The Process of Freeze-Drying
Freeze-drying is a complex procedure of preserving clean or previously-cooked meals by taking away up to 98% of the food’s humidity, leaving intact the food’s texture, flavor, aroma and dietary worth.
The method needs that the clean or cooked food be swiftly frozen at temperatures as lower as -50°C. The frozen food is then positioned into a vacuum chamber. This vacuum chamber lowers the force, and raises the temperature to just about 0°C.
At this specific temperature and stress, the ice crystals in the meals evaporate into h2o vapor, bypassing water’s liquid form, by means of a procedure named sublimation.
This process preserves the cell framework and nutritional content of the meals, ensuing in a solution that, when rehydrated, very closely resembles the authentic foodstuff.
The procedure also stops the drinking water from currently being reabsorbed by the food and therefore decreases its excess weight significantly.
Most food objects this sort of as fruits, greens and meats are nicely-suited to freeze-drying, and can be utilized for prolonged-term meals storage and preservation.
The Process of Dehydration
Dehydrating food is a foods preservation strategy which has been utilized for hundreds of years. Native People in america dehydrated their buffalo kills in their hunting camps to make it easier to transport. Pemmican (a dehydrated concoction of buffalo meat mixed with unwanted fat and berries) was a staple of a lot of of the nomadic North American tribes. This lower-heat dehydration method concerned possibly air drying (with nearby campfires), or sunshine drying strips of meat on drying racks.
Dehydrators are a present day approach for slowly and gradually removing the humidity from foodstuff without having really cooking it. A downside of dehydration is the minimal amount of foods which can be dried at a single time. The constructive factor of dehydration is that this approach of processing for food storage can be easily completed at house.
How Do These Two Approaches Have an effect on the Meals?
Freeze-dried foodstuff preserve a lot of the original coloration, condition, aroma and freshness of fruits, vegetables and meats. Freeze-dried food does not typically have additives or preservatives, so it stays real to its unique kind. And the search, texture and taste of the meals continues to be soon after re-hydration.
In contrast to low-warmth dehydration, freeze-drying enables for the preservation of pre-cooked meals, including recipes these kinds of as soups, stews, stroganoff, and the like. An apparent reward is that because the meal was well prepared in its entirety prior to freeze-drying, all you want to do is just include h2o, then heat for a few minutes in buy to generate luxurious meals.
Rehydrating freeze-dried meals normally takes just a number of minutes, just by adding boiling h2o. Some meals, like several fruits and vegetables, need no re-hydration prior to taking in.
Dehydrated foodstuff shrink for the duration of processing as the humidity is taken out. So the food merchandise alone is significantly smaller than its original size.
The re-hydration time of dehydrated foodstuff will take a little bit lengthier than freeze-dried, but it stills preferences like the unique sort of the foodstuff. Some dehydrated meals contain extra elements to boost flavors or help in preservation. As with franchise nasi bento -dried fruits and greens, dehydrated fruits and greens can be eaten with out any re-hydration.
Each approaches of meals preservation boost the prolonged-expression storage life of meals. Most commercially developed freeze-dried and dehydrated foodstuff have a shelf lifestyle of fifteen to 20 several years, if correctly packaged and saved in a awesome, dry atmosphere.
In addition to their currently being a reliable resource of foods in an unexpected emergency or extended-phrase survival situation, simply because of their gentle weight and simplicity of portability, these meals are also great for getting on tenting, mountaineering and looking excursions. They are also a clever choice to hold in an crisis road-aspect kit for the automobile, or in your bug out bag.
If you pick to maintain these foodstuff in your auto as portion of an emergency package, make sure you don’t forget to rotate them periodically. Temperatures in a auto can attain extremes, the two scorching and cold. Higher warmth as effectively as continuous temperature fluctuations lead to more quickly degradation of each dehydrated and freeze-dried food items.
Which Variety is Much better for Use?
Every person is various, and each person has their personal personal tastes and tastes. With that in thoughts, there are a few issues to consider prior to making a selection among freeze-dried or dehydrated foods.
Residence-grown fruits and greens are far better preserved by way of dehydration, because the typical particular person cannot pay for the pricey equipment utilized in freeze-drying.
Meals employed in everyday cooking and meal preparation need to possibly be freeze-dried. This permits the foods to be rapidly re-hydrated as it is cooked prior to serving. If accessibility and portability are essential, than either variety of preserved foodstuff must fulfill people specific requirements. Once again, it truly is a make a difference of private choices.
In a nutshell, both dehydrated and freeze-dried foods are excellent options for prolonged-term foodstuff storage, as effectively as for daily use or for climbing, tenting, and so on. They the two provide gentle-fat, moveable, practical meals. The major variation is that freeze-dried foods have a tendency to better preserve the condition, texture and flavors of the authentic foodstuff.
Most people will locate that a mixture will work ideal for their requirements. One-merchandise foodstuff this sort of as veggies, potatoes, and other staples and grains are nicely-suited to minimal-heat dehydration. Freeze-drying is far more appropriate for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a range of components these kinds of as soups, stews and sauces.