Isolation of quinoline alkaloids from three Choisya species by high-speed countercurrent chromatography and the determination of their antioxidant capacity
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چکیده
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Enrichment and determination of zinc by high-speed countercurrent chromatography.
The capability of high-speed countercurrent chromatography (HSCCC) has been investigated for enrichment and determination of metal ions at trace levels. Separation of selected divalent metal ions was performed using a small coiled column. A hexane solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPA) was employed as the stationary phase. Loaded divalent metal ions such as Ni, C...
متن کاملCountercurrent Chromatography and High Speed Countercurrent Chromatography: Instrumentation
Engelsma M, KokWT and Smit HC (1990) Selective determination of trace levels of phenol in river water using electrochemical concentration modulation. Journal of Chromatography 506: 201}210. Fister JC, Jacobson C and RamseyM (1999) Ultra sensitive cross correlation electrophoresis on microdevices. Analytical Chemistry 71: 4460}4464. Kaljurand M and KuK llik E (1989) Computerized Multiple Input C...
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 کاملarchitecture and engineering of nanoscale sculptured thin films and determination of their properties
چکیده ندارد.
15 صفحه اولIsolation and Purification of Three Ecdysteroids from the Stems of Diploclisia glaucescens by High-Speed Countercurrent Chromatography and Their Anti-Inflammatory Activities In Vitro.
High-speed counter-current chromatography was used to separate and purify ecdysteroids for the first time from the stems of Diploclisia glaucescens using a two-phase solvent system composed of ethyl acetate-n-butanol-ethanol-water (3:0.2:0.8:3, v/v). Three ecdysteroids were obtained from 260 mg of ethyl acetate extract of the residue obtained after evaporation of the crude ethanolicextractof D....
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ژورنال
عنوان ژورنال: Revista Brasileira de Farmacognosia
سال: 2017
ISSN: 0102-695X
DOI: 10.1016/j.bjp.2017.01.003