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Enantiomeric Separation of Epinephrine and Salbutamol by micellar electrokinetic chromatography Using β-Cyclodextrin as Chiral Additive

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Chinese Journal of Chemistry 2004年第8期22卷 845-848页

作者：郑妍鹏莫金垣 School of Science Beijing Jiaotong University Beijing 100044 China School of Chemistry and Chemical Engineering Zhongshan University Guangzhou Guangdong 510275 China

Enantiomeric separations of epinephrine and salbutamol, by means of micellar electrokinetic chromatography (MEKC) employing β-cyclodextrin as chiral additive in ammonium chloride-ammonia solution were investigated. In this system, the analytes migrated with the micellar phase towards the anode and were detected by electrochem- istry using gold microelectrode at +0.65 V vs. SCE. The success of the chiral separations is strongly dependent on the concentration of β-CD and SDS, and the optimal concentration is 8 mmol?L-1 and 15 mmol?L-1 respectively. The effects of detection potential, pH value of electrolyte and applied voltage were discussed also. Using the pro- posed method, baseline separation of the enantiomers could be accomplished in 6 min. Further, an attempt was made to elucidate the plausible mechanism of the chiral recognition.

关键词： micellar electrokinetic chromatography electrochemical detection enantiomer separation epineph- rine salbutamol

Study of Tea Digitized Chromatographic Fingerprint Spectra Using micellar electrokinetic chromatography

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Chinese Journal of Chemistry 2003年第10期21卷 1325-1329页

作者：宋冠群林金明屈锋董文举 Research Center for Eco Environmental Sciences College of Chemistry and Environmental Science

This paper described the principle of digitized chromatographic fingerprint spectrum and established digitized chromatographic fingerprint spectra of ten brands of Chinese famous tea by the micellar electrokinetic chromatography. This work was done using a 25 mmol·L -1 sodium dodecylsulfate in a 20 mmol·L -1 borate (pH 7 0) solution as running buffer, 20 kV applied potential and detection at 280 nm. The chromatographic fingerprint spectra were digitized by the relative retention value ( α ) and the relative area ( S r), and were analyzed to identify the tea samples. In the absence of the standard samples, the present method was easy setup and inexpensive, and provided the applicable information for the quality assessment of teas.

关键词： tealeaves micellar electrokinetic chromatography digitized chromatographic fingerprint spectrum quality assessment

Enantiomeric Separation of Epinephrine and Salbutamol by micellar electrokinetic chromatography Using β-Cyclodextrin as Chiral Additive

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Chinese Chemical Letters 2004年第10期15卷 1209-1211页

作者： YanPengZHENG JinYuanMO SchoolofScience BeijingJiaotongUniversityBeijing100044 SchoolofChemistryandChemicalEngineering ZhongshanUniversityGuangzhou510275

Enantiomeric separation of epinephrine and salbutamol was investigated by micellar electrokinetic chromatography employing β-cyclodextrin as chiral additive in ammonium chloride-ammonia solution. The analytes were detected by electrochemistry using gold microelectrode at +0.65 V versus SCE reference electrode. The effects of detection potential, concentration of β-cyclodextrin, concentration of sodium dodecyl sulfate, pH value of electrolyte and applied voltage were discussed.

关键词： micellar electrokinetic chromatography electrochemical detection enantiomer separation epinephrine salbutamol.

Simultaneous determination of ten nucleosides and bases in Ganoderma by micellar electrokinetic chromatography

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Food Science and Human Wellness 2022年第2期11卷 263-268页

作者： Feiya Sheng Songsong Wang Xiao Luo Jianbo Xiao Linfeng Hu Peng Li State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao999078China School of Basic Medical Sciences Chengdu UniversityChengdu 610106China Chengdu Institute for Food and Drug Control Chengdu610045China Chongqing Key Laboratory of Medicinal Resources in the Three Gorges Reservoir Region School of Biological and Chemical EngineeringChongqing University of EducationChongqing400067 China

Ganoderma(lingzhi)is a famous herbal medicine and edible supplement in oriental countries for a long *** this study,a simple micellar electrokinetic chromatography(MEKC)method was established for the analysis of nucleosides and bases,the major bioactive components in Ganoderma for the first *** optimizing the borate concentration,the sodium dodecyl sulfate(SDS)concentration and the pH value of running buffer,10 nucleosides and bases achieved an ideal *** real sample analysis,the developed method was successfully used to determine the 10 target analytes in 23 batches of Ganoderma samples from different *** indicated that contents of 10 investigated analytes in each sample showed obvious *** principal components analysis(PCA)and hierarchical cluster analysis(HCA)analysis classified the samples into three groups,and the HCA tree visualized the relationships which was mainly contributed by geographical *** results indicated geographical origin to be an important factor that affect the accumulation of nucleosides and bases in *** summary,this study provides a simple and practical strategy for quality assessment and cultivation reference of Ganoderma.

