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Freeze drying. 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 ...
Freeze drying, also known as lyophilization or cryodesiccation, is a low temperature dehydration process [14] that involves freezing the product and lowering pressure, thereby removing the ice by sublimation. [15] This is in contrast to dehydration by most conventional methods that evaporate water using heat. [16]
Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent. It is increasingly applied to dry foods, beyond its already classical pharmaceutical or medical applications.
The freeze drying process is similar to dehydrating, but it is much more involved and requires special equipment. A home freeze dryer looks like a small front load washing machine. It contains ...
Supercritical drying (red arrow) goes beyond the critical point of the working fluid in order to avoid the direct liquid–gas transition seen in ordinary drying (green arrow) or the two phase changes in freeze-drying (blue arrow). Supercritical drying, also known as critical point drying, is a process to remove liquid in a precise and ...
The spray drying technique was first described in 1860 with the first spray dryer instrument patented by Samuel Percy in 1872. [citation needed] With time, the spray drying method grew in popularity, at first mainly for milk production in the 1920s and during World War II, when there was a need to reduce the weight and volume of food and other materials.
Cold traps also refer to the application of cooled surfaces or baffles to prevent oil vapours from flowing from a pump and into a chamber. In such a case, a baffle or a section of pipe containing a number of cooled vanes, will be attached to the inlet of an existing pumping system. By cooling the baffle, either with a cryogen such as a dry ice ...
The freeze-drying process, he says, concentrates the flavor, and when the water rehydrating the bite-size scoops comes from your own mouth, well… “Something magical happens,” Freelon said.