WALT Know reasons for food spoilage. Know benefits of preserving food. Know some methods of preserving food.

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Presentation transcript:

WALT Know reasons for food spoilage. Know benefits of preserving food. Know some methods of preserving food.

What causes spoilage of food?

Three main groups of microbes that cause spoilage : Bacteria Moulds Yeasts Source :

Bacteria – on raw meat, raw fish, raw milk, Yeasts and acid/salt tolerant bacteria -on cured meat Yeasts and moulds -On butter, yoghurt, cheese, fruits, vegetables Moulds - On cereals, nuts,

Preservation of food ? Any ideas???

Which methods do you know?

Preservation of food Heating – pasteurisation, sterilising Cooling – refrigeration, freezing Chemicals – curing, pickling, fermentation, Sulphur dioxide, benzoic acid, ascorbic acid, propionic acid Drying Freeze drying Packaging Irradiation

Questions 1.Why does food go bad? 2.Which methods do you know? 3.Why do we use preservation methods?

Ham contains more vitamin C than a piece of fruit Vitamin C is also named ascorbic acid 137 milligrams 4 grams

Food preservation experiment Food gets mouldy after a while. That shows us that …

Mould, a problem for humans