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题名: Effects of organic modifiers on retention mechanism and selectivity in micellar electrokinetic capillary chromatography studied by linear solvation energy relationships
作者: Liu, Z;  Zou, HF;  Ye, ML;  Ni, JY;  Zhang, YK
关键词: organic modifiers ;  selectivity ;  retention mechanisms ;  micellar electrokinetic chromatography ;  linear solvation energy relationships ;  buffer composition
刊名: JOURNAL OF CHROMATOGRAPHY A
发表日期: 1999-11-19
卷: 863, 期:1, 页:69-79
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine ;  Physical Sciences
类目[WOS]: Biochemical Research Methods ;  Chemistry, Analytical
研究领域[WOS]: Biochemistry & Molecular Biology ;  Chemistry
英文摘要: The effects of six organic modifiers (urea, methanol, dioxane, tetrahydrofuran, acetonitrile and 2-propanol) on the retention mechanism and separation selectivity of the bulk buffer in micellar electrokinetic capillary chromatography (MECC) with sodium dodecyl sulfate (SDS) micelles as pseudo-stationary phase have been investigated through linear solvation energy relationships (LSERs). It is found that the retention value in MECC systems with or without organic modifier is primarily dependent on the solvophobic interaction and the hydrogen bonding interaction with the solute as proton acceptor, while the dipolar interaction and the hydrogen bonding interaction with the solute as proton donor play minor roles. The effects of the organic modifiers on the solvophobic, dipolar and hydrogen bonding interactions are evaluated in terms of the relationship between regression coefficient of the LSER equations and the modifier concentration. The variations of the solvophobic interaction and the dipolar interaction with change of the modifier concentration can be approximately explained using the solubility parameter and the dipolarity/polarizability parameter of the organic modifier, respectively. However, the relationships between the hydrogen bond acidity and basicity of the bulk buffer and the organic modifiers are rather complicated. Those results may be caused from the displacement of organic modifiers to the water adsorbed on the micellar surface as well as changes in the acidity and basicity of the bulk buffer with the addition of organic modifiers. In addition, it is found that the phase ratio is influenced significantly by the use of organic modifier. (C) 1999 Elsevier Science BN. All rights reserved.
关键词[WOS]: PHASE LIQUID-CHROMATOGRAPHY ;  SOLVATOCHROMIC COMPARISON METHOD ;  WATER PARTITION-COEFFICIENTS ;  SOLUTE-SOLVENT INTERACTIONS ;  MOBILE-PHASE ;  STATIONARY-PHASE ;  PSEUDOSTATIONARY PHASES ;  PARAMETERS ;  EQUATION ;  PERFORMANCE
语种: 英语
WOS记录号: WOS:000083841900007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138566
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Lab Chromatog, Natl Chromatog R&A Ctr, Dalian 116011, Peoples R China

Recommended Citation:
Liu, Z,Zou, HF,Ye, ML,et al. Effects of organic modifiers on retention mechanism and selectivity in micellar electrokinetic capillary chromatography studied by linear solvation energy relationships[J]. JOURNAL OF CHROMATOGRAPHY A,1999,863(1):69-79.
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