Advantages of freeze-drying compared to traditional drying methods:
1. Freeze drying consumes less heat.
2. Many heat sensitive substances do not undergo denaturation or deactivation.
3. During low-temperature freeze-drying, the loss of volatile components contained in the object is minimal.
4. During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot be carried out, so the original performance can be maintained.
5. Due to the fact that drying is carried out in a frozen state, the volume remains almost unchanged, maintaining the original structure and avoiding concentration.
6. Drying can remove over 95% to 99% of water, maintaining the original chemical composition and physical properties (such as porous structure, colloidal properties, etc.) of the dried material.
7. Due to the fact that drying is carried out under vacuum and there is little oxygen, it protects some easily oxidizable substances.
8. The dried material is loose, porous, and spongy. After encountering water, it can quickly restore its original characteristics.
