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The Cu/ZnO catalyst prepared by urea hydrolysis method was investigated for low-temperature methanol synthesis from syngas containing CO2. Concurrently, the activity of the conventional Cu/ZnO catalyst prepared by co-precipitation method was also compared. The effects of precipitation temperature, urea content, stirring speed and the introduction of Al on the catalytic performance of Cu/ZnO were deeply...
A simple and rapid micellar electrokinetic capillary chromatography (MEKC) method has been developed for the simultaneous determination of six lignans, schizandrin, Gomisin A, schisantherin A, deoxyschizandrin, schizandrin B and schizandrin C, in fruits of S. chinensis and S. sphenanthera. The key factors for separation and determination were studied and the best analysis conditions were obtained,...
To improve a capillary electrophoresis method used for the rapid and simultaneous separation and determination of rutin, chlorogenic acid and quercetin. The capillary column without coating (50μm×56cm, the used length: 47.5cm) was used, the solution of 12mM sodium tetraborate pentahydrate (pH 9.0) containing 15% methanol was taken as the running buffer and the temperature was 25 _. The linear relationship,...
The antioxidant activities of extracts and residuum of Herba Leonuri fruits from supercritical CO2 extraction were determined in vitro. The residuum was extracted in turn with water, propyl alcohol and ethyl acetate. The antioxidant activities of the extracts were assayed with antioxidant capacity in linoleic acid model system, reducing powers, radical scavenging activity using 1, 1-diphenyl-2-picrylhy-drazyl...
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