Results 191 to 200 of about 1,915 (220)

HSCCC-Tchebichef moment regression approach for enhanced quantification of oleuropein in olive leaf extracts

Journal of Chromatography A
Oleuropein, a major bioactive phenolic compound from olive leaves, has attracted considerable interest for its health benefits. Targeted fractionation of oleuropein from crude extracts is hampered by the co-existence of numerous structurally similar metabolites, making conventional chromatographic separation inefficient. Here we describe, for the first
Jules Muhire, Fu-xin Zhang, Bao-qian Liu, Jinxia Hu, Xiaofang Wang, Dong Pei, Duo-Long Di   +6 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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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
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High Speed Countercurrent Chromatography/Fourier Transform Infrared (HSCCC/FT-IR) Spectrometry

SPIE Proceedings, 1985
High Speed Countercurrent Chromatography/Fourier transform infrared (HSCCC/FT-IR) spectrometry is present-ed. High solute-to-solvent ratios can be obtained in separations performed using HSCCC. At these high solute concentrations it is possible to obtain spectra of solutes without solvent elimination, even in the presence of polar solvents, such as ...
Rodolfo J. Romanach, James A. de Haseth
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A simple method to optimize the HSCCC two‐phase solvent system by predicting the partition coefficient for target compound

Journal of Separation Science, 2008
AbstractA simple method was developed to optimize the solvent ratio of the two‐phase solvent system used in the high‐speed counter‐current chromatography (HSCCC) separation. Some mathematic equations, such as the exponential and the power equations, were established to describe the relationship between the solvent ratio and the partition coefficient ...
Quan-Bin, Han, Lina, Wong, Nian-Yun, Yang, Jing-Zheng, Song, Chun-Feng, Qiao, Hillary, Yiu, Yoichiro, Ito, Hong-Xi, Xu   +7 more
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Isolation and Purification of Highly Polar Antioxidants from Chirita longgangensis by Combination of Macroporous Resin and HSCCC

Chromatographia, 2014
An efficient and simple method to isolate and purify highly polar antioxidants from the antioxidant active site of Chirita longgangensishas been established. Firstly, the antioxidant active site was enriched with D101 macroporous resin, and then high-speed counter-current chromatography (HSCCC) was used with the two-phase solvent system ethyl acetate ...
Wenjuan Duan, Aiying Bai, Xiaojing Lin, Lei Fang, Xiao Wang   +4 more
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Uncovering the Power of HSCCC: Separation of Diastereomeric and Regioisomeric Styrylpyrones from the Stem Bark of Goniothalamus leiocarpus

Journal of Natural Products
The plant Goniothalamus leiocarpus of the Annonaceae family is used as an alternative medicine in tropical regions. Applying high-speed counter current chromatography (HSCCC), eight new bioactive styrylpyrone isomers, including 6R,7S,8R,2'S-goniolactone B (1), 6S,7S,8S,2'S-goniolactone B (2), 6R,7R,8R,2'S-goniolactone B (3), 6R,7S,8S,2'S-goniolactone C
Xiao Liu, Ling-Yun Li, Zhi-Qin Zhang, Xiu-Chuan Fu, Rong-Sheng Li, Jia-Li Yao, Simon Gibbons, Qing Mu   +7 more
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Combination of HSCCC and Sephadex LH-20 methods

Journal of Chromatography B, 2008
Changjun Yang, Daxiang Li, Xiaochun Wan
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Isolation of bioactive diterpenes from Tetradenia riparia by HSCCC

Planta Medica, 2012
GG Leitão, F de S Figueiredo, SWRM Dantas, A von Groll, RSF Silva, PE Almeida da Silva   +5 more
openaire   +1 more source