Results 171 to 180 of about 3,973 (221)

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
openaire   +2 more sources

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

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
openaire   +2 more sources

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
openaire   +2 more sources

PREPARATIVE SEPARATION OF β-SITOSTEROL BY HIGH SPEED COUNTERCURRENT CHROMATOGRAPHY

Journal of Liquid Chromatography & Related Technologies, 2002
β-sitosterol was successfully separated and purified from both β-sitosterol standard (about 60% purity) and crude sterols using high-speed countercurrent chromatography (HSCCC) with a heptane–aceto...
Yujie Zhou, Fuming Chen, Zongcheng Li
openaire   +1 more source

Preparative separation of punicalagin from pomegranate husk by high-speed countercurrent chromatography

Journal of Chromatography B, 2007
Punicalagin, the main ingredient of pomegranate (Punica granatum L.) husk, is a high molecular weight polyphenolic compound. It has shown remarkable pharmacological activities attributed in the presence of dissociable OH groups. To isolate punicalagin, previous methods included labor intensive and expensive solid phase extractions by column ...
Jingjing, Lu, Yun, Wei, Qipeng, Yuan
openaire   +2 more sources

Separation of amaranthine-type betacyanins by ion-pair high-speed countercurrent chromatography

Journal of Chromatography A, 2014
Betacyanins, red-violet plant pigments, were fractionated by ion-pair high-speed countercurrent chromatography (IP-HSCCC) from leaves extract of Iresine lindenii Van Houtte, an ornamental plant of the family Amaranthaceae. An HSCCC solvent system consisting of TBME-1-BuOH-ACN-H2O (1:3:1:5, v/v/v/v) was applied using ion-pair forming heptafluorobutyric ...
Gerold, Jerz, Nadine, Gebers, Dominika, Szot, Maciej, Szaleniec, Peter, Winterhalter, Slawomir, Wybraniec   +5 more
openaire   +2 more sources

Laser-light-scattering detection for high-speed countercurrent chromatography

Journal of Chromatography A, 1991
High-speed counter-current chromatography (HSCCC) is a powerful separation technique increasingly used in natural products chemistry. Evaporative laser light-scattering detection (ELSD) represents a universal detection method based on the following principle: the eluate [e.g.
D E, Schaufelberger, T G, McCloud, J A, Beutler   +2 more
openaire   +2 more sources

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

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