The Process of Freeze-Drying
Freeze-drying is a complicated approach of preserving fresh or already-cooked foods by getting rid of up to 98% of the food’s moisture, leaving intact the food’s texture, flavor, aroma and dietary value.
The approach calls for that the fresh or cooked foods be quickly frozen at temperatures as minimal as -50°C. The frozen foods is then positioned into a vacuum chamber. This vacuum chamber lowers the pressure, and raises the temperature to just about 0°C.
At this certain temperature and pressure, the ice crystals in the foodstuff evaporate into drinking water vapor, bypassing water’s liquid type, via a process known as sublimation.
This process preserves the mobile framework and nutritional content material of the meals, ensuing in a item that, when rehydrated, really carefully resembles the first foodstuff.
The procedure also helps prevent the h2o from getting reabsorbed by the foodstuff and hence decreases its bodyweight substantially.
Most foods things this kind of as fruits, veggies and meats are well-suited to freeze-drying, and can be used for prolonged-time period meals storage and preservation.
The Method of Dehydration
Dehydrating foodstuff is a food preservation method which has been employed for generations. Indigenous People in america dehydrated their buffalo kills in their searching camps to make it easier to transport. Pemmican (a dehydrated concoction of buffalo meat combined with excess fat and berries) was a staple of many of the nomadic North American tribes. This reduced-heat dehydration process associated either air drying (with close by campfires), or sunshine drying strips of meat on drying racks.
Dehydrators are a present day approach for slowly eliminating the humidity from foods without having in fact cooking it. A drawback of dehydration is the constrained sum of meals which can be dried at one time. The constructive factor of dehydration is that this approach of processing for foodstuff storage can be very easily done at house.
How Do These Two Strategies Impact the Food?
Freeze-dried food items maintain a lot of the original colour, form, aroma and freshness of fruits, veggies and meats. Freeze-dried meals does not normally contain additives or preservatives, so it continues to be accurate to its authentic type. And the look, texture and flavor of the food remains soon after re-hydration.
Unlike reduced-heat dehydration, freeze-drying permits for the preservation of pre-cooked foods, including recipes these kinds of as soups, stews, stroganoff, and the like. An apparent advantage is that given that the meal was prepared in its entirety prior to freeze-drying, all you require to do is basically incorporate h2o, then heat for a handful of minutes in order to create luxurious foods.
Rehydrating freeze-dried foodstuff normally takes just a number of minutes, basically by incorporating boiling h2o. Some foods, like numerous fruits and vegetables, want no re-hydration before eating.
Dehydrated foodstuff shrink during processing as the dampness is taken out. So the meals product itself is considerably more compact than its authentic dimensions.
The re-hydration time of dehydrated foods requires a little bit longer than freeze-dried, but it stills preferences like the authentic sort of the food. Some dehydrated meals incorporate included substances to boost flavors or assist in preservation. As with freeze-dried fruits and vegetables, dehydrated fruits and vegetables can be eaten with out any re-hydration.
Each methods of meals preservation enhance the lengthy-term storage life of meals. Most commercially developed freeze-dried and dehydrated food items have a shelf life of fifteen to 20 a long time, if effectively packaged and saved in a cool, dry atmosphere.
In addition to their currently being a reliable resource of foods in an crisis or lengthy-term survival situation, because of their light bodyweight and simplicity of portability, these food items are also excellent for using on camping, climbing and hunting excursions. They are also a sensible selection to maintain in an crisis road-aspect kit for the car, or in your bug out bag.
If you decide on to preserve these food items in your car as part of an crisis package, make sure you don’t forget to rotate them periodically. Temperatures in a vehicle can achieve extremes, each very hot and chilly. High warmth as well as continuous temperature fluctuations add to more quickly degradation of each dehydrated and freeze-dried meals.
Which Variety is Much better for Consumption?
Everybody is diverse, and every single man or woman has their very own personal preferences and tastes. With that in head, there are a couple of things to contemplate ahead of producing a selection amongst freeze-dried or dehydrated food.
Property-grown fruits and vegetables are much better preserved by means of dehydration, considering that the typical particular person are not able to afford the costly machinery employed in freeze-drying.
Meals employed in everyday cooking and food planning should probably be freeze-dried. This permits the meals to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than both kind of preserved food must meet up with individuals distinct needs. When yet again, it really is a make a difference of individual choices.
In a nutshell, both dehydrated and freeze-dried foods are outstanding alternatives for prolonged-phrase food storage, as nicely as for daily use or for climbing, camping, and many others. more information offer mild-weight, moveable, practical foods. The principal variation is that freeze-dried food items have a tendency to better protect the form, texture and flavors of the authentic foodstuff.
Most folks will uncover that a mix will function greatest for their demands. Single-item foods this sort of as veggies, potatoes, and other staples and grains are properly-suited to low-heat dehydration. Freeze-drying is more proper for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a assortment of ingredients this sort of as soups, stews and sauces.