Results 161 to 170 of about 4,005 (216)

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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Development of High-Speed Countercurrent Chromatography

2021
The preparative capability of the multilayer coil has been demonstrated in the separation of 1 g of the DNP amino acid mixture under the optimal operational conditions determined by the preliminary studies on short coils as described above. These centrifuge schemes are equipped with a novel flow-through mechanism which entirely eliminates the need for ...
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Analytical High Speed Countercurrent Chromatography

Journal of Liquid Chromatography, 1988
Abstract The resolution of countercurrent distribution has long been demonstrated. However, the long elution time limits its analytical applications. The development of a high speed planet centrifuge has markedly improved the efficiency of the system; thus the countercurrent chromatography can be completed within several hours instead of days.
Y.-W. Lee, Y. Ito, Q.-C. Fang, C. E. Cook   +3 more
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Retention of the stationary phase for high‐speed countercurrent chromatography

AIChE Journal, 2007
AbstractHigh‐speed countercurrent chromatography (HSCCC) is an emerging technique for preparative purification of a wide variety of solutes. Retention of the stationary phase is a crucial variable which is used for the derivation of the column efficiency, peak resolution, and solute retention.
He, Chao-Hong, Zhao, Chun-Xia
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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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Mass transfer and separation criteria for high‐speed countercurrent chromatography

AIChE Journal, 2011
AbstractHigh‐speed countercurrent chromatography (HSCCC) is a versatile technique for preparative separations of a wide variety of solutes. For optimization of operating conditions, prediction of separations, and scale‐up study, a model is needed to describe the effluent concentration profile, which determines the separation efficiency (mass transfer ...
Zhao, Chun-Xia, He, Chao-Hong
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Purification of Curcumin, Demethoxycurcumin, and Bisdemethoxycurcumin by High-Speed Countercurrent Chromatography

Journal of Agricultural and Food Chemistry, 2008
Curcuminoids are substances of great interest because of their important pharmacological activities, particularly anti-inflammatory, anticarcinogenic, and anti-Alzheimer's activities. In this study, we report the first procedure and effect of processing for the high, efficient, and useful purification of curcumin, demethoxycurcumin, and ...
Koichi, Inoue, Chihiro, Nomura, Sumio, Ito, Akito, Nagatsu, Tomoaki, Hino, Hisao, Oka   +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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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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