Results 221 to 230 of about 40,178 (259)

Solvent selection guide for counter-current chromatography

Journal of Chromatography A, 1991
Abstract Thirteen two-phases counter-current chromatography solvent systems (five not previously described for high-speed counter-current chromatography) were evaluated for relative polarity by using Reichardt's dye to measure solvachromatic shifts and by using solubility of index compounds.
Thomas P. Abbott, Robert Kleiman
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Advantages of a small-volume counter-current chromatography column

Journal of Chromatography A, 2009
Counter-current chromatography (CCC) works with a support-free liquid stationary phase. This allows for preparative separations and purifications. However, there are serious technical constraints because of the need to keep a liquid stationary phase in a column. Centrifugal fields are used.
Alain, Berthod, Svetlana, Ignatova, Ian A, Sutherland   +2 more
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Counter-current chromatography: Simple process and confusing terminology

Journal of Chromatography A, 2011
The origin of counter-current chromatography is briefly stated, followed by a description of the mechanism of elution of solutes, which illustrates the elegance and simplicity of the technique. The CCC retention equation can be mentally derived from three facts; that a substance with a distribution coefficient of 0 elutes at the mobile phase solvent ...
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Thin layer chromatography and counter-current analysis in porphyrias

British Journal of Dermatology, 1975
The porphyrin metabolism of 100 patients with porphyria and 351 of their relatives has been studied. Thin layer chromatography of methyl esters of the urinary porphyrin was undertaken in sixty-six patients with different types of porphyria, and forty-five relatives, seventeen patients with hepatic cirrhosis, three patients with lead poisoning and ...
J P, Aguadé, C, Herrero, J, Almeida, S G, Smith, R V, Belcher   +4 more
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Spiral counter‐current chromatography: Design, development, application, and challenges

Journal of Separation Science, 2016
Depending on the rapid growth in the radial gradient of the centrifugal force, spiral counter‐current chromatography can greatly improve the retention of stationary phase, especially for the aqueous two‐phase systems with ultra‐polar and high viscosity that are not well retained in the conventional multilayer coils counter‐current chromatography.
Xin-Yi, Huang, Xiao-Ming, Sun, Dong, Pei, Duo-Long, Di   +3 more
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How to achieve rapid separations in counter-current chromatography

Journal of Chromatography A, 2006
A new generation of high performance coil planet centrifuges is now making it possible to realize the enormous potential of liquid-liquid partition chromatography for the rapid and predictable scale up of separation processes. This paper uses a separation of flavonoids to demonstrate how rapid fractionations can be obtained at high flow rates with ...
Lijuan, Chen, Ian A, Sutherland
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Modelling counter-current chromatography: a chemical engineering perspective

Journal of Chromatography A, 2002
In conventional chromatography, a solute is usually viewed to be longitudinally transported only in the mobile phase, remaining longitudinally motionless in the stationary phase. In counter-current chromatography, both phases undergo intense mixing in the variable force field of a coil planet centrifuge and longitudinal dispersion of matter in the ...
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Counter-current chromatography

Journal of Chromatography A, 1987
Ian A. Sutherland, Deborah Heywood-Waddington, Yoichiro Ito   +2 more
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Droplet counter-current chromatography of anthocyanins

Journal of Chromatography A, 1984
G W, Francis, O M, Andersen
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Latest Trends on the Future of Three-Dimensional Separations in Chromatography

Chemical Reviews, 2021
Noor Abdulhussain, Suhas Nawada, Peter J Schoenmakers   +2 more
exaly