Results 211 to 220 of about 40,178 (259)

Chiral separation by counter-current chromatography

TrAC Trends in Analytical Chemistry, 2015
Counter-current chromatography (CCC) is a new, efficient, productive chromatographic technique based on continuous liquid-liquid partition. Recently, it attracted more attention in chiral separation due to its high load capacity, cheap liquid stationary phase and low solvent consumption, when compared to traditional chiral separation techniques.
Xin-Yi Huang, Duo-Long Di
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Modelling counter-current and dual counter-current chromatography using longitudinal mixing cell and eluting counter-current distribution models

Journal of Chromatography A, 2007
Two well known approaches are considered to analyze the processes of counter-current and dual counter-current chromatography: the longitudinal mixing cell model and the Craig's counter-current distribution model. The cell model represents perfectly mixed, equally sized cells in series.
Artak E, Kostanyan, Vera V, Belova, Anatoly I, Kholkin   +2 more
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Enantioseparations in counter-current chromatography and centrifugal partition chromatography

Journal of Chromatography A, 2001
Examples of chiral separations in counter-current chromatography (CCC) and centrifugal partition chromatography (CPC) are not numerous, due to the difficulty of finding chiral selectors highly selective in the liquid phase as well as a combination of solvents that does not destroy the selectivity and retains the capacity to elute chiral isomers of ...
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A novel approach to modelling counter-current chromatography

Journal of Chromatography A, 2010
Literature lists a number of counter-current chromatography (CCC) models that can predict the retention time and to a certain extent the peak width of a solute eluting from a CCC column. The approach described in this paper distinguishes itself from previous reports by relating all model parameters directly to column dimensions and experimental ...
Hacer, Guzlek, Ines I R, Baptista, Philip L, Wood, Andrew, Livingston   +3 more
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Service life of counter-current chromatography coils

Journal of Chromatography A, 2007
A multilayer coil of PTFE tubing, which failed after being used each workday for about 3 years in a type J centrifuge, was examined. Two types of defects were found. One, called crazes, occurs throughout the coil and does not leak initially, but may eventually lead to a short, axially oriented slit.
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High-speed counter-current chromatography of apple procyanidins

Journal of Chromatography A, 2000
Apple procyanidins were separated by high-speed counter-current chromatography using a type-J multilayer coil planet centrifuge. Several two-phase solvent systems with a wide range of hydrophobicities from a non-polar hexane system to polar n-butanol systems were evaluated their performance in terms of the partition coefficient and the retention of the
Y, Shibusawa, A, Yanagida, A, Ito, K, Ichihashi, H, Shindo, Y, Ito   +5 more
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Analysis of new counter-current chromatography operating modes

Journal of Chromatography A, 2007
Some novel cyclic operating modes of counter-current chromatography have been suggested. Chromatographic separation processes with two zones of different partition coefficients and with extraction and scrubbing (washing) zones are mathematically described using the eluting counter-current distribution approach. Two possible cyclic modes of dual counter-
Artak E, Kostanian, Andrei A, Voshkin
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Recent progress in separation prediction of counter‐current chromatography

Journal of Separation Science, 2020
AbstractAs a liquid‐liquid partition chromatography, counter‐current chromatography has advantages in large sample loading capacity without irreversible adsorption, which has been widely applied in separation and purification fields. The main factors, including partition coefficient, two‐phase solvent systems, apparatus, and operating parameters ...
Yuru Guo, Shengqiang Tong, Keqing Zhang, Jizhong Yan   +3 more
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Continuous counter-current extraction on an industrial sample using dual-flow counter-current chromatography

Journal of Chromatography A, 2009
Both batch and continuous separations were performed on an industrial liquor using a specially built continuous counter-current extraction centrifuge. Changing the flow regime for different batch separations showed that the elution of components from the respective ends of the coil depends on the flow rates of both upper and lower phases.
Remco, van den Heuvel, Ben, Mathews, Stephane, Dubant, Ian, Sutherland   +3 more
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Axial dispersion coefficient in high-speed counter-current chromatography

Journal of Chromatography A, 2009
Experimental measurements of axial dispersion coefficients in high-speed counter-current chromatography have been carried out in the single-phase and two-phase modes. Axial dispersion coefficients were calculated from the residence time distribution curve (or the elution profile).
Zhao, Chun-Xia, Xua, Ya-Lan, He, Chao-Hong   +2 more
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