Results 161 to 170 of about 3,973 (221)

Chiral Separation by High-Speed Countercurrent Chromatography

Analytical Chemistry, 1995
Various parameters involved in the chiral separation of (+/-)-DNB-amino acids were investigated using N-dodecanoyl-L-proline-3,5-dimethylanilide as a chiral selector (CS) and two-phase solvent systems composed of hexane/ethyl acetate/methanol/10 mM hydrochloric acid at various volume ratios.
Y, Ma, Y, Ito
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High-speed countercurrent chromatography

Nature, 1987
Support-free high-speed countercurrent liquid chromatography provides a rich domain of applications, some beyond reach of conventional liquid chromatography.
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PURIFICATION OF YTTRIUM BY HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY

Journal of Liquid Chromatography & Related Technologies, 1999
Separation of rare earth elements has been studied by high– speed countercurrent chromatography (CCC) employing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester in toluene as a stationary phase. The CCC method was applied to purification of rare earth elements in a wide range of concentrations. High-purity yttrium was chromatographically isolated by
Shigeto Nakamura, Hiroyuki Hashimoto, Kenichi Akiba   +2 more
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Characterization of Pigments from Different High Speed Countercurrent Chromatography Wine Fractions

Journal of Agricultural and Food Chemistry, 2005
A red wine, made from Cabernet Sauvignon (60%) and Tannat (40%) cultivars, was fractionated by high speed countercurrent chromatography (HSCCC). The biphasic solvent system consisting of tert-butyl methyl ether/n-butanol/acetonitrile/water (2/2/1/5, acidified with 0.1% trifluoroacetic acid) was chosen for its demonstrated efficiency in separating ...
Salas, Erika, Dueñas, Montserrat, Schwarz, Michael, Winterhalter, Peter, Cheynier, Veronique, Fulcrand, Hélène   +5 more
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Concentration of Heavy Metals by High-Speed Countercurrent Chromatography

Journal of Liquid Chromatography & Related Technologies, 1998
Application of high-speed countercurrent chromatography (HSCCC) to the concentration of metal ions has been studied. The stationary phase, containing di(2-ethylhexyl) phosphoric acid (DEHPA) in n-heptane, was continuously fed into the column. The ppb level of metal ions in a 500 mL of the mobile phase was continuously concentrated into small volumes of
E. Kitazume, N. Sato, Y. Ito
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HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY USING A SMALL COILED COLUMN

Journal of Liquid Chromatography & Related Technologies, 2000
Separation of selected lanthanoid elements was performed by high-speed countercurrent chromatography (CCC) equipped with a small coiled column of a 10 cm3 capacity. A hexane solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPA) was retained in the tubing column as the stationary phase.
Akira Tsuyoshi, Hiroaki Ogawa, Kenichi Akiba, Harutaka Hoshi, Eiichi Kitazume   +4 more
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Isolation of Sceletium alkaloids by high-speed countercurrent chromatography

Phytochemistry Letters, 2011
Abstract The alkaloids of Sceletium tortuosum (Mesembryanthemaceae) exhibit important pharmacological properties and are used for the treatment of psychiatric and psychological conditions, including depression, anxiety, drug dependence, bulimia and obsessive-compulsive disorder.
Emmanuel Amukohe Shikanga, Alvaro Viljoen, Sandra Combrinck, Andrew Marston   +3 more
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Separation of heavy metals by high-speed countercurrent chromatography

Analytical Chemistry, 1993
Separation of heavy metal elements such as Co, Cu, Fe(II),Fe(III), Mg, and Ni was performed with a high-speed CCC coil planet centrifuge equipped with a multilayer coil. The two-phase solvent systems used for the separation were composed of n-heptane containing bis(2-ethylhexyl) phosphoric acid (stationary phase) and diluted citric acid (mobile phase),
Eiichi. Kitazume, Nobuyoshi. Sato, Yoshihiro. Saito, Yoichiro. Ito   +3 more
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Preparative Separation of Polyphenols from Tea by High-Speed Countercurrent Chromatography

Journal of Agricultural and Food Chemistry, 2000
High-speed countercurrent chromatography (HSCCC) was applied to the separation of polyphenols from tea leaves (Camellia sinensis L.). The capability of HSCCC to isolate pure tea polyphenols from complex mixtures on a preparative scale was demonstrated for catechins, flavonol glycosides, proanthocyanidins, and strictinin from green and black tea.
A, Degenhardt, U H, Engelhardt, C, Lakenbrink, P, Winterhalter   +3 more
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New Trichoverroids from Myrothecium verrucaria Isolated by High Speed Countercurrent Chromatography

Journal of Natural Products, 1992
Three new double-bond isomers of the trichothecene trichoverrins (3, 4a and 4b) have been isolated, principally through the use of high speed countercurrent chromatography, which proved to be a powerful tool in the separation of these closely related structural isomers.
B B, Jarvis, T, DeSilva, J B, McAlpine, S J, Swanson, D N, Whittern   +4 more
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