Results 171 to 180 of about 4,005 (216)

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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Preparative isolation and purification of theaflavins and catechins by high-speed countercurrent chromatography

Journal of Chromatography B, 2008
High-speed countercurrent chromatography (HSCCC) has been applied for the separation of theaflavins and catechins. The HSCCC run was carried out with a two-phase solvent system composed of hexane-ethyl acetate-methanol-water-acetic acid (1:5:1:5:0.25, v/v) by eluting the lower aqueous phase at 2 ml/min at 700 rpm.
Kunbo, Wang, Zhonghua, Liu, Jian-an, Huang, Xinrong, Dong, Lubing, Song, Yu, Pan, Fang, liu   +6 more
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Isolation of Achyrobichalcone from Achyrocline satureioides by High- Speed Countercurrent Chromatography

Current Pharmaceutical Biotechnology, 2015
Achyrobichalcone is a biflavonoid recently found in Achyrocline satureioides. This substance has unprecedented chemical structure and occurrence, but resembles other bioactive bichalcones, which have important pharmacological properties, such as anticancer activity.
Juliana P, Carini, Gilda G, Leitão, Paulo H, Schneider, Cristiane C, Santos, Fernanda N, Costa, Maribete H, Holzschuh, Fábio, Klamt, Valquiria L, Bassani   +7 more
openaire   +2 more sources

Isolation of coffee diterpenes by means of high-speed countercurrent chromatography

Journal of Food Composition and Analysis, 2009
Abstract Many different physiological activities have been ascribed to coffee diterpenes, such as cholesterol increasing activity for the diterpenes kahweol and cafestol. Another member of this class, namely the diterpene 16-O-methylcafestol, is used as a marker substance for robusta coffee.
Heike Scharnhop, Peter Winterhalter
openaire   +1 more source

Recycling High-Speed Countercurrent Chromatography for Separation of Taxol and Cephalomannine

Journal of Liquid Chromatography & Related Technologies, 1998
Abstract A mixture of taxol and cephalomannine was subjected to recycling countercurrent chromatography (CCC) which allows the use of the same column for repetitive separation of the peak fractions to improve the peak resolution. When the total amount of 50 mg of the two components was recycled twice, peak resolution (Rs) increased from 0.7 to 1.27 ...
Q.-Z. Du, C.-Q. Ke, Y. Ito
openaire   +1 more source

Separation of Lanthanides by High-Speed Countercurrent Chromatography with Organophosphate Ester

Journal of Liquid Chromatography & Related Technologies, 1996
Abstract High-speed countercurrent chromatography is a recently developed separation method that has been remarkably improved in both separating efficiency and separation time. In this paper, this advanced countercurrent chromatographic method was applied to the separation of lanthanides. In combination with the measurement of the partition coefficient
Zhongming Ma, Xiaoxiang Zheng
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Preparation and Purification of Epigallocatechin by High‐Speed Countercurrent Chromatography (HSCCC)

Journal of Liquid Chromatography & Related Technologies, 2004
Abstract Epigallocatechin (EGC) was prepared by the degallation of Epigallocatechin‐O‐3‐gallate (EGCG). EGCG was completely converted to EGC and gallic acid by adding 4 mg tannase/100 mg EGCG at the concentration of 2 mg/mL under pH 6.0, at 35°C for 30 min.
Xueli Cao, Yoichiro Ito
openaire   +1 more source

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 Colistin A and B Using High-Speed Countercurrent Chromatography

Journal of Liquid Chromatography & Related Technologies, 1998
Abstract High-speed countercurrent chromatography was successfully applied to the isolation of colistin-A and colistin-B from a commercial colistin preparation. As the first step. TLC and HPLC analysis conditions for the colistin components were established.
Y. Ikai, H. Oka, J. Hayakawa, N. Kawamura, K. Harada, M. Suzuki, H. Nakazawa, Y. Ito   +7 more
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Separation of High Purity Przewaquinone A by High‐Speed Countercurrent Chromatography

Journal of Liquid Chromatography & Related Technologies, 2003
Abstract High‐speed countercurrent chromatography (HSCCC) was used to purify przewaquinone A from the extract of Salvia miltiorrhiza Bunge using a two‐phase solvent system composed of carbon tetrachloride–methanol–water–n‐hexane, at an optimum volume ratio of 3:3:2:1.
Xiao Han, Tianyou Zhang, Yoichiro Ito
openaire   +1 more source