Nonaqueous capillary zone electrophoresis

Multiple stages (n) of mass spectrometry in sequence Nonaqueous capillary zone electrophoresis Nitrogen-phosphorus detector Quadrupole/time-of-flight analyzer Relative standard deviation... [Pg.273]

J.M. Herrero-Martlnez, E.F. Sim6-Alfonso and G. Ramis-Ramos, Separation and determination of homologues of linear aUcylbenzenesulfonates by nonaqueous capillary zone electrophoresis using aUcylammonium salts in ethanol. Electrophoresis, 22, 2017-2024, 2001. [Pg.964]

Mori Y, Ueno K, Umeda T (1997) Enantiomeric separations of primary amino compounds by nonaqueous capillary zone electrophoresis with a chiral crown ether. J Chromatogr A... [Pg.143]

Capillary electrophoresis (CE) coupled to MS has the advantage of high resolution and soft ionization for biomolecules, which may be used to differentiate post-translational modifications and variants of intact proteins and oligonucleotides. Different modes of CE (capillary zone electrophoresis, capillary isoelectric focusing, capillary electrochromatography, micellar electrokinetic chromatography, nonaqueous capillary electrophoresis) to MS as well as online preconcentration techniques (transient capillary isotachophoresis, solid-phase extraction, membrane preconcentration) are used to compensate for the restricted detection sensitivity of the CE methodology [77, 78]. [Pg.174]

The main separation modes used in CE are capillary zone electrophoresis (CZE), micellar electrokinetic capillary chromatography (MEKC), capillary isotachophoresis, capillary gel electrophoresis, and capillary isoelectric focusing. CZE and MEKC are used most often. CE buffers are generally aqueous-based, though nonaqueous systems are exploited as well, particularly for analytes that are insoluble or sparingly soluble. [Pg.608]

Phenoxy acid herbicides, sulfonyl ureas, quaternary ammonium derivatives (quats), and aryloxy propanoic acids are the main classes of compounds subjected to capillary zone electrophoresis (CZE). Triazines are also separated using nonaqueous CZE, while low pfCa characterized chlorotriazines require an ion-pair-like solubilization using cationic surfactants (tetradecylammonium bromide, dodecyltrimethyl-ammonium bromide). Chiral selectors are added in CZE for obtaining enantioselectivity. Chiral selectors used for herbicide enantiomeric discrimination are vancomycin, y-cyclodextrin, ethyl carbonate -cyclo-dextrin, cyclohexyl-alkyl-)S-D-maltoside, sulpropyl ether a-cyclodextrin, and hexakis(2,3-di-0-methyl)-a-cyclodextrin. [Pg.2072]

In this chapter, an overview on the most relevant aspects of the analysis of alkaloids by electromigration methods, namely, capillary zone electrophoresis (CZE), nonaqueous capillary electrophoresis (NACE), micellar electrokinetic chromatography (MEKC), microemulsion electrokinetic chromatography (MEEKC), and capillary electrochromatography (CEC), is given. Selected recent applications of CE in analysis of alkaloids are summarized in a table following the classification according to the chemical nature of the considered compounds. [Pg.1154]

Capillary electrochromatography (CEC) capillary zone electrophoresis (CZE) mass spectrometry (MS) micellar electrokinetic chromatography (MEKC) microemulsion electrokinetic chromatography (MEEKC) nonaqueous capillary electrophoresis (NACE)... [Pg.1154]

CE is another versatile technique that can be applied in the determination of parabens in consumer products. CE operates in several modes including capillary zone electrophoresis (CZE), MEKC, nonaqueous capillary electrophoresis (NACE), and capillary electrochromatography (CEC) as well as others. Advantages shared by all these techniques are that the instrumentation is simple to operate and that they are cheaper than other separation techniques. Hence, CE is widely used in the determination of parabens in consumer products by different laboratories [19,20]. [Pg.187]