The Procedure of Freeze-Drying
Freeze-drying is a complicated process of preserving refreshing or already-cooked foods by eliminating up to 98% of the food’s moisture, leaving intact the food’s texture, flavor, aroma and nutritional benefit.
The process demands that the fresh or cooked foodstuff be rapidly frozen at temperatures as minimal as -50°C. The frozen meals is then put into a vacuum chamber. This vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this specific temperature and stress, the ice crystals in the foods evaporate into drinking water vapor, bypassing water’s liquid sort, by means of a approach called sublimation.
This process preserves the mobile composition and dietary content material of the meals, resulting in a merchandise that, when rehydrated, extremely closely resembles the authentic foodstuff.
The method also helps prevent the drinking water from being reabsorbed by the food and therefore decreases its bodyweight substantially.
Most foodstuff things this sort of as fruits, vegetables and meats are properly-suited to freeze-drying, and can be employed for prolonged-expression food storage and preservation.
The Method of Dehydration
Dehydrating meals is a foods preservation approach which has been used for generations. Fooditude dehydrated their buffalo kills in their looking camps to make it less difficult to transport. Pemmican (a dehydrated concoction of buffalo meat blended with body fat and berries) was a staple of many of the nomadic North American tribes. This lower-warmth dehydration method concerned either air drying (with nearby campfires), or sun drying strips of meat on drying racks.
Dehydrators are a modern technique for little by little removing the dampness from meals with no truly cooking it. A drawback of dehydration is the restricted amount of foodstuff which can be dried at a single time. The constructive facet of dehydration is that this approach of processing for food storage can be easily done at home.
How Do These Two Strategies Affect the Meals?
Freeze-dried meals maintain significantly of the authentic coloration, shape, aroma and freshness of fruits, vegetables and meats. Freeze-dried foodstuff does not generally incorporate additives or preservatives, so it remains correct to its authentic type. And the look, texture and flavor of the food remains after re-hydration.
Not like lower-warmth dehydration, freeze-drying allows for the preservation of pre-cooked meals, like recipes these kinds of as soups, stews, stroganoff, and the like. An evident reward is that considering that the meal was ready in its entirety prior to freeze-drying, all you need to do is basically add h2o, then heat for a few minutes in buy to create luxurious foods.
Rehydrating freeze-dried food normally takes just a number of minutes, just by introducing boiling water. Some meals, like a lot of fruits and greens, need no re-hydration ahead of consuming.
Dehydrated foods shrink in the course of processing as the moisture is eliminated. So the food item itself is substantially smaller than its original measurement.
The re-hydration time of dehydrated foods takes a little bit more time than freeze-dried, but it stills preferences like the unique form of the food. Some dehydrated meals include additional components to enhance flavors or support in preservation. As with freeze-dried fruits and vegetables, dehydrated fruits and greens can be eaten without having any re-hydration.
Both approaches of meals preservation improve the long-term storage existence of foods. Most commercially developed freeze-dried and dehydrated foodstuff have a shelf life of fifteen to twenty several years, if appropriately packaged and stored in a awesome, dry surroundings.
In addition to their becoming a reputable source of meals in an crisis or long-expression survival circumstance, because of their light fat and simplicity of portability, these food items are also wonderful for getting on camping, hiking and looking excursions. They are also a wise selection to keep in an crisis highway-side kit for the automobile, or in your bug out bag.
If you choose to maintain these meals in your car as part of an crisis kit, please don’t forget to rotate them periodically. Temperatures in a automobile can get to extremes, equally scorching and cold. High warmth as properly as constant temperature fluctuations lead to quicker degradation of equally dehydrated and freeze-dried meals.
Which Kind is Better for Usage?
Everybody is different, and each and every man or woman has their own personalized tastes and choices. With that in thoughts, there are a couple of things to take into account ahead of making a selection among freeze-dried or dehydrated food.
Property-developed fruits and vegetables are much better preserved via dehydration, since the regular individual cannot pay for the costly equipment utilized in freeze-drying.
Food items utilized in every day cooking and meal preparing need to almost certainly be freeze-dried. This permits the meals to be speedily re-hydrated as it is cooked prior to serving. If accessibility and portability are important, than possibly kind of preserved foods ought to meet these certain demands. When yet again, it’s a matter of individual preferences.
In a nutshell, equally dehydrated and freeze-dried foodstuff are outstanding options for lengthy-term food storage, as properly as for everyday use or for climbing, tenting, and so on. They each supply light-fat, moveable, convenient foods. The principal distinction is that freeze-dried foods have a tendency to much better protect the form, texture and flavors of the original foodstuff.
Most people will locate that a blend will perform greatest for their demands. One-merchandise foods such as greens, potatoes, and other staples and grains are nicely-suited to minimal-heat dehydration. Freeze-drying is far more suitable for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a assortment of ingredients such as soups, stews and sauces.