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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
The first stage of freeze drying is to freeze the food in conventional freezing. equipment. Small pieces of food are frozen rapidly to produce small ice crystals and to. reduce damage to the cell structure of the food (Chapter 21). In liquid foods, slow.