Advances in High Performance Countercurrent Chromatography Advances in High Performance Countercurrent Chromatography
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Synthesis of medronic acid monoesters and their purification by high-performance countercurrent chromatography or by hydroxyapatite
We achieved the synthesis of important medronic acid monoalkyl esters via the dealkylation of mixed trimethyl monoalkyl esters of medronic acid. Two methods were developed for the purification of medronic acid monoesters: 1) small scale (10-20 mg) purification by using hydroxyapatite and 2) large scale (tested up to 140 mg) purification by high-performance countercurrent chromatography (HPCCC).
متن کاملMedium-pressure Liquid Chromatography
Preparative HPLC 5}30 '20 2}20 0.01}1 High purity solvent required Higher resolution See also: II/Chromatography: Countercurrent Chromatography and High-Speed Countercurrent Chromatography: Instrumentation. Chromatography: Liquid: Countercurrent Liquid Chromatography. III/Alkaloids: Gas Chromatography; High-Speed Countercurrent Chromatography; Liquid Chromatography; Thin-Layer (Planar) Chromato...
متن کاملPreparative Isolation and Purification of Two Coumarins from Edgeworthia chrysantha Lindl by High Speed Countercurrent Chromatography
Two bioactive coumarins including 7-hydroxycoumarin (umbelliferone) and 7-hydroxyl-6-methoxy-3, 70-dicoumarylether (daphnoretin) were separated from the ethyl acetate extract of the stems of Edgeworthia chrysantha Lindl (E. papyrifera) by high speed countercurrent chromatography (HSCCC). The two-phase solvent system used was composed of n-hexane-ethyl acetate–methanol–water at an optimized volu...
متن کاملSeparation of catalpol from Rehmannia glutinosa Libosch. by high-speed countercurrent chromatography.
The bioactive iridoid component catalpol was successfully separated by high-speed countercurrent chromatography with high purity from the partially purified crude extract of Rehmannia glutinosa. A polar two-phase solvent system composed of ethyl acetate-n-butanol-water (2:1:3, v/v/v) was selected by thin-layer chromatography and run on a preparative scale where the lower aqueous phase was used ...
متن کاملDynamic Process Control (MControl®) for Countercurrent Polish Processes (MCSGP)
The Contichrom® CUBE Combined and Contichrom HPLC systems use batch and continuous periodic countercurrent (PCC) processes for purification of target proteins, peptides, and small molecules. Multicolumn Countercurrent Solvent Gradient Purification (MCSGP) is a unique PCC polishing process that provides superior yield and purity at high productivity. In order to keep the MCSGP process at an opti...
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تاریخ انتشار 2007