Results 211 to 220 of about 9,540 (245)

Isolation and Purification of Ginkgo Flavonoids by High-Speed Counter-Current Chromatography

Advanced Materials Research, 2013
High-speed counter-current chromatography (HSCCC) was successfully used for isolation and purification of Ginkgo flavonoids from the Ginkgo biloba L. leaf extract (GBE) with a two-phase solvent system composed of n-hexaneethyl acetatemethanolwater at an optimized volume ratio of 4:6:5:5(v/v/v/v). The lower phase was used as the mobile phase in the head
Sang Sang Lu, Hui Song, Jing Zhi Miao, Shi Rong Tang   +3 more
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High-speed preparative counter-current chromatography with a coil planet centrifuge

Journal of Chromatography A, 1982
Abstract A compact table-top model of a flow-through coil planet centrifuge produces and efficient chromatagraphic separation of solutes on a preparative scale within 2–5 h. The use of a multi-layer coiled column promotes retention of the stationary phase with a high flow-rate of the mobile phase and permits almost universal application of ...
Yoichiro Ito, Jesse Sandlin, William G. Bowers   +2 more
openaire   +1 more source

Purification of paeoniflorin from Paeonia lactiflora Pall. by high-speed counter-current chromatography

Journal of Chromatography A, 2004
High-speed counter-current chromatography was successfully used for the first time for the preparative separation and purification of paeoniflorin from the Chinese medicinal plant Paeonia lactiflora Pall. using a two-phase solvent system composed of n-butanol-ethyl acetate-water (1:4:5, v/v) in a single run.
Chen, F, Lu, HT, Jiang, Y
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Separation and purification of isoflavones from Pueraria lobata by high-speed counter-current chromatography

Journal of Chromatography A, 1999
High-speed counter-current chromatography (HSCCC) was applied to the semipreparative separation and purification of puerarin and related isoflavones from a crude extract of Pueraria lobata. Analytical HSCCC was used for the preliminary selection of a suitable solvent system composed of ethyl acetate-n-butanol-water (2:1:3, v/v/v).
X, Cao, Y, Tian, T, Zhang, X, Li, Y, Ito
openaire   +2 more sources

Isolation of dammarane saponins from Panax notoginseng by high-speed counter-current chromatography

Journal of Chromatography A, 2003
The Chinese phytomedicinal formulation Sanqi Zongdai Pian, traditionally prepared from crude extracts from roots of Panax notoginseng (Araliaceae), contains highly polar dammarane saponins which were separated at a preparative scale using high-speed counter-current chromatography (HSCCC). In each operation, 283 mg methanolic extract of five tablets was
Qizhen, Du, Gerold, Jerz, Reiner, Waibel, Peter, Winterhalter   +3 more
openaire   +2 more sources

Preparative purification of anti-tumor derivatives of honokiol by high-speed counter-current chromatography

Journal of Chromatography A, 2008
In our program to synthesize a series of novel derivatives as potential analogs of honokiol for anti-tumor treatment, we have found that at least three of the derivatives of honokiol showed more potency to inhibit the proliferation of K562 leukemia cells and SPC-A1 adenocarcinoma cells.
Youfu, Luo, Yongbin, Xu, Lijuan, Chen, Houding, Luo, Cheng, Peng, Jia, Fu, Hongjing, Chen, Aihua, Peng, Haoyu, Ye, DaChun, Xie, Afu, Fu, Jianyou, Shi, Shengyong, Yang, Yuquan, Wei   +13 more
openaire   +2 more sources

[Separation of alkaloids in tea by high-speed counter-current chromatography].

Se pu = Chinese journal of chromatography, 2001
Alkaloids extracted from the green tea were separated by high-speed counter-current chromatography. A series of experiments have been performed to investigate effects of different solvent system. A system of CHCl3-CH3OH-NaH2PO4(23 mmol/L) = (4:3:2) was selected, in which the upper phase was used as the stationary phase, and the lower phase as mobile ...
L, Yuan, R, Fu, T, Zhang, J, Deng, X, Li
openaire   +1 more source

Isolation and purification of inflacoumarin A and licochalcone A from licorice by high-speed counter-current chromatography

Journal of Chromatography A, 2004
High-speed counter-current chromatography (HSCCC) technique in semi-preparative scale has been applied to isolate and purify bioactive flavone compounds from the ethanol extract of Glycyrrhiza inflata Bat., a particular plant species of licorice. HSCCC separation was performed with a two-phase solvent system composed of n-hexane-chloroform-methanol ...
Wang, QE, Lee, FSC, Wang, XR
openaire   +3 more sources

Isolation of hydroxycinnamoyltartaric acids from grape pomace by high-speed counter-current chromatography

Journal of Chromatography A, 2006
A method for the isolation of caftaric, coutaric and fertaric acids from grape pomace by high-speed counter-current chromatography (HSCCC) was developed. Using a system of hexane/ethyl acetate/methanol/water 3:7:3:7 (v/v/v/v) and 0.5% trifluoroacetic acid (TFA) in the head-to-tail elution mode, the target compounds were separated from co-extracted ...
Thorsten, Maier, Solveigh, Sanzenbacher, Dietmar R, Kammerer, Nicolai, Berardini, Jürgen, Conrad, Uwe, Beifuss, Reinhold, Carle, Andreas, Schieber   +7 more
openaire   +2 more sources

Scaling High-Speed Counter-Current Chromatography for Preparative Neodymium Purification: Insights and Challenges

Journal of Chromatography A
Efficient rare earth element (REE) separations are becoming increasingly important to technologies ranging from renewable energy and high-performance magnets to applied radioisotope separations. These separations are made challenging by the extremely similar chemical and physical characteristics of the individual elements, which almost always occupy ...
Alexander B. Weberg, Mateusz Dembowski, Quintin K. Blad, George S. Goff, Susan K. Hanson, Iain May   +5 more
openaire   +2 more sources