrease in protein adsorption was obtained and EOF was also diminished to zero in the pH range of 3-10. 展开更多
关键词 Basic capillary Zone Electrophoretic Separation of Basic Proteins with Coated columns Prepared by Sol-Gel Technology
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THE SEPARATIONS OF ENANTIOMERS OF α—SUBSTITUTED-(2—PYRIDYL)—METHYLAMINES ON A CHIRASIL-VAL CAPILLARY COLUMN
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作者 Lan Jun WU Ai Qiao MI Yao Zhong JLANG Chengdu Institute of Organic Chemistry Academia Sinica,Chengdu 610015 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第3期243-244,共2页
Enantiomers of a-substituted-(2-pyridyl)-methylarfdnes uere separated on SC -7 gas chromatograph with a 20m×0.25mm Chirasil-Val capIlary column,Carrier gas was nitro- gen or hydrogen.The resolution factors(ri.s) ... Enantiomers of a-substituted-(2-pyridyl)-methylarfdnes uere separated on SC -7 gas chromatograph with a 20m×0.25mm Chirasil-Val capIlary column,Carrier gas was nitro- gen or hydrogen.The resolution factors(ri.s) were 1.02 to 1.06.Enantiomers of pyridyl anines were separated to and near to base line. 展开更多
关键词 VAL SUBSTITUTED THE SEPARATIONS OF ENANTIOMERS OF METHYLAMINES ON A CHIRASIL-VAL capillary COLUMN PYRIDYL
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CHROMATOGRAPHIC SEPARATION OF THE ENANTIOMERS OF 3-PHENYL-1,2-EPOXYETHANE AND 1-PHENYL-1-PROPANOL ON A FUSED SILICA CAPILLARY COLUMN COATED WITH PERBENZYL-β-CYCLODEXTRIN
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作者 Hong WANG Xiao Yu WANG +1 位作者 Yuan De LONG Tian Bao HUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第11期901-902,共2页
A β-cyclodextrin derivative, perbenzyl-β-cyclodextrin, was prepared and used as a chiral stationary phase for capillary gas chromatography. Using FID detector and the column temperature between 70 and 80℃, the chir... A β-cyclodextrin derivative, perbenzyl-β-cyclodextrin, was prepared and used as a chiral stationary phase for capillary gas chromatography. Using FID detector and the column temperature between 70 and 80℃, the chiral separations of racemic 3-phenyl-1, 2-epoxyethane and 1-phenyl-1-propanol on a 14m×0.23mm I. D. fused silica column with the β-cyclodextrin derivative were carried out and the optical purities of optically active 1-phenyl-1-propanol samples prepared by asymmetric synthesis were determined. 展开更多
关键词 CYCLODEXTRIN CHROMATOGRAPHIC SEPARATION OF THE ENANTIOMERS OF 3-PHENYL-1 2-EPOXYETHANE AND 1-PHENYL-1-PROPANOL ON A FUSED SILICA capillary COLUMN COATED WITH PERBENZYL Long
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Rapid Determination of HAAs Formation Potential of the Reaction of Humic Acid with Chlorine or Chlorine Dioxide 被引量:1
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作者 ZHU Zhi-liang GE Yuan-xin ZHANG Rong-hua MA Hong-mei ZHAO Jian-fu 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第3期268-272,共5页
On the basis of gas chromatography(GC) coupled with a short capillary column and an electron capture detector ( ECD), a simple and rapid method for the determination of five haloaceric acids ( HAAs ) in drinking... On the basis of gas chromatography(GC) coupled with a short capillary column and an electron capture detector ( ECD), a simple and rapid method for the determination of five haloaceric acids ( HAAs ) in drinking water was developed by the optimization of derivation conditions and the modification of gas chromatographic program. HAAs formarion potential(HAAFP) of the reaction of humic acid with chlorine was determined via this method. The major advantages of the method are the simplicity of chromatographic temperature program and the short run time of GC. Dichloroaceric acid(DCAA) and Trichloroacetic acid(TCAA), which were detected in the determination of HAAFP, were rapidly formed in the first 72 h of the reaction of humic acid with chlorine. HAAFP of the reaction of humic acid with chlorine increased with the increase in the concentrations of humic acid and chlorine. The average HAAFP of the reaction of humic acid with chlorine was 39.9μg/mg TOC under the experimental conditions. When the concentration of humic acid was 4 mg/L, the concentration of HAAs, which were produced in the reaction of humic acid with choline, may exceed MCL of 60μg/L HAAs as the water quality standards for urban water supply of China and the first stage of US EPA disinfecrion/disinfection by-products(D/DBP) rule; when the concentration of humic acid was 2 mg/L, the concentration of HAAs may exceed MCL of 30 μg/L HAAs for the second stage of US EPA D/DBP rule. When humic acid was reacted with chlorine dioxide, only DCAA was detected with a maximum concentration of 3.3 μg/L at a humic acid content of 5 mg/L. It was demonstrated that the substitution of chlorine dioxide for chorine may entirely or partly control the formation of HAAs and effectively reduce the health risk associated with disinfected drinking water. 展开更多
关键词 Humic acid Short capillary column CHLORINE HAAs formation potential(HAAFP)
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Effects of Coated Capillary Column, Derivatization, and Temperature Programming on the Identification of Carica papaya Seed Extract Composition Using GC/MS Analysis
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作者 Muhamad Shirwan Abdullah Sani Jamilah Bakar +1 位作者 Russly Abdul Rahman Faridah Abas 《Journal of Analysis and Testing》 EI 2020年第1期23-34,共12页
Some of the common practices to assess the composition of plant extract,including Carica papaya seed extract(CPSE)are direct injection of the extract,compound separation using polyethylene glycol capillary column(DB-W... Some of the common practices to assess the composition of plant extract,including Carica papaya seed extract(CPSE)are direct injection of the extract,compound separation using polyethylene glycol capillary column(DB-WAX),and non-linear-temperature programming(NLTP)of GC/MS analysis.This study specifically compared the coating of capillary column,sample derivatization,and temperature programming of GC/MS to determine the composition of CPSE.The retention indices(RI)of the detected compounds were determined and compared to the reference RI.In particular,5%phenyl-95%methylpolysiloxane(HP-5MS)-,DB-WAX-,and biscyanopropyl polysiloxane(HP-88)-coated capillary columns were used to identify the composition of CPSE.For this study,HP-5MS column,which separated the highest number of compounds(26 compounds)from CPSE,was deemed as the most suitable column.The GC/MS analysis of derivatized CPSE identified 21 compound groups,where fatty acids and fatty acid methyl esters served as the major compounds(80.23%),followed by these compounds in decreasing order:amides>nitriles>sterols>fatty aldehydes>organic acids.A stronger correlation determination between the carbon number and alkane retention time of linear-temperature programming(LTP)(R^(2)=0.9859)was found,as compared to its correlation determination with NLTP(R^(2)=0.9175),which exhibited an almost equal RI of LTP to the reference RI.Conclusively,GC/MS analysis for the derivatized CPSE using HP-5MS column separation and LTP is highly recommended. 展开更多
关键词 capillary column Carica papaya seed GC/MS Sample derivatization Temperature programming
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