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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Dehydration, freeze‑drying, and pickling reduce water activity or lower pH to inhibit microbial growth in vegetables.
Origin: Ancient civilizations (Ancient to modern) — Global
See full technique reference →Dehydration removes water through heat, lowering a_w to ≤0.6 and preventing bacterial and fungal metabolism. Freeze‑drying sub‑freezes and sublimates water at –40 °C, achieving a_w < 0.1 while preserving volatile flavor compounds. Pickling acidifies the product (pH ≈ 2.8–3.5) and, when combined with high salt or sugar, creates osmotic stress that suppresses spoilage microbes.
Primary Reaction
Water activity reduction and acidification
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