动态连续阶段逆流提取工艺分析与研究

针对传统中药提取工艺中能耗物耗大、杂质多、效率低的状况,就药材中有效成分的扩散速率、溶剂、温度、压力、固体药材粒度与液体的流动等多角度对中药提取工艺进行探索和优化,提出了一种新型中药提取工艺———动态连续阶段逆流提取工艺.介绍了该新型工艺的工艺流程,并结合一般提取工艺做了详细的对比分析,归纳了工艺特点.

丹参动态阶段连续逆流提取工艺研究

目的:研究丹参动态阶段连续逆流提取工艺。方法:以丹参素钠、总酚酸含量及固形物收率为指标,对丹参动态阶段逆流提取温度、时间、溶剂用量、提取单元组数等技术参数进行筛选,并与普通温浸、煎煮法进行对比研究。结果:丹参动态阶段连续逆流提取在保证有效成分提取效果的情况下,溶媒用量较温浸法、煎煮法减少2/3,固形物量降低23.9%,同时低温提取有效防止了丹参酚酸类成分的降解或聚合。结论:为对热不稳定的丹参酚酸类有效成分的后续分离纯化创造有利条件。

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。