Condensed tannins content and optimization of the extraction conditions of wild plants in Yanbian region

In this experiment, the contents of various types condensed tannins (CTs) in different Yanbian region wild plants were evaluated. Then the leaves of (Vicia amoena and Lespedeza hedysaroides) were further analyzed and the extraction progress of CTs from wild plants was optimized. The results showed that the CTs contents within different types plants were different and the average content ranged from 3.4 to 88.6 g·kg-1. When the solid to liquid ratio and extractive liquid ratio in extraction progress in V.amoena was adjusted to 1∶40 and 2∶2(L.hedysaroides was 1∶30 and 2∶3), the optimum extraction time was 4 hours.