The Method of Freeze-Drying
Freeze-drying is a intricate approach of preserving refreshing or already-cooked foodstuff by removing up to 98% of the food’s dampness, leaving intact the food’s texture, taste, aroma and dietary price.

The method calls for that the new or cooked food be speedily frozen at temperatures as lower as -50°C. The frozen foods is then put into a vacuum chamber. This vacuum chamber lowers the force, and raises the temperature to just about 0°C.

At this distinct temperature and force, the ice crystals in the foods evaporate into h2o vapor, 急凍食品網購 water’s liquid sort, through a approach named sublimation.

This procedure preserves the mobile structure and dietary content material of the foodstuff, ensuing in a product that, when rehydrated, quite closely resembles the first meals.
The approach also helps prevent the h2o from becoming reabsorbed by the food and hence decreases its fat substantially.

Most food things this sort of as fruits, greens and meats are effectively-suited to freeze-drying, and can be utilised for extended-expression meals storage and preservation.

The Approach of Dehydration
Dehydrating foodstuff is a meals preservation method which has been used for centuries. Indigenous Us citizens dehydrated their buffalo kills in their hunting camps to make it easier to transportation. Pemmican (a dehydrated concoction of buffalo meat combined with body fat and berries) was a staple of numerous of the nomadic North American tribes. This low-warmth dehydration process concerned either air drying (with close by campfires), or sun drying strips of meat on drying racks.

Dehydrators are a modern strategy for slowly getting rid of the humidity from foodstuff without truly cooking it. A drawback of dehydration is the limited quantity of foodstuff which can be dried at one time. The good factor of dehydration is that this approach of processing for foods storage can be very easily accomplished at residence.

How Do These Two Techniques Impact the Foodstuff?
Freeze-dried foodstuff protect considerably of the authentic color, form, aroma and freshness of fruits, greens and meats. Freeze-dried foodstuff does not typically incorporate additives or preservatives, so it stays real to its first sort. And the search, texture and taste of the food continues to be after re-hydration.

Not like low-warmth dehydration, freeze-drying permits for the preservation of pre-cooked foods, like recipes this kind of as soups, stews, stroganoff, and the like. An clear benefit is that given that the food was geared up in its entirety prior to freeze-drying, all you need to do is simply insert drinking water, then heat for a number of minutes in order to generate luxurious meals.

Rehydrating freeze-dried foodstuff will take just a number of minutes, basically by incorporating boiling water. Some foodstuff, like numerous fruits and vegetables, need to have no re-hydration before eating.

Dehydrated foods shrink for the duration of processing as the dampness is taken out. So the foodstuff item by itself is significantly scaled-down than its unique dimension.

The re-hydration time of dehydrated meals normally takes a little bit for a longer time than freeze-dried, but it stills tastes like the authentic kind of the foods. Some dehydrated foods include extra ingredients to boost flavors or support in preservation. As with freeze-dried fruits and vegetables, dehydrated fruits and vegetables can be eaten with out any re-hydration.

Both methods of foods preservation enhance the lengthy-expression storage life of meals. Most commercially produced freeze-dried and dehydrated food items have a shelf existence of 15 to 20 many years, if properly packaged and saved in a cool, dry atmosphere.

In addition to their currently being a reliable source of foods in an emergency or prolonged-time period survival state of affairs, simply because of their mild excess weight and simplicity of portability, these meals are also great for getting on camping, hiking and searching excursions. They are also a smart selection to maintain in an emergency road-facet kit for the automobile, or in your bug out bag.

If you select to preserve these food items in your vehicle as component of an crisis package, make sure you keep in mind to rotate them periodically. Temperatures in a car can achieve extremes, each very hot and chilly. High heat as effectively as continuous temperature fluctuations add to more quickly degradation of the two dehydrated and freeze-dried foods.

Which Type is Better for Use?
Every person is different, and every man or woman has their own private preferences and choices. With that in mind, there are a few factors to take into account ahead of making a determination in between freeze-dried or dehydrated meals.

Home-grown fruits and greens are better preserved through dehydration, since the average person cannot manage the pricey machinery utilised in freeze-drying.

Foodstuff utilised in every day cooking and food preparation ought to possibly be freeze-dried. This permits the foods to be speedily re-hydrated as it is cooked prior to serving. If accessibility and portability are essential, than both kind of preserved meals ought to meet up with individuals specific demands. As soon as again, it really is a matter of personal tastes.

In a nutshell, both dehydrated and freeze-dried food items are excellent alternatives for prolonged-phrase foods storage, as nicely as for day-to-day use or for climbing, tenting, etc. They each offer light-bodyweight, portable, hassle-free meals. The principal distinction is that freeze-dried foods are inclined to much better maintain the form, texture and flavors of the original foodstuff.

Most folks will uncover that a blend will function best for their demands. Single-merchandise foods such as greens, potatoes, and other staples and grains are properly-suited to lower-heat dehydration. Freeze-drying is a lot more suitable for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a range of ingredients these kinds of as soups, stews and sauces.