Results 261 to 270 of about 132,429 (302)

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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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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