Food Preservation Flashcards
What preservation methods did people used to use more commonly than today?
Drying, Salt, Vinegar
What sort of preserved foods are available?
Dried, pickled, vacuum packed, canned and frozen food.
In commercial preservation, how do methods of preservation work to pro long the shelf life?
1.Destroying or retarding the action of enzymes (which cause food to go mouldy). 2.By preventing the growth of micro organisms, some of which produce harmful pathogens which can cause viruses and even death.
What are the main methods of destroying or retarding the action of enzymes or micro organisms?
- Removing moisture 2.Heat treatment 3.Making food cold 4.Irradiation 5.cook-chill 6.Sous-vide 7.Using chemicals
How can the bulk and weight of food be reduced to lower transport and handling costs?
By removing the water.
What happens in heat treatment? (biologically/chemically)
It destroys most of the enzymes and micro organisms which cause food deterioration.
How does heat treatment in foods work? (the process in which it works)
The food is cooked and sterilised and then put in air tight containers.
What is the common freezer temperature?
-18 to -29 degrees.
What is the normal fridge temperature?
0-5 degrees
What is spray drying used for?
liquids and products which may be damaged by excessive heating, such as milk or potato.
What is bed drying used for?
Foods such as coffee or potato. Granules rather than powder is formed.
What is accelerated freeze drying consist of and what is it used for?
Involves freezing food in a cabinet, pumping the air out and vapourising the ice so quickly that the ice turns to steam without turning into water.
