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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Vacuum freeze drying removes water from food by sublimating ice under low pressure, preserving heat‑sensitive nutrients and flavor.
Origin: NASA (1960s) — United States
See full technique reference →The process begins with rapid freezing of the product at temperatures between −30 °C and −80 °C, forming ice crystals smaller than 100 µm that maintain cellular structure. Under a vacuum of 0.1–1 mbar, the ice sublimates at 0–20 °C, bypassing the liquid phase and preventing Maillard browning. The resulting low water activity (<0.6) inhibits microbial growth while retaining volatile aroma compounds.
Primary Reaction
sublimation of ice to water vapor
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