The Procedure of Freeze-Drying
Freeze-drying is a complicated method of preserving new or currently-cooked food by removing up to 98% of the food’s humidity, leaving intact the food’s texture, taste, aroma and nutritional worth.
The procedure requires that the refreshing or cooked food be rapidly frozen at temperatures as reduced 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 food evaporate into h2o vapor, bypassing water’s liquid sort, by means of a approach known as sublimation.
This process preserves the cell composition and nutritional articles of the food, resulting in a item that, when rehydrated, quite carefully resembles the first meals.
The procedure also prevents the h2o from getting reabsorbed by the foods and thus decreases its weight substantially.
Most meals objects these kinds of as fruits, greens and meats are nicely-suited to freeze-drying, and can be utilized for extended-phrase foodstuff storage and preservation.
The Procedure of Dehydration
Dehydrating foods is a foods preservation technique which has been utilized for centuries. Indigenous People in america dehydrated their buffalo kills in their looking camps to make it less difficult to transportation. 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 procedure associated both air drying (with close by campfires), or sun drying strips of meat on drying racks.
Dehydrators are a modern day strategy for slowly getting rid of the dampness from foods without actually cooking it. A disadvantage of dehydration is the constrained sum of foodstuff which can be dried at one particular time. The optimistic aspect of dehydration is that this strategy of processing for meals storage can be simply accomplished at residence.
How Do These Two Techniques Affect the Foodstuff?
Daniel Zetterholm -dried food items protect a lot of the authentic colour, condition, aroma and freshness of fruits, veggies and meats. Freeze-dried foods does not generally include additives or preservatives, so it stays accurate to its unique form. And the search, texture and taste of the meals stays following re-hydration.
In contrast to lower-heat dehydration, freeze-drying enables for the preservation of pre-cooked foods, including recipes this sort of as soups, stews, stroganoff, and the like. An clear advantage is that since the food was ready in its entirety prior to freeze-drying, all you need to do is basically include water, then heat for a couple of minutes in purchase to generate luxurious foods.
Rehydrating freeze-dried foods takes just a couple of minutes, simply by incorporating boiling water. Some foodstuff, like many fruits and veggies, want no re-hydration prior to eating.
Dehydrated meals shrink during processing as the dampness is eliminated. So the foods item alone is noticeably scaled-down than its unique size.
The re-hydration time of dehydrated foodstuff will take a bit more time than freeze-dried, but it stills tastes like the unique kind of the foods. Some dehydrated foodstuff incorporate additional ingredients to enhance flavors or help in preservation. As with freeze-dried fruits and vegetables, dehydrated fruits and vegetables can be eaten without any re-hydration.
The two methods of food preservation enhance the long-expression storage lifestyle of foodstuff. Most commercially created freeze-dried and dehydrated foodstuff have a shelf existence of fifteen to 20 several years, if properly packaged and stored in a cool, dry surroundings.
In addition to their becoming a trustworthy source of foodstuff in an emergency or lengthy-time period survival state of affairs, since of their light-weight bodyweight and relieve of portability, these meals are also wonderful for getting on tenting, climbing and hunting journeys. They are also a clever choice to keep in an emergency street-facet package for the car, or in your bug out bag.
If you choose to hold these foods in your automobile as part of an crisis package, please remember to rotate them periodically. Temperatures in a automobile can get to extremes, each hot and cold. Higher heat as effectively as ongoing temperature fluctuations contribute to quicker degradation of both dehydrated and freeze-dried foodstuff.
Which Kind is Far better for Use?
Everyone is diverse, and every single man or woman has their very own private tastes and tastes. With that in mind, there are a number of things to take into account just before generating a decision between freeze-dried or dehydrated foods.
Residence-developed fruits and greens are much better preserved through dehydration, given that the average person can not afford the costly machinery utilized in freeze-drying.
Foodstuff utilised in everyday cooking and food preparation should almost certainly 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 either type of preserved foodstuff must meet those particular needs. As soon as once more, it truly is a issue of personal choices.
In a nutshell, both dehydrated and freeze-dried foods are excellent selections for long-time period meals storage, as nicely as for everyday use or for mountaineering, tenting, and so on. They both give light-weight-fat, portable, practical meals. The principal variation is that freeze-dried foodstuff tend to greater maintain the condition, texture and flavors of the first foods.
Most people will discover that a blend will perform best for their demands. Solitary-merchandise foods this kind of as veggies, potatoes, and other staples and grains are effectively-suited to reduced-heat dehydration. Freeze-drying is much more acceptable for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a variety of elements this sort of as soups, stews and sauces.