02/11/2018
Vacuum Freeze -drying Vs Heat-treated dying
Vacuum Freeze-drying has the following advantages over heat-treated drying. 1. Many hot substances do not degenerate or deactivate. 2. When drying at low temperatures, some of the volatile components in the material are few lost. 3. During the lyophilization 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 concentration does not occur. 5. Since the moisture in the material exists in the form of ice crystals after pre-freezing, the inorganic salt-soluble substances originally dissolved in the water are evenly distributed in the material. When sublimating, the dissolved substances dissolved in water are precipitated, which avoids the phenomenon that the inorganic salt carried by the internal moisture migration to the surface in the general drying method is precipitated on the surface to cause surface hardening. 6. After drying, the material is loose and porous, and it is sponge-like. After adding water, it dissolves quickly and completely, and the original trait is almost immediately restored. 7. Since drying is carried out under vacuum, there is very little oxygen, so some easily oxidizable substances are protected. 8. Drying can eliminate 95%~99% of water, so that the products can be preserved for a long time without deterioration.
