Question

Write notes on food preservation methods.

Answer 1

Food preservation methods food preservation slows spoilage, controls microorganisms and enzymes, and extends shelf life.

1. Heat treatment: Pasteurisation of milk and sterilisation destroy harmful microorganisms.
2. Refrigeration and freezing: Low temperatures slow microbial and enzymatic activity.
3. Drying or dehydration: Removing moisture limits microbial growth.
4. Preservatives: Sugar preserves jams and jellies; salt, spices and oil help preserve pickles. Permitted chemical preservatives are used only within prescribed limits.
5. Radiation: Controlled irradiation can extend the shelf life of certain foods, such as potatoes, onions, fruits and spices.