Results 171 to 180 of about 19,209,961 (222)

Establishing carbon dots assisted high speed countercurrent chromatography and its application for efficient separation of rare earth element ions.

Journal of Chromatography A
Rare earth elements with unique magnetic properties and optical properties, known as the 'industrial vitamin', has a very high commercial value. As a secondary resource of rare earth elements, low-concentration solution includes mixed rare earth ions ...
Wen-Ting Li, Wenjuan Wang, Yun Wei
semanticscholar   +1 more source

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
openaire   +4 more sources

Rapid screening and target-guided isolation of antioxidants from German chamomile by 2,2-diphenyl-1-picrylhydrazyl-ultra-high-performance liquid chromatography-mass spectrometry coupled with off-line two-dimensional high-speed countercurrent chromatography.

Journal of Separation Science
German chamomile is one of the most effective herbal elements used in anti-allergic products and as an antioxidant. Herein, the antioxidant activity of different extract fractions of German chamomile was initially evaluated using an off-line 2,2-diphenyl-
Wenle Su, Shujing Jiang, Qi Liu, Conghao Sun, Xiao-Qing Chen   +4 more
semanticscholar   +1 more source

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

Comparison of Different High-Speed Countercurrent Chromatography Injection Modes for the Separation of Glabridin.

Journal of Separation Science
In this work, different injection modes (single injection, overlapping injection, and continuous injection) of countercurrent chromatography were used and compared for the isolation and purification of glabridin from the crude extract of Glycyrrhiza ...
Sheng-Bing Wang, Kun Yang, Xingcui Wang, Shu Li, Ning-li Wang, Dong Pei, L. Pu, Xin-Yi Huang   +7 more
semanticscholar   +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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source