Partition Chromatography

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Partition Chromatography ( partition-chromatography )

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760 II / CHROMATOGRAPHY: LIQUID / Partition Chromatography (Liquid^Liquid) Figure 17 Contour plots of (A) CHPLC and (B) CEC separation of alkylbenzoates: 1, methyl; 2 ethyl; 3, propyl; 4, butyl; 5, pentyl benzoate; ACN, acetonitrile. (signal line width) at the height of the 13C signals must be further optimized. A further example is the online CE-NMR and online CEC-NMR separation of alkylbenzoates. Figure 17 shows the contour plot of the separation performed in the CHPLC and the CEC mode. It is evident from the CEC-NMR contour plot that all compounds are baseline-separated, resulting in dis- tinct NMR rows in the two-dimensional display. This example shows the great power of CHPLC, CE and CEC-NMR to derive unambiguous informa- tion of substances in complex organic molecules. The Rrst steps towards a high-throughput separation system have already been made. For the successful performance of real-life applications, NMR sensitiv- ity must be improved. If NMR probes with 1 ng sensitivity become available, an increasing number of capillary separations coupled with nanoscale NMR will be performed in many applications. See also: II / Chromatography: Supercritical Fluid: In- strumentation. Electrophoresis: Detectors for Capillary Electrophoresis. III/Carotenoid Pigments: Supercritical Fluid Chromatography. Gradient Polymer Chromato- graphy: Liquid Chromatography. Natural Products: Liquid Chromatography-Nuclear Magnetic Resonance. Pigments: Liquid Chromatography. Polyethers: Liquid Chromatography. Further Reading Albert K (1995) Journal of Chromatography A 703: 123}147. Albert K (1997) Journal of Chromatography A 785: 65}83. Braumann U, HaK ndel H, Albert K et al. (1995) Analytical Chemistry 67: 930}935. De Koenig JA, Hogenboom AC, Lacker T et al. (1998) Journal of Chromatography A 813: 55}61. Hatada K, Ute K, Kitayama T et al. (1989) Polymer Bull- etin 21: 489}495. Lindon JC, Nicholson JK and Wilson ID (1996) Progress in NMR Spectroscopy 29: 1}49. Pusecker K, Schewitz J, GfoK rer P et al. (1998) Analytical Chemistry 70: 3280}3285. Schlotterbeck G, Tseng L-H, HaK ndel H et al. (1997) 69: 1421}1425. Strohschein S, Schlotterbeck G, Richter J et al. (1997) Journal of Chromatography A 765: 207}214. Wu N, Peck TL, Webb AG et al. (1994) Analytical Chem- istry 66: 3849}3857. Partition Chromatography (Liquid^Liquid) C. Wingren and U.-B. Hansson, Introduction Lund University, Lund, Sweden Partition or liquid}liquid chromatography (LLC) is a powerful separation technique which has been suc- Copyright ^ 2000 Academic Press cessfully used for the separation and analysis of

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