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Aug 21, 2018

1, many heat sensitive substances will not be denatured or inactivated;

2. When drying at low temperature, some volatile components in the material are lost little;

3. During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot be carried out, so that the original traits can be maintained;

4, since the drying is carried out in a frozen state, the volume is almost constant, the original structure is maintained, and no concentration phenomenon occurs;

5. Since the moisture in the material exists in the form of ice crystals after pre-freezing, the inorganic salt-dissolved substances originally dissolved in the water are evenly distributed in the materials;

6. The material after drying in the freeze dryer is porous and spongy. After adding water, the solution dissolves quickly and completely, and the original trait is almost immediately restored;

7, because the drying is carried out under vacuum, there is very little oxygen, so the freeze dryer protects some easily oxidizable substances.