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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]
Dried fish most commonly cod or haddock, known as Harðfiskur, is a delicacy in Iceland, while dried reindeer meat is a traditional Sámi food. Dried meats include prosciutto , bresaola, biltong and beef jerky. Dried fruits have been consumed historically due to their high sugar content and sweet taste, and a longer shelf-life from drying. [4]
Sometimes meat is buried under conditions that cause preservation. If buried on hot coals or ashes, the heat can kill pathogens, the dry ash can desiccate, and the earth can block oxygen and further contamination. If buried where the earth is very cold, the earth acts like a refrigerator, or, in areas of permafrost, a freezer.
Cooking meat, eggs and fish at high temperatures can change their nutritional value. Healthy fats, such as omega-3 fatty acids found in fatty fish like salmon, mackerel and sardines, are highly ...
In addition to protein and nutrients, meat also has fat and cholesterol, and this varies by type. "Too much fat can cause weight gain, which can cause metabolic disorders, and has an impact on ...
Whether choosing to preserve food by canning, freezing or drying, remember there are guidelines to follow for the best results in safety and flavor.
This process increases the surface area of the powdered product by partially rehydrating spray-dried milk powder. Freeze-drying – The first application of freeze drying was most likely in the pharmaceutical industry; however, a successful large-scale industrial application of the process was the development of continuous freeze drying of coffee.
Fluidized bed freezing is a variant of air-blast freezing where pelletized food is blown by fast-moving cold air from below, forming a fluidized bed. The small size of the food combined with the fast-flowing air provides good heat transfer and therefore quicker freezing. Contact freezing uses physical contact other than air to transfer the heat.