The Procedure of Freeze-Drying
Freeze-drying is a complicated approach of preserving fresh or currently-cooked foods by removing up to 98% of the food’s dampness, leaving intact the food’s texture, flavor, aroma and nutritional value.
The procedure demands that the new or cooked foods be swiftly frozen at temperatures as low as -50°C. The frozen foodstuff is then put into a vacuum chamber. This vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this distinct temperature and pressure, the ice crystals in the food evaporate into water vapor, bypassing water’s liquid kind, via a approach named sublimation.
This procedure preserves the cell composition and nutritional content material of the meals, resulting in a item that, when rehydrated, very intently resembles the first food.
The approach also stops the water from currently being reabsorbed by the meals and therefore decreases its bodyweight significantly.
Most foods objects this kind of as fruits, veggies and meats are effectively-suited to freeze-drying, and can be employed for extended-expression meals storage and preservation.
The Method of Dehydration
Dehydrating meals is a foodstuff preservation strategy which has been utilized for centuries. Indigenous Individuals dehydrated their buffalo kills in their hunting camps to make it less complicated to transportation. Pemmican (a dehydrated concoction of buffalo meat blended with body fat and berries) was a staple of several of the nomadic North American tribes. This minimal-warmth dehydration procedure concerned possibly air drying (with nearby campfires), or sunlight drying strips of meat on drying racks.
Dehydrators are a modern method for gradually taking away the humidity from foodstuff with no in fact cooking it. A drawback of dehydration is the constrained quantity of food which can be dried at 1 time. The positive aspect of dehydration is that this strategy of processing for food storage can be very easily completed at house.
How Do These Two Approaches Impact the Foods?
Freeze-dried foodstuff maintain considerably of the authentic coloration, condition, aroma and freshness of fruits, vegetables and meats. Freeze-dried food does not usually contain additives or preservatives, so it continues to be real to its original form. And the look, texture and taste of the foods continues to be after re-hydration.
Unlike minimal-heat dehydration, freeze-drying enables for the preservation of pre-cooked foods, such as recipes this sort of as soups, stews, stroganoff, and the like. An clear benefit is that because the meal was well prepared in its entirety prior to freeze-drying, all you require to do is merely add drinking water, then heat for a handful of minutes in purchase to generate luxurious meals.
Rehydrating freeze-dried foods will take just a number of minutes, merely by including boiling drinking water. Some food items, like many fruits and greens, require no re-hydration before ingesting.
Dehydrated meals shrink in the course of processing as the humidity is removed. So the foodstuff item by itself is considerably smaller sized than its unique measurement.
The re-hydration time of dehydrated food items normally takes a bit for a longer time than freeze-dried, but it stills preferences like the first type of the food. Some dehydrated foods include additional elements to boost flavors or assist in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten with no any re-hydration.
Each methods of meals preservation improve the extended-time period storage lifestyle of meals. Most commercially produced freeze-dried and dehydrated food items have a shelf existence of fifteen to twenty many years, if effectively packaged and stored in a great, dry atmosphere.
In addition to their getting a reliable source of meals in an emergency or long-expression survival circumstance, since of their light-weight fat and ease of portability, these foodstuff are also fantastic for taking on tenting, hiking and looking trips. They are also a smart decision to maintain in an unexpected emergency highway-side kit for the auto, or in your bug out bag.
If you decide on to hold these food items in your automobile as element of an crisis package, make sure you remember to rotate them periodically. Temperatures in a car can reach extremes, each hot and cold. Substantial heat as nicely as steady temperature fluctuations lead to more quickly degradation of equally dehydrated and freeze-dried food items.
Which Type is Greater for Intake?
Every person is distinct, and each and every particular person has their personal private preferences and tastes. With that in thoughts, there are a few issues to take into account before creating a choice among freeze-dried or dehydrated foods.
Property-grown fruits and veggies are better preserved by way of dehydration, because the common man or woman can not pay for the pricey machinery employed in freeze-drying.
Foods utilised in each day cooking and food preparing ought to probably be freeze-dried. This permits the meals to be swiftly re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than both variety of preserved food must meet those distinct wants. After once again, Fooditude is a subject of private tastes.
In a nutshell, equally dehydrated and freeze-dried meals are exceptional selections for long-term food storage, as effectively as for everyday use or for mountaineering, tenting, and so on. They each give light-weight-excess weight, portable, hassle-free meals. The primary variation is that freeze-dried meals tend to far better preserve the form, texture and flavors of the authentic foods.
Most folks will locate that a combination will perform very best for their requirements. Single-product meals these kinds of as vegetables, potatoes, and other staples and grains are nicely-suited to minimal-heat dehydration. Freeze-drying is far more acceptable for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a selection of ingredients these kinds of as soups, stews and sauces.