In biology, there is a difference between using a high-temperature dryer or a freeze dryer. Our traditional method is to use a high-temperature dryer. Scientifically speaking, we need to decide which way to use according to the actual application.
The freeze dryer is suitable for drying bacteria, viruses, plasma, serum, antibodies, vaccines, medicines, microorganisms, yeast, and plant extracts for biological research. If the tissues and tissues with sensitive biological characteristics are preserved, freeze-drying is the best method. Use freeze-drying to store products that are easily dehydrated. After adding water, the characteristics of the raw materials can be restored again without affecting their biological activity. It is also suitable for drying at a very low temperature. The protein remains anhydrous, while the other main chemical bonds remain unchanged. Through freeze-drying, materials such as tissues, tissue extracts, bacteria, vaccines and plasma become dry. State so that no enzymatic, bacterial and chemical changes will occur.
The disadvantage of the traditional high-temperature dryer is that it will cause the material to shrink and destroy the cells. The structure of the sample will not be destroyed during the freeze-drying process, because the solid components are supported by the ice on its seat. As the ice sublimates, it will leave pores in the dry residue. This preserves the integrity of the product's biological and chemical structure and its activity.