Everything about Frozen Food totally explained
Frozen food is food preserved by the process of
freezing. Freezing food is a common method of
food preservation which slows both food
decay and, by turning
water to
ice, makes it unavailable for
bacterial growth and slows down most
chemical reactions.
Process
Freezing only slows the deterioration of food and while it may stop the growth of micro-organisms, it doesn't necessarily kill them. Many
enzyme reactions are only slowed by freezing. Therefore it's common to stop enzyme activity before freezing, either by
blanching or 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 can't 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.
Quick-freezing
American inventor
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.
The
food industry uses 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 very quickly.
Traditional and other use
Many
Arctic communities would preserve food in holes or
larders dug into the ice. There is a tradition in
Scandinavia of 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.
Further Information
Get more info on 'Frozen Food'.
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