Results 191 to 200 of about 9,540 (245)
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Evaluation of different tubing geometries for high-speed counter-current chromatography
Journal of Chromatography A, 2001Different tubing geometries were evaluated for use in high-speed counter-current chromatography. Standard round tubing was compared to rectangular and twisted rectangular tubing. The number of theoretical plates for a standard anthocyanin mixture from black currant was determined for each experiment.
A, Degenhardt +3 more
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Journal of Chromatography A, 2020
Antioxidants play an essential role in human health, as they have been found to be capable of lowering the incidence of many diseases, such as cancer and angiocardiopathy. Currently, more attention is paid to natural antioxidants because of the possible insecurity of synthetic antioxidants.
Yuan Gong +6 more
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Antioxidants play an essential role in human health, as they have been found to be capable of lowering the incidence of many diseases, such as cancer and angiocardiopathy. Currently, more attention is paid to natural antioxidants because of the possible insecurity of synthetic antioxidants.
Yuan Gong +6 more
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Improved spiral disk assembly for high-speed counter-current chromatography
Journal of Chromatography A, 2003The spiral disk for type-J high-speed counter-current chromatography (HSCCC) has been improved by placing short segments of PTFE (tetrafluoroethylene) tubing into the channel at regular intervals. The best results were obtained with a four-channel spiral column using 600 spacers, which significantly improved stationary phase retention and partition ...
Yoichiro, Ito +4 more
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Journal of Chromatography A, 2001
High-speed counter-current chromatography was applied to the preparative separation and purification of naphthopyranone glycosides from a crude 70% ethanolic extract of the capitula of Paepalanthus microphyllus. The solvent system used was composed of water-ethanol-ethyl acetate-hexane (10:4:10:4, v/v).
dos Santos, L. C., Vilegas, Wagner
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High-speed counter-current chromatography was applied to the preparative separation and purification of naphthopyranone glycosides from a crude 70% ethanolic extract of the capitula of Paepalanthus microphyllus. The solvent system used was composed of water-ethanol-ethyl acetate-hexane (10:4:10:4, v/v).
dos Santos, L. C., Vilegas, Wagner
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A review of the hydrodynamics of high-speed counter current chromatography
2023This review outlines the current understanding of the flow behavior in high-speed counter-current chromatography (HSCCC). HSCCC has seen huge progress in modeling and predicting flow behavior, yet it still is not fully understood from a hydrodynamic perspective.
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Separation of rare earth elements by high-speed counter-current chromatography
Journal of Chromatography A, 1991Besides being widely used in electronic and glass industries, rare earth elements have recently been found to have important biological effects including the ability to stabilize and enhance interferon activity [J.J. Sedmak and S.E. Grossberg, J. Gen. Virol, 52 (1981) 195].
E, Kitazume, M, Bhatnagar, Y, Ito
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Preparative separation of pyrrolizidine alkaloids by high-speed counter-current chromatography
Journal of Chromatography A, 1996We have applied a high-speed counter-current chromatography (CCC) technique to the separation and purification of pyrrolizidine alkaloids from Amsinckia tessellata, Symphytum spp., Trichodesma incanum (Boraginaceae), and Senecio douglasii var. longilobus (Asteraceae).
R A, Copper +3 more
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Resolution of gram quantities of racemates by high-speed counter-current chromatography
Journal of Chromatography A, 1995Gram quantities of (+/-)-dinitrobenzoyl amino acids were separated by high-speed counter-current chromatography (CCC) using N-dodecanoyl-L-proline-3,5-dimethylanilide as a chiral selector (CS). Standard and pH-zone-refining CCC techniques were compared.
Y, Ma, Y, Ito, A, Foucault
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Separation of spiramycin components using high-speed counter-current chromatography
Journal of Chromatography A, 2000High-speed counter-current chromatography was successfully applied to the separation of the main components of spiramycin. A 25-mg quantity of sample was separated using a two-phase solvent system composed of n-hexane-ethyl acetate-methanol-water (3:6:5:5), and the fractions were analyzed by high-performance liquid chromatography and fast atom ...
H, Oka, K, Harada, M, Suzuki, Y, Ito
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Rapid separation of flavonoids by analytical high-speed counter-current chromatography
Journal of Chromatography A, 1988A commercial model of the analytical high-speed counter-current chromatography instrument was used for separation of flavonoids from a crude ethanol extract of dried fruits of sea buckthorn (Hippophae rhamnoides). Using a two-phase solvent system of chloroform-methanol-water (4:3:2), a five-fold increase in flow-rate of the mobile phase from 60 to 300 ...
T Y, Zhang +4 more
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