Study On Mechanism And Process Of Extracting Effectual Component From The Plant By Two-Step Of Release And Internal Boiling

In the phylogeny of Chinese traditional medicine, application of its extraction had a long history in our country, but many problems weren't solved such as old-dated extraction process, low extraction rate and so on. In order to increase ratio of effectual component in extraction succus and decrease production cost, it was necessary to apply modern techniques to research and analyze its extraction process.This paper put forward the extraction method of the two-step of release and internal evaporation of liquid. In Two-step, first, the plant was put into little releasable solvent. And then, after the effectual component in these materials was desorbed by releasable solvent adequately, boiling extraction solvent was added. The boiling extraction solvent was filtrated and separated and then the same process was undertaken to the sedimentation. The result showed that compared with extraction of traditional one, effectual component of Flos Lonicerae, Ginkgo biloba, Chinese cinnamon and Rhizoma Coptidis were extracted by this method, it had many advantages: the extraction time was shorter, the consumption of organic solvent was lower and the content of effectual component was higher and so on. Furthermore, compared with modern extracting methods such as microwave extracting method, this method obtained same extraction effect, but it reduced the equipments of extraction. Moreover, this method was easier to undertake in factory, so it had a good future in industrial application.In order to understand Two-step thoroughly, extraction temperature was changed to observe the effect of extraction. This paper studied the mechanism of Two-step extraction method. When temperature was around boiling point ofreleasable solvent, the extraction ratio had a break, and then the mechanism of internal evaporation of liquid was put forward. This method was that, when boiling hot solvent was poured into plant materials that was desorbed by releasable solvent, the releasable solvent inner the plant boiled before the diffusion of releasable solvent, the boiling caused inner convection and made effectual component to be extracted quickly out of the plant. As a result, the extraction speed quickened. By observing the phenomena in the process of the experiment, the bubble was produced inside the inner grain and then it lightened the density of the grain and slowed down sedimentation velocity.