Extraction method for Chinese parasol tree bark tannin

Abstract

The invention provides an extraction method for Chinese parasol tree bark tannin. The extraction method comprises the following steps: first, a Chinese parasol tree bark raw material is crushed; second, the powder obtained from the first step is soaked in petroleum ether; third, filtration is carried out, filter residues are obtained, dried, added with clear water, heated, boiled and soaked repeatedly, filtration is carried out, the extraction solutions of repeated extraction are mixed; fourth, an excess 4% gelatin aqueous solution is added to the mixed extraction solution until precipitation no longer increases, the precipitation is obtained through filtration and dried; fifth, the dried solid powder obtained from the fourth step is subjected to soxhlet extraction with acetone until there is no response to ferric trichloride developing, acetone is recycled and the tannin component is obtained. Preferably, the final remaining filter residues in the third step can be directly extracted with organic solvents to prepare betulinic acid. The extraction method overcomes defects of the prior art, and takes full advantage of the raw materials. Various tannin components with pharmacological activity are extracted, the technology is simple and the method is suitable for production.

Description

technical field [0001] The invention relates to the technical field of extracting traditional Chinese medicines, in particular to a method for extracting tannin from sycamore bark. Background technique [0002] Tannin widely exists in the plant kingdom, and more than 70% of traditional Chinese medicine herbal medicines contain tannin compounds, especially in gymnosperms and dicotyledonous plants, tannin exists in the bark, wood, leaves, roots, fruits and other parts of plants , is especially common in bark. In the past ten years, due to the application of new technologies and methods, people have made great progress in the research on tannins in plants. In addition to discovering that they have antibacterial, anti-inflammatory, and hemostatic pharmacological activities, they have also been found to have anti-inflammatory properties. Mutation, anti-lipid peroxidation, scavenging free radicals, anti-tumor and anti-AIDS and other pharmacological activities, especially in anti-t...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many studies on extracting betulinic acid from the sycamore plant sycamore, but all ignore the tannin components in the bark, such as the method for extracting betulinic acid from the bark of the sycamore tree in Chinese patent application 201110083158.6, wherein water The mentioned part is removed as waste, resulting in waste