RESUMEN
Objective: To investigate the stability of superfine powder of Fritillariae Thunbergii Bulbus (FTB), Gastrodiae Radix (GR), and Rhodiolae Crenulateae Radix et Rhizoma (RCRR). Methods: The superfine powder of FTB, GR, and RCRR was prepared and stored at room temperature for 12 months. We investigated the powder characteristics for the particle size, powder morphology, specific surface area, bulk density, and angle of repose. Furthermore, the content and in vitro dissolution of effective ingredients were quantified to evaluate the stability of superfine powder of FTB, GR, and RCRR. Results: After storing at room temperature for 12 months, there were little differences between the superfine powder in physicochemical characteristics. The effective ingredient content of superfine powder was essentially unchanged and the in vitro dissolution rate curve remained the same. Conclusion: After storing at room temperature for 12 months, the stability of FTB, GR, and RCRR superfine powder is good, which provides the experimental references for the further study of the superfine powder of Chinese materia medica.