This Presentation describes how food is spoiled

1. Vigyan Ashram Pabal

2. Why does the food spoil?
 When is food spoilt: - we keep bread or chapattis
in free air for few days’ .A fungi or sponge growth
is seen on i.e. black or white colour?
 We keep any food after cooking in copper pot or
milk in free air for long time period it get spoilt
because of bacterial affection or metallic
reaction.


3. Food Spoilage factor
 Some enzymes occur in food .Food get spoilt
mainly due to the presence of microorganisms,
enzymes, insect, worm and rats.
The spoilage factor
 Presence of micro organism
- Micro organism required moisture and air it
rapidly grow.

4. Growth of Microorganisms

5. Microorganisms
 Microorganisms are commonly called microbes
 Bacteria are also types of Microorganisms
 Microorganisms are spread everywhere
 Microorganisms are useful ones and also harmful ones

6. Enzymes
 Presence of enzymes:
- Enzymes are chemical substances found in all plants
and animals.
- If we keep green mango in grass its color changes
green to yellow and after it changes in black spot on it.
- This due to continue action of enzymes.

7. Why Food Preservation
necesacary?
 Some time we see that small insect or worm occur in
dal or rice or in any grain .
 They eat the food grains and convert it in to powder .
 Such food is unfit to human.

8. Principles of Food Preservation

9. Summary
 Factors responsible for spoiling food
 Enzymes
 Microorganisms or Bacteria