Results 181 to 190 of about 1,915 (220)

One-Step Separation of Four Flavonoids from Herba Salviae Plbeiae by HSCCC

Journal of Chromatographic Science, 2014
High-speed countercurrent chromatography (HSCCC) was successfully applied to the isolation and purification of four flavonoids from Herba Salviae Plbeiae using stepwise and dual-mode elution with a pair of two-phase solvent systems. The systems composed of n-hexane-chloroform-methanol-water (0.5 : 4 : 3 : 2, v/v/v/v) and chloroform-methanol-water (4 ...
Jia, Li, Xiaoyong, Zhang, Qi, Yu, Xiaohui, Fu, Weina, Wang   +4 more
openaire   +2 more sources

147Nd quantification using HSCCC-purified samples

Talanta
Quantifying the fission product 147Nd in nuclear debris samples is an important component of post-detonation nuclear forensics. The most accurate quantifications are obtained when Nd is purified from all other fission products, actinides, activation products, and environmental matrix contained within the debris.
Alexander B. Weberg, Mateusz Dembowski, Nathan C. Smythe, Daniel Meininger, Susan J. Eaton, Alyssa-Marie N. Lucero, Jesse Murillo, Genevieve M. Patton, Jennifer M. White, Michael R. James, Randy J. Rendon, Jennifer R. Romero, George S. Goff, Susan K. Hanson, Iain May   +14 more
openaire   +2 more sources

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
openaire   +1 more source

Preparation of highly purified oleuropein by combinative technology off line of HSCCC‐PHPLC based on dual wavelength

Journal of Food Science, 2021
Abstract Oleuropein is the main active substance in foods or functional foods produced from olive ( Olea europaea L.) leaves. In the present study, the combinative technology off line of HSCCC‐PHPLC based on dual wavelength was used to separate ...
Ningli Wang, Dong Pei, Yewei Liu, Jianteng Wei, Xinyi Huang, Duolong Di   +5 more
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

Isolation and Identification of Phenolic Compounds in the Fruit of Benincasa hispida by HSCCC

Journal of Liquid Chromatography & Related Technologies, 2005
Abstract Separation of phenolic components from the fruit Benincasa hispida was conducted using high‐speed countercurrent chromatography (HSCCC) with two solvent systems, n‐hexane–n–butanol–methanol–water (10:16:5:20, v/v) and n‐hexane–ethyl acetate–methanol–water (1:1:1:1, v/v). Three compounds, astilbin (120 mg), catechin (103 mg), and naringenin (79 
Qizhen Du, Qi Zhang, Yoichiro Ito
openaire   +1 more source

HSCCC‐MS Study of Flavonoids in the Extracts from the Seeds of Oroxylum indicum

Journal of Liquid Chromatography & Related Technologies, 2005
Abstract In this study, two analytical high‐speed countercurrent chromatography (HSCCC) instruments, interfaced directly with electrospray ionization and atmospheric pressure chemical ionization mass spectrometry, were explored for the separation of a mixture of three standard flavonoids.
L. J. Chen, H. Song, D. E. Games, I. A. Sutherland   +3 more
openaire   +1 more source

Preparative HSCCC isolation of phloroglucinolysis products from grape seed polymeric proanthocyanidins as new powerful antioxidants

Food Chemistry, 2015
Polymeric proanthocyanidins isolated from a grape seed phenolic extract were hydrolysed in the presence of phloroglucinol into monomer catechins and their nucleophile derivatives. Each of the phloroglucinolysis products was successfully separated and isolated in large amount by semi-preparative HSCCC technique under the optimized conditions based on a ...
Shuting, Zhang, Yan, Cui, Lingxi, Li, Yuanyuan, Li, Peiyu, Zhou, Lanxin, Luo, Baoshan, Sun   +6 more
openaire   +2 more sources

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
openaire   +1 more source