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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 ...
Promession is an idea of how to dispose human remains by way of freeze drying. The concept of promession was developed by Swedish biologist Susanne Wiigh-Mäsak, who derived the name from the Italian word for "promise" ( promessa ). [1] She founded Promessa Organic AB in 1997 to commercially pursue her idea. [2]
In its initial years, Edwards Vacuum imported vacuum equipment from Germany's Leybold. [2] [3] A freeze-drying method using vacuum chambers was patented in the 1930s. During World War II, the technology was further perfected and expanded to freeze-dry instant coffee, but also blood plasma and penicillin.
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 ...
Food preservation. A food scientist is preparing a meal for astronauts in space. Food preservation includes processes that make food more resistant to microorganism growth and slow the oxidation of fats. This slows down the decomposition and rancidification process. Food preservation may also include processes that inhibit visual deterioration ...
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.
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