Results 231 to 240 of about 19,880 (279)

Evaluation of different tubing geometries for high-speed counter-current chromatography

Journal of Chromatography A, 2001
Different 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, M, Schwarz, P, Winterhalter, Y, Ito   +3 more
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Improved spiral disk assembly for high-speed counter-current chromatography

Journal of Chromatography A, 2003
The 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, Fuquan, Yang, Paul, Fitze, Jimmie, Powell, David, Ide   +4 more
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Rapid separation of flavonoids by analytical high-speed counter-current chromatography

Journal of Chromatography A, 1988
A 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, R, Xiao, Z Y, Xiao, L K, Pannell, Y, Ito   +4 more
openaire   +2 more sources

Resolution of gram quantities of racemates by high-speed counter-current chromatography

Journal of Chromatography A, 1995
Gram 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
openaire   +2 more sources

Preparative separation of pyrrolizidine alkaloids by high-speed counter-current chromatography

Journal of Chromatography A, 1996
We 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, R J, Bowers, C J, Beckham, R J, uxtable   +3 more
openaire   +2 more sources

Separation of lac dye components by high-speed counter-current chromatography

Journal of Chromatography A, 1998
High-speed counter-current chromatography has been successfully applied to the separation of the lac dye components. A 25-mg quantity of the sample was separated using a two-phase solvent system composed of tert.-butyl methyl ether-n-butanol-acetonitrile-water (2:2:1:5).
H, Oka, Y, Ito, S, Yamada, T, Kagami, J, Hayakawa, K, Harada, E, Atsumi, M, Suzuki, M, Suzuki, H, Odani, S, Akahori, K, Maeda, H, Nakazawa, Y, Ito   +13 more
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Separation of ivermectin components by high-speed counter-current chromatography

Journal of Chromatography A, 1996
Abstract High-speed counter-current chromatography (HSCCC) has been successfully applied to the separation of the ivermectin components. A 25-mg quantity of the sample was separated using a two-phase solvent system of n -hexane-ethyl acetate-methanol-water (19:1:10:10, v/v).
Hisao Oka, Yoshimoto Ikai, Junko Hayakawa, Ken-ichi Harada, Mokoto Suzuki, Atsuko Shimizu, Tomoko Hayashi, Kazue Takeba, Hiroyuki Nakazawa, Yoichiro Ito   +9 more
openaire   +1 more source

Separations of flavonoids and alkaloids in medicinal herbs by high-speed counter-current chromatography

Journal of Chromatography A, 1988
Counter-current chromatography is a new liquid-liquid partition chromatography without using solid support. Recently, the technique has been remarkably improved in both partition efficiency and separation time. In this paper the capability of this high-speed counter-current chromatography was demonstrated on separation of two sets of samples obtained ...
T Y, Zhang, D G, Cai, Y, Ito
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Practical approach to high-speed counter-current chromatography

Journal of Chromatography A, 1991
Abstract Counter-current chromatography (CCC0 is mainly used in the preparative separation, extraction and purification of samples. CCC does not operate with a solid stationary phase. Two immiscible liquid phases are used. One is the liquid mobile phase and the other is the liquid stationary phase.
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Preparative separation of cacao bean procyanidins by high-speed counter-current chromatography

Journal of Chromatography B, 2016
In this work, an efficient method for preparative separation of procyanidins from raw cacao bean extract by high-speed counter-current chromatography (HSCCC) was developed. Under the optimized solvent system of n-hexane-ethyl acetate-water (1:50:50, v/v/v) with a combination of head-tail and tail-head elution modes, various procyanidins fractions with ...
Lingxi, Li, Shuting, Zhang, Yan, Cui, Yuanyuan, Li, Lanxin, Luo, Peiyu, Zhou, Baoshan, Sun   +6 more
openaire   +2 more sources