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题名: Roles of organic modifiers in micellar electrokinetic capillary chromatography
作者: Liu, Z;  Zou, HF;  Zhang, YK
关键词: micellar electrokinetic capillary chromatography ;  electroosmotic migration ;  electrophoretic migration of micelle ;  retention mechanism
刊名: HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY
发表日期: 1998-04-01
卷: 21, 期:4, 页:234-240
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: In the present work, four organic modifiers, Pit. urea, dioxane, methanol, and tetrahydrofuran, were comparatively and systematically studied in terms of their effects on electrokinetic migration behavior and the retention mechanism of homologous solutes in MECC. The results showed that the electroosmotic mobility, mu(eo), and the electrophoretic mobility of a micelle, mu(cp,mc), decrease linearly with increasing organic modifier concentration. The ability of organic modifiers to lower mu(eo) is greater than their ability to lower mu(ep,mc). The negative values of the slopes of these linear relationships, D-eo and D-cp,D-mc, increase along the series the order urea < methanol < dioxane < tetrahydrofuran. The logarithm of the capacity factor (In k') of uncharged homologous solute, which is mainly determined by the hydrophobic interaction, decreases linearly with increasing organic modifier concentration, due not only to the decrease in the partition coefficient but also to the decrease in the phase ratio. A linear relationship was observed between the slope of the plot of ln k' vs. organic modifier concentration and the carbon number of homologous compound. The slope of such a relationship can characterize the hydrophobicity of the organic modifier. The hydrophobicity of such organic modifiers is also found to increase along the series urea < methanol < dioxane < tetrahydrofuran.
关键词[WOS]: FLUORINE MAGNETIC RESONANCE ;  ZONE ELECTROPHORESIS ;  SEPARATION ;  SOLVENTS
语种: 英语
WOS记录号: WOS:000073856400005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138142
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.Acad Sinica, Dalian Inst Chem Phys, Natl Chromatog R&A Ctr, Dalian 116011, Peoples R China

Recommended Citation:
Liu, Z,Zou, HF,Zhang, YK. Roles of organic modifiers in micellar electrokinetic capillary chromatography[J]. HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY,1998,21(4):234-240.
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