Results 201 to 210 of about 9,540 (245)

Separation of lac dye components by high-speed counter-current chromatography

Journal of Chromatography A, 1998
High-speed counter-current chromatography has been successfully applied to the separation of the lac dye components. A 25-mg quantity of the sample was separated using a two-phase solvent system composed of tert.-butyl methyl ether-n-butanol-acetonitrile-water (2:2:1:5).
H, Oka, Y, Ito, S, Yamada, T, Kagami, J, Hayakawa, K, Harada, E, Atsumi, M, Suzuki, M, Suzuki, H, Odani, S, Akahori, K, Maeda, H, Nakazawa, Y, Ito   +13 more
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Practical approach to high-speed counter-current chromatography

Journal of Chromatography A, 1991
Abstract Counter-current chromatography (CCC0 is mainly used in the preparative separation, extraction and purification of samples. CCC does not operate with a solid stationary phase. Two immiscible liquid phases are used. One is the liquid mobile phase and the other is the liquid stationary phase.
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Separation of ivermectin components by high-speed counter-current chromatography

Journal of Chromatography A, 1996
Abstract High-speed counter-current chromatography (HSCCC) has been successfully applied to the separation of the ivermectin components. A 25-mg quantity of the sample was separated using a two-phase solvent system of n -hexane-ethyl acetate-methanol-water (19:1:10:10, v/v).
Hisao Oka, Yoshimoto Ikai, Junko Hayakawa, Ken-ichi Harada, Mokoto Suzuki, Atsuko Shimizu, Tomoko Hayashi, Kazue Takeba, Hiroyuki Nakazawa, Yoichiro Ito   +9 more
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Separations of flavonoids and alkaloids in medicinal herbs by high-speed counter-current chromatography

Journal of Chromatography A, 1988
Counter-current chromatography is a new liquid-liquid partition chromatography without using solid support. Recently, the technique has been remarkably improved in both partition efficiency and separation time. In this paper the capability of this high-speed counter-current chromatography was demonstrated on separation of two sets of samples obtained ...
T Y, Zhang, D G, Cai, Y, Ito
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Preparative separation of cacao bean procyanidins by high-speed counter-current chromatography

Journal of Chromatography B, 2016
In this work, an efficient method for preparative separation of procyanidins from raw cacao bean extract by high-speed counter-current chromatography (HSCCC) was developed. Under the optimized solvent system of n-hexane-ethyl acetate-water (1:50:50, v/v/v) with a combination of head-tail and tail-head elution modes, various procyanidins fractions with ...
Lingxi, Li, Shuting, Zhang, Yan, Cui, Yuanyuan, Li, Lanxin, Luo, Peiyu, Zhou, Baoshan, Sun   +6 more
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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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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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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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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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