文献类型： 外文期刊

作者： Xie, MJ ¹ ; Feng, YQ ² ; Da, SL ² ; Meng, DY ² ; Ren, LW ² ;

作者机构： 1.Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

2.Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China; Hubei Acad Agr Sci, Agr Testing Ctr, Wuhan 430064, Peoples R China

关键词： capillary electrophoresis;open tubular capillary electrochromatography;magnesia-zirconia;basic compounds;polycyclic aromatic hydrocarbons

期刊名称：ANALYTICA CHIMICA ACTA （ 影响因子：6.558； 五年影响因子：6.228 ）

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收录情况： SCI

摘要： A novel magnesia-zirconia coating was fabricated inside fused-silica capillaries. The capillaries coated with magnesia- zirconia exhibited switchable electro-osmotic flow (EOF) whose magnitude and direction can be manipulated by changing the pR of running electrolyte. In Tris electrolyte at high pR (>5.2), the direction was from anode toward cathode, whereas at low pR ( <5.2), the direction of EOF was reversed. The magnesia-zirconia coated capillary can be modified by S042- and alkylphosphonate easily based on strong Lewis acid-base interaction. The separations of six basic compounds were compared on magnesia-zirconia coated capillary and S042- modified magnesia-zirconia coated capillary under different conditions. It was found that the S042- modified magnesia-zirconia coated capillary with reverse4 EOF in Tris-methanol (80/20, vlv) at pR 2.5 was suitable for the separation of the six basic compounds. For the alkylphosphonate modified magnesia-zirconia coated capillary, the alkyl moiety on the inner wall enabled it to separate polycyclic aromatic hydrocarbon (PAR). Six PARs were separated on thealkylphosphonate modified magnesia-zirconia coated capillary with CR3CN + 20 mmo1/1 Tris (25/75, vlv) as the mobile phase within 13 rnin. The magnesia-zirconia coated capillary was stable over a wide pR range.