[Dynamic change of paeoniflorin content in root of Paeonia lactiflora growing at Duolun County, Inner Mongolia].

UNLABELLED: To explore the dynamic change of paeoniflorin content in root of Paeonia lactiflora. METHOD: The samples were collected and paeoniflorin content was determined by HPLC. RESULT: The results showed that the average content of paeoniflorin was the lowest at 3.05% in the roots collected in May, and during the fruit time it was rather high in August at 4.72%, and in September at 4.58%. The average content showed no significant differences during June to October. CONCLUSION: Wild plant of P. lactiflora might be collected for medical use during blooming stage until wilting stage.