Freeze drying, also known as lyophilisation or cryodesiccation, is a low temperature dehydration process[1] that involves freezing the product, lowering pressure, then removing the ice by sublimation.[2] This is in contrast to dehydration by most conventional methods that evaporate water using heat.[3]
Freeze drying results in a high quality product because of the low temperature used in processing.[1] The original shape of the product is maintained and quality of the rehydrated product is excellent.[4] Primary applications of freeze drying include biological (e.g., bacteria and yeasts), biomedical (e.g., surgical transplants), food processing (e.g., coffee) and preservation.[1]
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