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超临界流体萃取技术是一种利用超临界流体作为提取分离介质的萃取技术,已在食品、制药行业得到广泛的应用,但其在中药研究开发方面的应用却鲜有报道。对超临界流体萃取技术的原理、特性进行介绍,综述该技术在中药有效成分的提取、分离及纯化方面的研究情况,对其在中药研究开发中的优越性进行归纳总结,并展望其在中药研究开发中的应用前景,为超临界萃取技术用于中药的研究与开发提供借鉴。 相似文献
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本文论述了超临界萃取中药提取在中药产业化形势及应用新技术的意义,超临界CO2流体萃取新技术在中药提取分离中的应用及其优越性。同时阐述了超临界CO2流体萃取技术在中药提取分离及中药现代化中的应用方式及前景。 相似文献
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超临界CO_2萃取技术在中草药开发中的应用进展 总被引:12,自引:2,他引:12
分析了我国中药发展的形势及其应用新技术的必要性 ,论述了超临界CO2 萃取技术在我国中草药开发中应用的现状及优越性 ,提出了如何应用超临界CO2 萃取技术进行中药开发的对策与展望。 相似文献
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介绍了超临界流体萃取的原理,综述了超临界流体萃取技术在中药提取中的应用。指出了日前存在的主要问题和今后发展的趋势,该技术为中药的发展提供了广阔的前景。 相似文献
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超临界二氧化碳萃取技术 总被引:1,自引:0,他引:1
超临界流体萃取(Supercritical Fluid Extraction)技术是一种新型的化工分离技术.本文综述了超临界流体萃取技术的发展.超临界流体的特性,介绍了超临界二氧化碳萃取技术在中草药,食品工业,香料工业和环保技术方面的应用,并对超临界二氧化碳萃取技术的现状和前景进行了分析. 相似文献
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超临界萃取对中草药有效成分分离的最新进展 总被引:1,自引:0,他引:1
本文从超临界技术的发展,原理及其特点、难点和简单工艺流程等几方面做了介绍,综述了超临界流体萃取在中草药有效成分分离提取中的最新进展,评价了该技术的优缺点,并对今后的超临界技术萃取中草药有效成分的发展趋势进行了展望。 相似文献
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Min Jeong Noh Eun Sun Choi Seon Hee Kim Ki-Pung Yoo Young Hae Choi Young Won Chin Jinwoong Kim 《Korean Journal of Chemical Engineering》1997,14(2):109-116
For arbitrarily chosen thirty types of natural resources which have been widely used in oriental traditional herb medicine,
supercritical CO2 extraction (SFE) and organic liquid solvent extraction (LSE) withn-hexane, chloroform and methanol were carried out to extract pharmaceutical substances. To evaluate relative advantages and
shortcomings between the SFE and LSE, five types of bioactivity assays as well as gas- and thin layer-chromatographic analysis
were performed for all the extracts obtained by the two extraction methods. Types of bioassays performed included cytotoxicity,
bleb forming, DNA binding, oxygen free radical scavenger and Xanthine oxidase inhibitor tests. To evaluate economic viability
of the SFE over the traditional LSE, extractability of prodrug substances was evaluated as the functions of extraction temperature
and pressure. SFE was proven to be a feasible alternative over LSE. Also, the optimum SFE conditions which provided maximum
extraction and cytotoxicity for each selected sample were presented. 相似文献
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超临界萃取技术在生物碱提取中的应用进展 总被引:4,自引:0,他引:4
超临界流体萃取技术具有选择性好、收率高、工艺简单、操作条件温和、绿色环保等优点,已被广泛应用于中草药的提取分离中。以生物碱的生物活性分类,综述了超临界萃取技术在各种天然生物碱提取中的应用研究现况及其特点。针对超临界萃取技术在提取生物碱中的发展前景及目前所存在的问题进行分析讨论。结果表明,它能够有效地从植物中提取或分离出生物碱,且与其它的分离手段相结合将是天然药物生物碱今后的提取分离发展方向。 相似文献
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《分离科学与技术》2012,47(6):972-977
Supercritical carbon dioxide modified with acetonitrile and water for the extraction of indirubin and tryptanthrin from Folium Isatidis and the collection of these two bioactive ingredients by a spray mode are presented in this study. Two pumps, one for the addition of the modifier and the other for the transportation of CO2, were used for supercritical fluid extraction (SFE). This is a fast and environmentally-friendly approach for the production of herbal medicine. Compared to conventional solvent extraction, the yield of bioactive indirubin and tryptanthrin by this SFE process was approximately the same, but with a shorter process time and better protection of the environment. 相似文献
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《Journal of Adhesion Science and Technology》2013,27(2):255-265
Vanadium nitride (VN x ) thin films have attracted much attention for semiconductor integrated circuit (IC) packaging molding dies, and forming tools due to their excellent hardness and, thermal stability. VN x thin films with VN0.45, VN0.83, VN1.22, VN1.73, VN2.06 were prepared using a radio frequency (RF) sputter technique. The experimental results showed that the contact angle at 20°C increases with increasing nitrogen content of the VN x films, to 101.4° corresponding to VN1.73 and then decreased. In addition, the contact angles decreased with increasing surface temperature, because an increase of the surface temperature disrupts the hydrogen bonds between water and the films and the water gradually vaporizes. The total surface fee energy (SFE) at 20°C decreased with nitrogen content of the VN x films to 29.8 mN/m (VN1.73) and then increased. This is because a larger contact angle means weaker hydrogen bonding which results in a lower SFE. The polar SFE component had the same trend as the total SFE, but the dispersive SFE component had the opposite trend. The polar SFE component is also lower than the dispersive SFE component. This is because hydrogen bonds are polar. The total SFE, dispersive SFE and polar SFE of the VN x films all decrease with increasing surface temperature. This is because with increasing temperature, water evaporates from the surface, disrupting hydrogen bonds and hence increasing surface entropy. The film roughness has an obvious effect on the SFE and there is tendency for the SFE to increase with increasing film surface roughness. As a result the SFE and surface roughness can be expressed in terms of a simple ratio function. 相似文献