1) anti-solvent precipitation for protein with compressed pressure
超(近)临界CO2
2) near-critical CO2
近临界CO2
1.
By using a sound speed measurement device composed of probe and CTS-3600 digital ultrasonic velocity measurement,ultrasonic propagation characteristic in near-critical CO2 has been studied.
采用由声速测量探头与CTS-3600数字式超声探伤仪组成的声速测量装置,对超声波在近临界CO2中传播特性进行了研究。
3) supercritical CO_2
超临界CO2
1.
Zanthoxylum oil is extracted with supercritical CO_2 and encapsulated by spray drying(using a coaxial nozzle).
研究了超临界CO2萃取花椒油,并直接采用同轴喷嘴喷雾干燥制备微胶囊。
2.
This paper discusses the phase behavior of supercritical CO_2-alkyd resin-200#, the mimic gasoline ternary system, showing that it is feasible for supercritical CO2to be used in the spray of alkyd varnish with quickly volatilized solvent.
考察了超临界CO2-醇酸树脂-200#汽油拟三元体系相行为,结果表明:用超临界CO2为快挥发性溶剂进行醇酸清漆喷涂是可行的。
3.
To simulate the solubility data of solids in supercritical CO_2 well,the solubility data of 30 kinds of solids in supercritical CO_2 were simulated by using the back-propagation artificial neural networks(BPANN).
为了更好地模拟超临界CO2(SC CO2)中固体的溶解度数据,采用逆向传播神经网络(BPANN)对30种固体在超临界CO2中的873个溶解度数据进行了模拟,所得相对误差(AARD)都在10%以下,小于状态方程和经验方程的值,此结果表明BPANN能较好地模拟SC CO2中固体的溶解度数据。
4) supercritical carbon dioxide
超临界CO2
1.
Lycopene was extracted from tomato using supercritical carbon dioxide method.
采用超临界CO2萃取技术从番茄果实中提取番茄红素。
2.
The cell morphology of the microcellular polypropylene(PP) foams prepared by supercritical carbon dioxide was studied.
研究了应用超临界CO2技术制备微孔聚丙烯时发泡条件和聚丙烯(PP)的熔体强度对微孔形貌的影响。
3.
Porous alumina material was prepared with activated carbon as template and aluminum acetylacetonate as precursor in supercritical carbon dioxide (SC-CO2).
在超临界CO2中以活性炭为模板,乙酰丙酮铝为前驱体制备了氧化铝多孔材料。
5) supercritical CO_(2)
超临界CO2
1.
The experimental materials of 30% and 95% andrographolide were used to investigate the crystallization characteristics of andrographolide during supercritical CO_(2) extraction.
以穿心莲内酯中间体为试验原料,考察了超临界CO2萃取穿心莲内酯过程中结晶的特性,并采用高效液相色谱法对结晶产物的纯度测试,同时采用X射线衍射法考察了晶体的晶型变化规律。
2.
For the high-speed developing technology of supercritical CO_(2) extraction since recent thirty years, this paper summarizes its typical craft flows, and compared the advantages and disadvantages of those craft flows, which provides references for the similar studies.
针对近30年来迅猛发展的超临界CO2萃取技术,总结了其典型工艺流程,并进行了分类比较,指出了各种工艺流程的优、缺点,为同类研究提供了参考;接着探讨了其在中草药研究中的主要优点、应用现状,以及今后我国中草药走向国际市场需要解决的关键问题。
3.
The essential oils were obtained by supercritical CO_(2)extraction and hydrodistillation from lavender.
利用超临界CO2萃取技术和水蒸气蒸馏法提取熏衣草精油,用GC-MS技术对其进行化学成分分析,分别鉴定出34种和29种化合物,占出峰物质总数的95。
6) supercritical CO 2
超临界CO2
1.
The oxidation system of TS1/H 2O 2 was investigated with the introduction of supercritical CO 2.
对超临界CO2 条件存在时TS - 1/H2O2 氧化体系进行了研究。
2.
Micronization of ethyl cellulose was obtained from a solution of ethyl cellulose in acetone by areosol solvent extraction system using supercritical CO 2 (ASES).
通过溶剂超临界CO2 雾化萃取法制得了乙基纤维素微粒 。
3.
The result showed that there was synchronous gradient crystallization of andrographolide in supercritical CO 2 extraction,moreover,the higher the pressure,the smaller and shorter the crystal shape.
鉴于天然产物中活性成分含量低 ,结晶性组分易堵塞管道等问题 ,本文以 30 %穿心莲内酯浸膏原料为例 ,通过超临界CO2 萃取结晶技术来提高穿心莲内酯晶体的含量。
补充资料：超临界萃取
超临界萃取所用的萃取剂为超临界流体，超临界流体是介于气液之间的一种既非气态又非液态的物态，这种物质只能在其温度和压力超过临界点时才能存在。超临界流体的密度较大，与液体相仿，而它的粘度又较接近于气体。因此超临界流体是一种十分理想的萃取剂。
超临界流体的溶剂强度取决于萃取的温度和压力。利用这种特性，只需改变萃取剂流体的压力和温度，就可以把样品中的不同组分按在流体中溶解度的大小，先后萃取出来，在低压下弱极性的物质先萃取，随着压力的增加，极性较大和大分子量的物质与基本性质，所以在程序升压下进行超临界萃取不同萃取组分，同时还可以起到分离的作用。
温度的变化体现在影响萃取剂的密度与溶质的蒸汽压两个因素，在低温区（仍在临界温度以上），温度升高降低流体密度，而溶质蒸汽压增加不多，因此，萃取剂的溶解能力时的升温可以使溶质从流体萃取剂中析出，温度进一步升高到高温区时，虽然萃取剂的密度进一步降低，但溶质蒸汽压增加，挥发度提高，萃取率不但不会减少反而有增大的趋势。
除压力与温度外，在超临界流体中加入少量其他溶剂也可改变它对溶质的溶解能力。其作用机理至今尚未完全清楚。通常加入量不超过10％，且以极性溶剂甲醇、异丙醇等居多。加入少量的极性溶剂，可以使超临界萃取技术的适用范围进一步扩大到极性较大化合物。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条