Introduction： Vacuum freeze drying technology, also known as sublimation drying, is a method to pre-freeze water-containing material and sublimate its moisture under vacuum. The original biological and chemical properties of freeze-dried items are basically unchanged, which is easy to keep for a long time. After adding water, they can be restored to the state before freeze-drying and maintain their original biochemical properties. Therefore, vacuum freeze drying technology is widely used in food, chemical, biological products and other fields.
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