The Approach of Freeze-Drying
Freeze-drying is a complex approach of preserving refreshing or already-cooked foodstuff by taking away up to 98% of the food’s dampness, leaving intact the food’s texture, flavor, aroma and dietary benefit.
The procedure requires that the clean or cooked foods be speedily frozen at temperatures as reduced 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 particular temperature and strain, the ice crystals in the foods evaporate into water vapor, bypassing water’s liquid sort, by means of a approach called sublimation.
This method preserves the mobile framework and nutritional articles of the meals, ensuing in a solution that, when rehydrated, extremely carefully resembles the first foods.
The procedure also helps prevent the water from getting reabsorbed by the food and as a result decreases its weight substantially.
Most foods things this kind of as fruits, vegetables and meats are well-suited to freeze-drying, and can be utilized for long-time period food storage and preservation.
The Process of Dehydration
Dehydrating foods is a foodstuff preservation approach which has been employed for hundreds of years. Indigenous Americans dehydrated their buffalo kills in their searching camps to make it less difficult to transportation. Pemmican (a dehydrated concoction of buffalo meat combined with fat and berries) was a staple of a lot of of the nomadic North American tribes. This minimal-warmth dehydration procedure involved possibly air drying (with close by campfires), or sun drying strips of meat on drying racks.
Dehydrators are a modern strategy for slowly taking away the humidity from foodstuff with out actually cooking it. A drawback of dehydration is the constrained quantity of foodstuff which can be dried at one particular time. The positive element of dehydration is that this method of processing for foodstuff storage can be very easily carried out at home.
How Do These Two Approaches Impact the Foods?
Freeze-dried foodstuff preserve a lot of the authentic shade, form, aroma and freshness of fruits, vegetables and meats. Freeze-dried meals does not typically incorporate additives or preservatives, so it remains real to its authentic form. And the search, texture and flavor of the meals remains following re-hydration.
Unlike minimal-warmth dehydration, freeze-drying allows for the preservation of pre-cooked meals, which includes recipes these kinds of as soups, stews, stroganoff, and the like. An clear gain is that given that the food was prepared in its entirety prior to freeze-drying, all you want to do is just insert water, then warmth for a number of minutes in purchase to produce luxurious meals.
Rehydrating freeze-dried foods requires just a couple of minutes, merely by including boiling water. Some foods, like many fruits and vegetables, need no re-hydration before consuming.
Dehydrated foodstuff shrink during processing as the humidity is taken off. So the foodstuff product alone is considerably more compact than its first dimension.
The re-hydration time of dehydrated meals requires a little bit lengthier than freeze-dried, but it stills preferences like the first sort of the foods. Some dehydrated meals have additional elements to increase flavors or help in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten with no any re-hydration.
Equally techniques of foods preservation increase the extended-expression storage daily life of foodstuff. Most commercially made freeze-dried and dehydrated meals have a shelf existence of fifteen to twenty years, if appropriately packaged and saved in a amazing, dry setting.
In addition to their currently being a reliable supply of foods in an crisis or long-time period survival situation, since of their mild weight and relieve of portability, these foodstuff are also wonderful for having on camping, hiking and hunting trips. They are also a smart decision to maintain in an crisis street-facet package for the automobile, or in your bug out bag.
If you choose to keep these food items in your vehicle as element of an unexpected emergency kit, please don’t forget to rotate them periodically. Temperatures in a auto can get to extremes, equally hot and cold. Higher heat as nicely as ongoing temperature fluctuations contribute to quicker degradation of each dehydrated and freeze-dried meals.
Which Kind is Better for Consumption?
Absolutely everyone is various, and every individual has their personal personalized preferences and choices. With that in thoughts, there are a handful of issues to think about before generating a choice in between freeze-dried or dehydrated foods.
House-developed fruits and vegetables are much better preserved through dehydration, given that the regular man or woman can not afford the pricey machinery used in freeze-drying.
Sandwiches utilised in everyday cooking and food planning should almost certainly be freeze-dried. This permits the food to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than both type of preserved meals ought to satisfy individuals specific requirements. Once again, it is a issue of personalized tastes.
In a nutshell, each dehydrated and freeze-dried meals are excellent choices for prolonged-time period foods storage, as nicely as for day-to-day use or for climbing, camping, and so forth. They each supply mild-weight, transportable, handy foods. The main difference is that freeze-dried foodstuff are inclined to far better protect the condition, texture and flavors of the unique foodstuff.
Most folks will locate that a blend will function very best for their wants. Solitary-item meals such as greens, potatoes, and other staples and grains are effectively-suited to reduced-heat dehydration. Freeze-drying is a lot more suitable for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a selection of components these kinds of as soups, stews and sauces.