By Thomas E Beesley; Raymond P W Scott
ISBN-10: 0585352690
ISBN-13: 9780585352695
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Extra info for Chiral chromatography
Sample text
E: Page 38 Thus: and: Note that (V m ) is the volume of mobile phase in the column and not Vo the total dead volume of the column. Consequently, in practice: Both (V m ) and (V S ) will vary between different columns and may vary between different solutes, due to the differing exclusion properties of solid stationary phases and supports. Thus, some caution must be shown in comparing (k') values for the same solute from different columns and for different solutes on the same column. e. e. the distance in centimeters on the chart, between the injection point to the dead point on the chromatogram, or the equivalent time interval as measured by the computer).
5 The Separation of the Enantiomers of Dihydrobenzoin at Different Resolution Monitored by the PDR Chiral Detector and the UV Detector Courtesy of PDP-Chiral Inc. The separation was carried out on a A Cyclodextrin-1 2000 AC column. 4); separation A, 10/90 v/v, B, 30/70 v/v, C, 50/50 v/v and D pure methanol. The upper set of chromatograms were monitored by the chiral detector and the lower by a UV detector at 254 nm. It is seen that when the enantiomers are will separated (chromatogram (A)) the positive a negative peaks accurately Page 10 follow the profile produced by the UV detector.
In most cases, retention has both "energetic" and "entropic" components which, by careful adjustment, can be made to achieve very difficult and subtle separations. For example, if, as a result of its unique configuration, one enantiomer can interact more close with the surface, and in doing so come closer to an energetically interacting group, both the enthalpy and entropy of the distribution will be changed. As a consequence, the separation of one isomer from its corresponding enantiomer will be achieved by both energetic and entropic contributions to the standard free energy of distribution.
Chiral chromatography by Thomas E Beesley; Raymond P W Scott
by David
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