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Read e-book online Advances in Chromatography: Volume 41 PDF

By Phyllis R. Brown, Eli Grushka

ISBN-10: 0824705092

ISBN-13: 9780824705091

An updated reference, delivering an leading edge viewpoint on breakthroughs in separation technological know-how, equivalent to reverse-phase HPLC, advances in hyphenation, and linear dependence of relative retention values at the nature of the service gasoline and common column strain in gas-liquid chromatography.

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4 µm. 5 to 50 µm. In their studies, the electroosmotic velocity was virtually independent of the particle diameter. 5-µm diameter) synthesized by means of a modified Sto¨ber process, Lu¨dtke et al. [22] proved the applicability of packings with such fine material in CEC. The electroosmotic mobility observed with these packings is not significantly reduced compared to packings with material of larger mean particle diameter. Regarding the plate-height equation for a packed column (pressure-driven mobile phase) [23–25], H ϭ 2λp dp ϩ 2γ DM (1 ϩ 6k ϩ 11k 2 )d 2p 8kd 2F ϩ v v ϩ v 24(1 ϩ k) 2 Dm π 2 (1 ϩ k) 2 Ds (4) where H ϭ height of a theoretical plate, λp ϭ packing factor, dp ϭ mean particle diameter, γ ϭ labyrinth factor, v ϭ linear velocity of mobile phase, DM ϭ diffusion coefficient in the mobile phase, k ϭ retention factor of solute, dF ϭ effective film thickness of the stationary phase, and DS ϭ diffusion coefficient in the stationary phase, the tremendous impact of the mean particle diameter on the chromatographic efficiency obtainable with a given column is obvious.

The properties of final frits keeping the stationary phase in place determine the mechanical stability of the packed columns and their liability to bubble formation. Frits are discussed as major sources of extracolumn band broadening. These problems make it very desirable to construct fritless capillary columns for CEC. The production of fritless capillary columns for CEC has been the object of very active research in the last years. Highly swollen cross-linked hydrophobic hydrogels or rigid monoliths have been prepared in fusedsilica capillaries by in-situ synthesis, tapers have been used as an alternative to frits [97,98], and monoliths have been prepared by converting conventionally packed columns into ones with monolithic structure.

55] even demonstrated for CEC the applicability of mobile phases that do not contain added buffer salts. A separation of 11 polycyclic aromatic hydrocarbons was performed in under 13 min by CEC with an acetonitrile/water mobile phase. Whitaker and Sepaniak [56] separated fullerenes by CEC with a packed column and acetonitrile/ tetrahydrofuran or acetonitrile/methylene chloride as mobile phase. Working with mobile phases of extremely low specific electric con- 26 / Pyell ductivity might even make it possible to work in CEC with microbore columns and to perform highly efficient semipreparative separations.

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

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