Advances in Chromatography, Volume 46 by Grushka E. (ed.), Grinberg N. (ed.) PDF

By Grushka E. (ed.), Grinberg N. (ed.)

Quantity forty six contains new advances in two-dimensional fuel chromatography, reversed part liquid chromatography/shape selectivity, and supercritical fluid chromatography. The booklet highlights enantioselective separations with emphasis on chiral attractiveness mechanisms, screening techniques, and separation velocity. It additionally emphasizes hyphenated recommendations and stronger fluidity chromatography with emphasis on monolithic organo-silica hybrid columns. This quantity presents an exceptional start line for gaining speedy wisdom to the sphere of separation technology.

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Extra resources for Advances in Chromatography, Volume 46

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5 mm s−1 ) and having also about the same Hmin value (ca. 17 µm), the monolithic column outperformed the packed column at higher flow velocity owing to a flatter H/u-curve, that is, due to its smaller mass transfer resistance term (C-term). 3 ms for particulate and 3 ms for monolithic column). 5 better than with the particulate column at the same linear flow velocity. At higher flow rate, the gain in efficiency is even more pronounced. A side aspect was also demonstrated. If required, the column length and thus the peak capacity can be easily amplified by coupling several enantioselective monolithic columns in series [75].

The last (interrelation) term may indicate that the carbamate and amino acid residues interact with each other and therefore exert a mutual effect upon each other. 17). On the contrary, SO–SA pairs having residues with larger and smaller ES values give lower enantioselectivities. Overall, the tert-butyl carbamates of quinine and quinidine evolved as the most effective chiral selectors among this family because of their broad enantioselectivity spectrum and exceptional degree of selectivity for a wide variety of chiral acids.

The values in parenthesis of this QSPR equation indicate the 95% confidence interval of the estimated coefficients. From the statistical parameters it can be derived that this QSPR model is significant at the 99% confidence level. This QSPR equation has a physical meaning which is in agreement with the chromatographically derived tentative binding model that was further confirmed by spectroscopic investigations (vide infra). The separation factors first increase with larger amino acid and carbamate residues (accounted for by the second and fourth terms of the previous equation), probably due to a growing importance of Van der Waals type and/or dispersive interactions for complex stabilization of the second eluted enantiomer for which a similar QSPR equation is valid [59].

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Advances in Chromatography, Volume 46 by Grushka E. (ed.), Grinberg N. (ed.)

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