关键词： Ganoderma Nucleosides Bases micellar electrokinetic chromatography Quality assessment

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爆炸残留物的毛细管电泳检测

分析化学 2011年第8期39卷 1293-1294页

作者：陈春杨卡不勒江·卡旦陈翠杰杨丽张军富谢文林东北师范大学化学学院吉林省公安厅物证鉴定中心

1引言爆炸是恐怖袭击的常用手段。对痕量爆炸残留物进行高效检测,从而准确判断炸药的成分和种类,能够为侦破案件提供重要的线索和证据[1,2]。近年来,毛细管电泳技术初步显示了其在爆炸物检验方面的巨大潜力[3～6]。本实验基于毛细管电... 详细信息

1引言爆炸是恐怖袭击的常用手段。对痕量爆炸残留物进行高效检测,从而准确判断炸药的成分和种类,能够为侦破案件提供重要的线索和证据[1,2]。近年来,毛细管电泳技术初步显示了其在爆炸物检验方面的巨大潜力[3～6]。本实验基于毛细管电泳间接紫外吸收检测[7,8]和胶束电动色谱[9],建立了痕量爆炸残余物的系统分析检验方法,通过对爆炸瞬间产生的痕量

关键词： Capillary electrophoresis Explosives residues In-direct UV detection micellar electrokinetic chromatography

Chiral Recognition of Binaphthyl Derivatives with L-Undecyl Leucine Surfactants in the Presence of Sodium and Lysine Counterions

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American Journal of Analytical Chemistry 2021年第5期12卷 188-201页

作者： Mauro Garcia Amanda Risley Fereshteh Billiot Eugene Billiot Kevin Morris Department of Physical and Environmental Sciences Texas A&M University-Corpus Christi Corpus Christi USA Department of Chemistry Carthage College Kenosha USA

This study investigates the effect of counterions on the chiral recognition of 1,1'-Binaphthyl-2,2'-diamine (BNA) and 1,1'-Binaphthyl-2,2'-diyl hydrogenphosphate (BNP) enantiomers when using an amino acid-based surfactant undecanoyl L-leucine (und-Leu) as the chiral pseudostationary phase in capillary electrophoresis. The effects of using two different counterions (sodium and lysine) on the chiral recognition of binaphthyl derivatives were compared at varying pH conditions. The enantiomeric separation of BNA and BNP enantiomers via capillary electrophoresis, using und-Leu as the chiral recognition medium, significantly improved the enantiomeric resolution in capillary electrophoresis at pH 7 when using Lysine counterions as compared to using sodium as the counterion. More specifically, at a surfactant concentration of 45 mM, at pH 7, a significant increase in chiral selectivity was observed when lysine was used as the counterion compared to sodium. The enantiomeric resolution of BNA and BNP increased by 6-fold and 1.1-fold, respectively, in capillary electrophoresis experiments when lysine was utilized as the counterion compared to using sodium. Furthermore, the retention factor of BNA and BNP enantiomers also increased approximately 3.5-fold and 4-fold, respectively, in the presence of lysine counterions as compared to using sodium counterions. When running buffer in capillary electrophoresis was increased to pH 11, the resolution and retention factors were nearly identical when comparing the effects of the sodium and lysine counterions. This signifies the important role of lysine’s positive net charge on chiral recognition. This study provides insight into the potential advantages of using cationic, pH-dependent counterions such as lysine to significantly improve the chiral recognition of binaphthyl derivatives when using chiral anionic surfactants as the pseudostationary phase in capillary electrophoresis.

关键词： Lysine Binaphthyl Counterions Chiral Recognition Amino Acid-Based Sur-factants micellar electrokinetic chromatography