- Frozen food
Frozen food is food preserved by the process of
freezing. Freezing food is a common method of food preservationwhich slows both food decay and, by turning waterto ice, makes it unavailable for most bacterial growth and slows down most chemical reactions.
Freezing only slows the deterioration of food and while it may stop the growth of micro-organisms, it does not necessarily kill them. Many
enzymereactions are only slowed by freezing. Therefore it is common to stop enzyme activity before freezing, either by blanchingor by adding chemicals.
Foods may be preserved for several months by freezing. Long-term freezing requires a constant temperature of -18 degrees Celsius (0 degrees Fahrenheit) or less. Some
freezers cannot achieve such a low temperature. The time food can be kept in the freezer is reduced considerably if the temperature in a freezer fluctuates. Fluctuations could occur by a small gap in the freezer door or adding a large amount of unfrozen food.
Clarence Birdseye, who developed the quick-freezing process of food preservation in the early 20th century, is considered the father of the frozen-food industry.
food industryuses a technique called flash freezing, an application of supercooling, to quickly freeze food items. In this case, water contained inside the food is subjected to temperatures well below its melting/freezing point (273 K or 0°C). This causes the water inside the foods to freeze
Traditional and other use
Arcticcommunities would preserve food in holes or larders dug into the ice. There is a tradition in Scandinaviaof preserving fish and especially herrings in this way.
Cold stores provide large-volume, long-term storage for strategic food stocks held in case of national emergency in many countries.
Seeds are stored in freezers at −18 °C or below in seedbanks. The seeds are stored as a source for planting in case seed reserves elsewhere should be destroyed. The seeds stored may be those of food crops or rare species.
An increasingly popular form of home cooking involves preparing a month of meals to store in the home freezer.
Once-a-month cookinghelps cooks save money by purchasing grocery items in bulk and save time by cutting preparation time down considerably.
* [http://hgic.clemson.edu/factsheets/hgic3523.htm Recommended times for refrigerator and freezer food storage]
* [http://frozenassets.wordpress.com/websites-for-freezing-food Freezing Food Links]
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