Results 241 to 250 of about 19,880 (279)

Separation of salidroside from Rhodiola crenulata by high-speed counter-current chromatography

Journal of Chromatography A, 2002
High-speed counter-current chromatography (HSCCC) was used to purify salidroside from an extract of Rhodiola crenulata with two steps using a two-phase solvent system composed of ethyl acetate-n-butanol-water (1:4:5, v/v) in the first run and chloroform-methanol-isopropanol-water (5:6:1:4) in the second run.
Xiao, Han, Tianyou, Zhang, Yun, Wei, Xueli, Cao, Yoichiro, Ito   +4 more
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Improved method for continuous uv monitoring in high-speed counter-current chromatography

Journal of Chromatography A, 1989
Continuous UV monitoring of the effluent in high-speed counter-current chromatography often encounters difficulty mainly due to the thermolabile nature of the mobile phase which tends to develop turbidity in the flow cell under a slight shift of the ambient temperature.
H, Oka, Y, Ito
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Separation and purification of 10-deacetylbaccatin III by high-speed counter-current chromatography

Journal of Chromatography A, 1998
High-speed counter-current chromatography (HSCCC) was used for the separation and purification of 10-deacetylbaccatin III from the needle extract of Chinese yew (Taxus chinensis). The crude needle extract (500 mg/5 ml) was first separated with a two-phase solvent system composed of n-hexane-ethyl acetate-ethanol-water (2:5:2:5, v/v) and the partially ...
X, Cao, Y, Tian, T Y, Zhang, Y, Ito
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Preparative separation of grape skin polyphenols by high-speed counter-current chromatography

Food Chemistry, 2016
To develop an efficient method for large preparation of various individual polyphenols from white grape skins (Fernão Pires; Vitis vinifera) by preparative high-speed counter-current chromatography (HSCCC) and preparative-HPLC, an optimized preparative HSCCC condition with two-phase solvent system composed of Hex-EtOAc-H2O (1:50:50, v/v) was used to ...
Lanxin, Luo, Yan, Cui, Shuting, Zhang, Lingxi, Li, Yuanyuan, Li, Peiyu, Zhou, Baoshan, Sun   +6 more
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Separation of alkaloids from herbs using high‐speed counter‐current chromatography

Journal of Separation Science, 2011
AbstractAlkaloids represent a most widespread group of bioactive natural products. Because of their alkalinity and structural diversity, the fractionation and purification of the alkaloids from herbs can often present a number of practical difficulties using the conventional chromatographic techniques.
Lei, Fang, Yuqin, Liu, Bin, Yang, Xiao, Wang, Luqi, Huang   +4 more
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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

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
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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
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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
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