Comparison of drying methods for agricultural products applying in traditional medicine

Drying medicinal herbs is one of the necessary methods to maintain a stable quality of medicinal herbs. Currently, there are many methods of drying medicinal herbs, such as sun drying, freeze drying, infrared drying, ultrasonic drying, microwave drying, and convection drying. Each method produces different quality medicinal materials with advantages and disadvantages in productivity, product quality, energy costs, and applications. Therefore, the paper focuses on other methods of drying agricultural medicinal herbs with the above issues, such as a basis for scientists and manufacturing enterprises to choose appropriate drying methods.