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Freeze-dried strawberries. Freeze drying, also known as lyophilization or cryodesiccation, is a low temperature dehydration process [1] that involves freezing the product and lowering pressure, thereby removing the ice by sublimation. [2] This is in contrast to dehydration by most conventional methods that evaporate water using heat. [3]
The food is in individual pieces, and is frozen quickly. Products commonly frozen with IQF technologies are typically smaller pieces of food, and can include berries , fruits and vegetables both diced or sliced, seafood such as shrimp and small fish , meat , poultry , pasta , cheese and grains . [ 1 ]
A good solar food dryer may dry food much faster than some air dryers. Some solar driers can achieve higher food drying temperatures than some air driers. However, direct sun drying can chemically alter some foods, making them less appetizing. [5] Food drying primarily requires heat, and solar radiation can easily be converted to heat.
Food drying is a method of food preservation in which food is dried (dehydrated or desiccated). Drying inhibits the growth of bacteria , yeasts , and mold through the removal of water . Dehydration has been used widely for this purpose since ancient times; the earliest known practice is 12,000 B.C. by inhabitants of the modern Asian and Middle ...
When solid objects like strawberries are freeze dried the original shape of the product is maintained. [19] If the product to be dried is a liquid, as often seen in pharmaceutical applications, the properties of the final product are optimized by the combination of excipients (i.e., inactive ingredients). Primary applications of freeze drying ...
A soaring demand for food delivered fast has spawned small armies of couriers — and increasing alarm — in big cities where scooters, motorcycles and mopeds zip in and out of traffic and hop ...
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