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Determination of N-Methylcarbamate Pesticides in Vegetables by Solid-phase Extraction and pressurized capillary electrochromatography

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Chemical Research in Chinese Universities 2007年第1期23卷 109-115页

作者： WU Xiao-ping WANG Ling XIE Zeng-hong YAN Chao CHEN Guo-nan Key Laboratory of Food Safety Analysis and Detection Technology of MOE Department of Chemistry Fuzhou University Fuzhou 350002 P. R. China Unimicro Technologies Inc. Pleasanton CA94566 USA

capillary electrochromatography （CEC） is a hybrid technique that couples the good selectivity of high-performance liquid chromatography （HPLC） and the high separation efficiency of capillary electrophoresis （CE）. Both charged and uncharged compounds can be separated effectively using CEC. In some cases, however, the bubbles that generated in the capillary column in pure CEC performed on commercial CE instruments will cause unstable current and even disrupt the separation when the concentration of buffer is very high. By applying pressure on the electrochromatographic separation via a micro-HPLC pump, pressurized capillary electrochromatography （ pCEC ） combines two driving factors of the electroosmotic flow （EOF） and the pressure flow, thereby increasing the speed and the selectivity of separation and suppressing the bubble formation. Moreover,

关键词： pressurized capillary electrochromatography N-Methylcarbamate Pesticide Solid-phase extraction

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Separation of Basic Drugs Using pressurized capillary electrochromatography

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Chinese Journal of Chemistry 2003年第4期21卷 419-422页

作者：张锴阎超姚传义江正瑾张智超王琴孙高如瑜 State Key Laboratory of Elemento Organic Chemistry Nankai University Unimicro Technologies Inc. 4713 First Street Pleasanton

A novel pressurized capillary electrochromatography (PCEC) was developed to separate basic drugs on strong cation exchange (SCX) column. The separation result by using PCEC was better than that by using micro-HPLC. The effects of electrical field and pressure on plate height and resolution were investigated. Influences of organic modifier, ionic strength and pH value of buffer on retention behavior were evaluated, and the separation mechanism was also discussed.

关键词： pressurized capillary electrochromatography strong cation exchange mixed mode basic drug

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Separation of Peptides by pressurized capillary electrochromatography

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Chinese Chemical Letters 2003年第6期14卷 611-614页

作者： KaiZHANG ChaoYAN ZhiChaoZHANG QinSunWANG RuYuGAO StateKeyLaboratoryofElemento-OrganicChemistry NankaiUniversityTianjin300071 UnimicroTechnologies Inc.4713FirstStreetPleasantonCA94566USA

A novel gradient pressurized capillary electrochromatography (pCEC) instrument was developed to separate peptides. Two gradient elution modes, hydrophobic and hydrophilic interaction mode in pCEC, were performed on this instrument. Baseline separation of six peptides was obtained on two gradient modes with C18 column and strong cationic exchange column respectively. The effects of mixer volume and total flow rate of pumps on resolution were also discussed.

关键词： pressurized capillary electrochromatography peptide separation reversed phase hydrophilic interaction.

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pressurized capillary electrochromatography Coupled with Mass Spectrometry for Analysis of Peptides and Proteins

Pressurized Capillary Electrochromatography Coupled with Mas...

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第十五次全国色谱学术报告会

作者： Zhen Liang, Jicheng Duan, Lihua Zhang, Weibing Zhang, Yukui Zhang, Xiaojing Huang, Chao Yan National Chromatography Research & Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116011, China Unimicro Technologies, Inc., 1257 Quarry Lane, 105, Pleasanton, CA 94566, USA

＜正＞pressurized capillary electrochromatography （pCEC） was coupled with electro-spray ionization mass spectrometry （ESI-MS） using coaxial sheath liquid interface. It was used for separation and analysis of peptides and proteins. The effects of organic modifier and applied voltage on separation were investigated, and the effects of

关键词： pressurized capillary electrochromatography Mass spectrometry Peptides Proteins

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