New PDF release: Advances in Chromatography: Volume 41

By Phyllis R. Brown, Eli Grushka

ISBN-10: 0824705092

ISBN-13: 9780824705091

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

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Additional info for Advances in Chromatography: Volume 41

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Sample is injected via a normal type or microinjection valve [127,141–144]. Also, automatization via the use of an (HPLC) autosampler is reported [37,125,145]. In Fig. 14 the separa- Fig. 14 CEC separation of phenylthiohydantoin amino acids with gradient elution. 55) gradient; voltage 10 kV; photometric detection at 210 nm; solutes in order of elution: formamide, PTH-asparagine, PTH-glutamine, PTH-threonine, PTH-glycine, PTH-alanine, PTH-tyrosine, PTH-valine, PTH-proline, PTH-tryptophan, PTH-phenylalanine, PTH-isoleucine, PTH-leucine.

2), differences in the linear flow velocity in the chromatographic bed and in the open section have to be taken into account. In the chromatographic bed the mobile phase takes up only a fraction ϕM of the inner capillary volume. Hence, the velocity of the mobile phase in the open section equals veo in the chromatographic bed multiplied by ϕM. The corrected linear velocity in the chromatographic bed can be calculated using Eq. 5 [26]. veo (corrected) ϭ Lb ϩ Lo /ϕM t0 (5) where Lb ϭ length of the chromatographic bed, Lo ϭ length of the open section between the end of the chromatographic bed and the Fundamentals of Capillary Electrochromatography / 11 detection window, and t 0 ϭ migration time of the nonretarded marker.

With these phases it might be possible to transfer directly a method that has been developed for HPLC onto CEC. The selectivity of the separation system may be altered by varying the stationary phase. Those stationary phases that have been used in the reversed-phase mode in HPLC should be applicable in CEC provided that their surface properties permit the generation of a sufficiently high electroosmotic velocity [82,83]. Some workers have tested successfully chiral stationary phases designed for HPLC in the CEC mode [84–90].

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


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