Download Advances in Chromatography: Volume 41 by Phyllis R. Brown, Eli Grushka PDF

By Phyllis R. Brown, Eli Grushka

An up to date reference, delivering an cutting edge standpoint on breakthroughs in separation technology, resembling reverse-phase HPLC, advances in hyphenation, and linear dependence of relative retention values at the nature of the service gasoline and typical column strain in gas-liquid chromatography.

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The slurry of the packing material is prepared either in an organic solvent or in supercritical carbon dioxide [33]. Mostly the packing material is transported into the column with the help of an external pump. Reynolds et al. [79] and Fermier and Colo´n [80] used columns packed by centripetal forces. Electrokinetic packing was described by Yan [81]. In CEC the stationary phase not only provides interaction sites for the solutes, it also plays the dominant role in the generation of the electroosmotic flow, hence the propagation of the mobile phase through the chromatographic bed.

B. Efficiency The first works in CEC done with capillaries packed with octadecyl silica gel concentrated on progress in efficiency compared to HPLC via the use of very fine packing material (dp Յ 3 µm). These experiments have been made with neutral analytes in order to avoid electrophoretic effects. The maximum length of the packed bed is given not by the mechanical permeability of the packing but by the maximum voltage that can be applied between the ends of the capillary and by the electroosmotic mobility µeo.

Considerations above suggest that for the design of a robust separation capillary suitable for CEC at ambient pressure, it is important that the separation capillary be as homogeneous as possible over the full length in zeta potential and in the cross-sectional area of the inner volume of the capillary accessible to the mobile phase. It is important to note that these two constraints are idealy fulfilled with fritless capillaries filled completely with stationary phase. In this case, spectrometric detection has to be performed in the chromatographic bed (in-column detection).

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