After the samples become freeze-dried preparations, they are more stable, especially for high temperature sensitive drugs, and most of them can be transported and stored at 0-4℃ or even normal temperature after freeze-dried, so the transportation and storage cost and inactivation risk are greatly reduced.
Compared with traditional drying methods, the bioactive materials can restore their pre-freeze-dried conformation and biological function after redissolution. Therefore, freeze-drying is the safest method with the least impact on the properties of the drying materials
