Fst 151 food freezing food science and technology 151 Special topics: Freeze Drying


Effects of freeze drying on foods



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Freeze drying

Effects of freeze drying on foods

  • Advantages:
  • Very high retention of sensory characteristics and nutritional qualities and a shelf-life longer than 12 months when correctly packaged.
  • Aroma retention up to 80 – 100 %
  • The texture of freeze-dried foods is well maintained; little shrinkage and no case hardening.
  • The open porous structure allow a rapid and full re-hydration, but it is fragile and requires protection from mechanical damage.
  • Only minor changes to proteins, starches or other carbohydrates.
  • Disadvantage:
  • The open porous structure of the food may allow oxygen to enter and cause oxidative degradation of lipids (packaging in inert gas necessary).

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