Results 261 to 270 of about 2,527,192 (329)

Supercritical fluid CO2 extraction of three polymethoxyflavones from Citri reticulatae pericarpium and subsequent preparative separation by continuous high-speed counter-current chromatography.

Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 2019
Polymethoxyflavones (PMFs) are widely found in Citri Reticulatae Pericarpium (CRP) and have been investigated with a broad spectrum of biological activities as well as health promoting properties.
T. Long, Xiaojian Lv, Yin Xu, Guliang Yang, Lan-Ying Xu, Shiming Li   +5 more
semanticscholar   +1 more source

Semi-preparative separation of dihydromyricetin enantiomers by supercritical fluid chromatography and determination of anti-inflammatory activities.

Journal of Chromatography A, 2019
Dihydromyricetin, extracted from Ampelopsis grossedentata, has been widely used as one of Chinese health products in recent years. However, limited chiral separation method hinders the studies of pharmacological and pharmacokinetic activity differences ...
Yuemei Lin, Jun Fan, Lijun Ruan, Jingjie Bi, Yilun Yan, Tai Wang, Hao Gao, X. Yao, K. Cheng, Weiguang Zhang   +9 more
semanticscholar   +1 more source

Chiral lumazines: Preparation, properties, enantiomeric separation

Chirality, 1994
AbstractOptically active lumazines (biolumazine, dictyolumazine, monalumazine, and neolumazine) are prepared from the corresponding pterins by enzymatic reaction, using pterin deaminase excreted by Dictyostelium discoideum. The fluorescence properties, circular dichroism spectra, and chromatographic behavior of these lumazines are studied.
R, Klein, I, Tatischeff, G, Tham, N, Mano   +3 more
openaire   +2 more sources

Preparative-scale isoelectric trapping enantiomer separations

Journal of Chromatography A, 2003
The new Gradiflow BF200 IET unit, developed for isoelectric trapping protein separations has been modified and used to carry out preparative-scale enantiomer separations. Hydroxypropyl beta-cyclodextrin was used as the chiral resolving agent to induce an isoelectric point difference between the enantiomers.
Evan, Shave, Gyula, Vigh
openaire   +2 more sources

Preparative separation of quercetin, ombuin and kaempferide from Gynostemma pentaphyllum by high-speed countercurrent chromatography.

Journal of Chromatographic Science, 2019
An efficient method for the preparative separation of quercetin, ombuin and kaempferide from Gynostemma pentaphyllum by high-speed countercurrent chromatography (HSCCC) was successfully developed for the first time.
Conglei Pan, Haitao Lü
semanticscholar   +1 more source

Preparative separation of tetrahydrofurfurylamine enantiomers

Russian Journal of Organic Chemistry, 2007
Tetrahydrofurfurylamine enantiomers were separated on a preparative scale by fractional crystallization of diastereoisomeric salts with natural L-tartaric acid. (R)-Tetrahydrofurfurylamine was isolated in 68% yield with an optical purity of more than 98.5% according to the HPLC data.
D. M. Musatov, V. S. Kublitskii, O. R. Malyshev, D. V. Kurilov, M. G. Vinogradov   +4 more
openaire   +1 more source

Preparative separations using optical chromatography

SPIE Proceedings, 2007
Optical Chromatography, used for particle separation, involves loosely focusing a laser into a fluid flowing opposite the direction of laser propagation. When microscopic particles in the flow path encounter this beam they are trapped axially along the beam and are pushed upstream from the laser focal point to rest at a point where the optical and ...
Alexander Terray, Jonathan Arnold, Steven D. Sundbeck, Tomasz A. Leski, Sean J. Hart   +4 more
openaire   +1 more source

Preparative separation of the flavonoid fractions from Periploca forrestii Schltr. ethanol extracts using macroporous resin combined with HPLC analysis and evaluation of their biological activities.

Journal of Separation Science, 2019
A preparative separation method using macroporous absorptive resin coupled with high-performance liquid chromatography was developed for the separation of six fractions of the 80% ethanol extract of Periploca forrestii Schltr.
Huaguo Chen, Qian Liang, Xin Zhou, Xinyue Wang   +3 more
semanticscholar   +1 more source

Techniques in Preparative Chiral Separations

ChemInform, 2001
AbstractFor Abstract see ChemInform Abstract in Full Text.
Pilar Franco, Cristina Minguillon
openaire   +1 more source

An efficient method for the preparative separation and isolation of ginkgolic acids from the sarcotesta of Ginkgo biloba L by pH-zone-refining counter-current chromatography coupled with inner-recycling mode

Industrial crops and products (Print), 2018
An efficient method for the preparative separation and isolation of ginkgolic acids (GAs) from the sarcotesta of Ginkgo biloba L was developed by combining pH-zone-refining counter-current chromatography (PZRCCC) with inner-recycling mode.
Daijie Wang, Heng Zhu, Min Li, Xiangyun Song, Huijiao Yan, Jinqian Yu, Xiao Wang   +6 more
semanticscholar   +1 more source