微波动态循环阶段连续逆流提取二氢杨梅素

The process which microwave is applied to dynamic multi-stage countercurrent extraction,namely the process of microwave dynamic multi-stage countercurrent extraction (MDMCE),for extracting dihydromyricetin from Ampelopsis grossedentata was investigated.Comparison of MDMCE and microwave static batch extraction (MSBE) demonstrated that both the driving force of mass transfer and extraction efficiency of MDMCE were higher than those of MSBE.The optimum extraction conditions of 5 stages MDMCE obtained by orthogonal design were as follows:10 min extracting time for 5 stages MDMCE(2 min for every stage), 110 ℃, 1∶30 material to solvent ratio, 600 W microwave power. Under these conditions the extraction yield of dihydromyricetin and percentage of dihydromyricetin in residue were 92.2 % and 3.1% respectively. A kinetic model of single vessel for MDMCE was developed and the functional relation between dihydromyricetin concentration and extraction time was ln(ΔC)=0.2985lnt-12.52.

植物有效成分微波萃取的研究进展

本文较为全面地介绍了目前国内外微波萃取技术及其发展动态,包括微波萃取的机理分析、微波萃取设备、动态循环阶段连续逆流提取设备装置、微波在萃取植物有效成分方面的应用等。

电容层析成像系统敏感场的数学模型建立及快速计算

中药提取过程是一个典型的多相流过程,其提取过程中的容器温度,物料分布,饱和度等参数用常规方法探测较难,直接影响提取效率。本文尝试将电容层析成像技术应用到中药的提取工艺当中,以天然中药丹参和有机溶剂乙醇为研究对象,采用动态逆流循环提取工艺,提出了一种细化有限元单元边长的剖分和快速计算精确的电容值的方法,给出了改进方法的数学模型,将改进的方法应用到数学模型求解过程中,得出了符合实际应用物理系统的计算值,并对系统内两相流的变化规律对提取效率的影响进行分析。

中药水蛭提取及精制工艺的研究

目的:研究中药水蛭的提取及精制工艺,为水蛭提取物入制剂工艺提供技术依据。方法:依正交试验法,逆流循环提取技术,以效价法检测抗凝血酶活性为指标,对水蛭提取工艺进行优化,并运用膜分离技术对提取液进行精制。结果:最佳工艺为以12倍量0.9%氯化钠溶液提取5 h,循环3次最好,选择相对分子质量为30×103和0.5×103的膜即可达到精制的目的。结论:该提取、精制工艺稳定、合理、可行。