Results 181 to 190 of about 1,880 (204)

Preparative Isolation and Purification of Two Phenylpropanoids from Daphne giraldii Nitsche by HSCCC

Chromatographia, 2010
Preparative high-speed counter-current chromatography (HSCCC) was successfully applied to purify phenylpropanoids from the stem and root bark of Daphne giraldii Nitsche, a traditional Chinese medicine. Their structures were identified on the basis of 1H NMR and 13C NMR technology. The two-phase solvent system composed of n-hexane–ethyl acetate–methanol–
Feng-Yun Li, Zhan-Ping Gou, Xiao-Chi Ma, Yan Tian, Ge Tian, Chang-Yuan Wang, Dong-Hai Su, Ke Xin Liu, Xiu-Lan Xin   +8 more
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Separation and Purification of Three Flavonoids from Helichrysum arenarium (L.) Moench by HSCCC

Chromatographia, 2009
Following an initial clean-up step on a Sephadex LH-20 column, high-speed countercurrent chromatography was successfully applied to the isolation and purification of three flavonoids from a crude sample of Helichrysum arenarium (L.) Moench. HSCCC was performed with a two-phase solvent system composed of ethyl acetate–water (1:1, v/v).
Yi Yang, Yun Huang, Dongyu Gu, Abulimiti Yili, Gulnar Sabir, Haji Akber Aisa   +5 more
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PREPARATIVE ISOLATION AND PURIFICATION OF LUTONARIN AND SAPONARIN FROM BARLEY SEEDLINGS BY HSCCC

Journal of Liquid Chromatography & Related Technologies, 2012
In order to isolate large amounts of pure lutonarin and saponarin, a high performance method for isolation and purification of these two flavonoids from barley (Hordeum vulgare) seedlings was successfully established by utilizing high-speed counter-current chromatography (HSCCC). Separation was performed with a two-phase solvent system: ethyl acetate/n-
Tao Chen, Ping Wang, Yuzhi Du, Yuhu Shen, Yulin Li   +4 more
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Rapid and Simple Method for Quality Control of Raw Materials of Herbs by HSCCC

Journal of Liquid Chromatography & Related Technologies, 2007
Abstract The component of the traditional Chinese medicine (TCM) can be influenced by soils, climates, and growth stages. The quality of TCM mostly depends on the quality of the raw materials of the used herbs. A portable instrument and simple analysis method are urgently needed to be used for quality control of the raw herbs. In this study, analytical
Xiao Wang, Jianhua Liu, Tianyou Zhang, Yoichiro Ito   +3 more
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Gradient Elution for Triterpene Separation from Cecropia lyratiloba Miquel by HSCCC

Journal of Liquid Chromatography & Related Technologies, 2005
Abstract The triterpenoid pool from the dichloromethane fraction obtained from the methanolic extract of roots of Cecropia lyratiloba Miquel was submitted to CCC using a gradient elution consisting of Hex/EtOAc/MeOH/H2O—1/2/X/1 (X=0.5 (A); 0.75 (B); 1.0 (C); 1.5 (D); 2.0 (E)) in five steps.
Rodrigo R. Oliveira, Gilda G. Leitão, Michelle C. C. Moraes, Maria Auxiliadora C. Kaplan, Daise Lopes, Jorge P. P. Carauta   +5 more
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Hyphenated HSCCC–DPPH· for Rapid Preparative Isolation and Screening of Antioxidants from Selaginella moellendorffii

Chromatographia, 2008
A method for rapid preparative isolation and screening of antioxidants has been developed by combining preparative HSCCC with on-line radical scavenging detection by use of DPPH· (1,1-diphenyl-2-picrylhydrazyl) as model radical. The HSCCC effluent was split into two parts. The major part was collected and the rest was introduced, through a switch valve,
Shuyun Shi, Honghao Zhou, Yuping Zhang, Kelong Huang   +3 more
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Simultaneous Isolation and Purification of Mollugin and Two Anthraquinones from Rubia cordifolia by HSCCC

Chromatographia, 2008
A preparative high-speed countercurrent chromatography (HSCCC) method for isolation and purification of three bioactive components, tectoquinone; 1-hydroxy-2-methylanthraquinone and mollugin from the Chinese medicinal plant Rubia cordifolia was successfully established.
Rui Liu, Yanbin Lu, Tianxing Wu, Yuanjiang Pan   +3 more
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Preparation of Mevinolinic Acid from Monascus purpureus Using High‐Speed Countercurrent Chromatography (HSCCC)

Journal of Liquid Chromatography & Related Technologies, 2003
Abstract High‐speed countercurrent chromatography (HSCCC) was applied for the separation of a crude Monascus purpureus extract. The separation was carried out using a two‐phase solvent system composed of n‐hexane/ethyl acetate/methanol/water (1/1/1/1, v/v) at a flow rate of 1.0 mL/min.
Qizhen Du, Ming Xia, Yoichiro Ito
openaire   +1 more source

Structural Investigation of the Antibiotic Sporaviridin. XV. Preparative-Scale Preparation of Sporaviridin Components by HSCCC

Journal of Liquid Chromatography, 1990
Abstract Preparative-scale separation of the six sporaviridin components, very complicated basic glycoside antibiotics produced by Streptosporangium viridogriseum, was carried out by high speed countercurrent chromatography (HSCCC). The following two points, selection of proper solvent system and stationary phase retention, were carefully examined ...
Ken-Ichi Harada, Ikumi Kimura, Akiko Yoshikawa, Makoto Suzuki, Hiroyuki Nakazawa, Shigehiko Hattori, Kyoichi Komori, Yoichiro Ito   +7 more
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Preparative Isolation and Purification of Linderalactone and Lindenenol from Radix linderae by HSCCC

Journal of Liquid Chromatography & Related Technologies, 2006
Abstract A preparative high speed countercurrent chromatography (HSCCC) method for isolation and purification of sesquiterpene lactone compounds from the Chinese traditional medicinal herb Radix linderae (Wuyao in Chinese) was successfully established by using light petroleum‐ethyl acetate‐methanol‐water (5∶5∶6∶4, v/v) as the two phase solvent system ...
Qinghua Sun, Ailing Sun, Renmin Liu
openaire   +1 more source