2024 Author: Isabella Gilson | [email protected]. Last modified: 2023-12-17 03:14
Today, freeze-dried products are becoming more and more popular. First you need to understand what is sublimation? In physics, this means the transition of a substance from a solid to a gaseous state.
For this to happen with water, you need low pressure and low temperature. Sublimation technology has been known for a long time: for example, representatives of ancient tribes left fish in the sun, thanks to which it completely dried out and could be safely stored indoors, while remaining a nutritious and tasty product. In the middle of the last century, sublimated products were made by research institutes for the needs of astronauts. A little later, these products entered the diet of geologists and tourists. Today, sublimated does not mean expensive. So, in the USA, a movement is becoming more and more popular, the main motto of which is the statement that freeze-dried foods are he althier food.
Technology
Transforming a product from ordinary to sublimated is not as easy as it seems at first glance. Certain conditions must be met. Yes, food is frozen.temperatures as low as possible, the water becomes ice, but the crystals do not destroy the cell walls. After that, the products are placed in vacuum chambers, where, under the influence of low pressure, the ice evaporates, turning into steam. At the same time, only 3-4% moisture remains in the product. Then the finished product is packed in a sealed container, pumping nitrogen. Due to this, freeze-dried products are less exposed to the rotting process. This processing process can be done at home, but an alternative way to preserve food will require more effort.
Advantages of processing technology
- Freeze-dried - this means not subject to heat treatment, that is, it is a product that has almost completely retained all the nutritional properties of a fresh product. It even retains its unique taste and special appearance.
- No artificial flavor enhancers are used in the technology process. So, freeze-dried juices from beetroot are much tastier than freshly squeezed ones - they already have quite pronounced taste properties. Therefore, such products are used as the basis for baby food.
- Only truly fresh produce survives this complex process, so you can be sure you're buying quality food.
- Long shelf life.
- During hiking trips and long trips, the question of extra things in bags is especially acute. And it becomes impossible to make a balanced diet on the road, because then the package with foodwill be unbearable. Another thing is if each product in the luggage is replaced with a sublimated one. This will not only satisfy the taste preferences of travelers, but also relieve unnecessary burdens.
Sublimate coffee
By the way, for connoisseurs of an invigorating drink. This product processing technology is also widely used. Instant coffee has now improved a bit: freeze-dried coffee has appeared, the price of which is also slightly higher than the usual cost of a jar of instant powder. Dense crystals in the form of pyramids are made using the “hot freezing” technology. But this type of coffee belongs to the elite, because no artificial flavor enhancers are used for its production.
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