Lyophilization (also known as freeze-drying, sublimation) is a method of soft drying when the dried product (in our case fruits and berries) is frozen and then placed in a vacuum section, where sublimation takes place.
Sublimation is the transition of a substance from a solid state immediately to a gaseous one, without melting (transition to a liquid state).
The advantages of this drying method are the absence of exposure to high temperatures on the product, and the preservation of the dispersed phase of the product. The lyophilization method makes it possible to obtain dry products without loss of their structural integrity and biological activity. Freeze-dried products regain their original properties when moistened.