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High-Speed Counter-Current Chromatography Combined with Column Chromatography for Isolation of Methyllycaconitine from Delphinium pseudocyanthum 总被引:1,自引:0,他引:1
Preparative high-speed counter-current chromatography (HSCCC) combined with conventional column chromatography (CC) has been used for isolation and purification of methyllycaconitine from Delphinium pseudocyanthum. n-Hexane-ethyl acetate-methanol-water, 1:1:1:2 (v/v), was used as the solvent system for HSCCC. Separation of methyllycaconitine from an HSCCC fraction was successfully achieved by CC on silica gel using chloroform-methanol, 7:1 (v/v), as mobile phase. A total of 113.45 mg methyllycaconitine of purity >95% was obtained from 1.044 g extract of D. pseudocyanthum. Its structure was identified by MS and NMR. 相似文献
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Haiqing Wang Shujie PengZhongqiu Hua Xiang DongYu Wang Liang Dong 《Physica B: Condensed Matter》2011,406(22):4183-4187
The composite with the mole ratio of WO3 to Co2O3 being 3:1 was fabricated by the conventional solid-state reaction process. The electrical properties of the sample were measured at various ambient temperatures in a low electric field (E<200 V/mm). The results demonstrated that the electrical behavior of the composite was sensitive to the variation of the ambient temperature. As the temperature increased, the composite displayed negative differential resistance characteristic within the temperature range of about 50-130 °C. When the temperature was between 140 and 300 °C the composite exhibited sublinear electrical behavior where current rose more weakly than voltage, which is sharply unlike those in varistors. An obviously superlinear property, exploited in varistors, was observed at the temperature of 500 °C. The present results also suggested that the composite did not obey the Arrhenius law. The current-voltage (I-V) properties of the composite could be explained by the double p-n junction and Joule heat. 相似文献
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Preparative high-speed counter-current chromatography (HSCCC) combined with conventional column chromatography (CC) has been used for isolation and purification of methyllycaconitine from Delphinium pseudocyanthum. n-Hexane-ethyl acetate-methanol-water, 1:1:1:2 (v/v), was used as the solvent system for HSCCC. Separation of methyllycaconitine from an HSCCC fraction was successfully achieved by CC on silica gel using chloroform-methanol, 7:1 (v/v), as mobile phase. A total of 113.45 mg methyllycaconitine of purity >95% was obtained from 1.044 g extract of D. pseudocyanthum. Its structure was identified by MS and NMR.
相似文献
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