The Procedure of Freeze-Drying
Freeze-drying is a complicated procedure of preserving refreshing or already-cooked foods by getting rid of up to ninety eight% of the food’s dampness, leaving intact the food’s texture, flavor, aroma and dietary benefit.
Food Made Good needs that the fresh or cooked food be swiftly frozen at temperatures as lower as -50°C. The frozen meals 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 force, the ice crystals in the foodstuff evaporate into water vapor, bypassing water’s liquid sort, by way of a procedure referred to as sublimation.
This procedure preserves the cell framework and dietary material of the food, ensuing in a item that, when rehydrated, quite closely resembles the first foodstuff.
The approach also stops the h2o from being reabsorbed by the food and therefore decreases its bodyweight substantially.
Most meals things such as fruits, veggies and meats are effectively-suited to freeze-drying, and can be utilized for lengthy-expression foods storage and preservation.
The Procedure of Dehydration
Dehydrating meals is a foodstuff preservation method which has been used for centuries. Native Americans dehydrated their buffalo kills in their searching camps to make it less difficult to transportation. Pemmican (a dehydrated concoction of buffalo meat mixed with fat and berries) was a staple of several of the nomadic North American tribes. This reduced-heat dehydration process involved possibly air drying (with close by campfires), or sun drying strips of meat on drying racks.
Dehydrators are a modern day strategy for slowly and gradually removing the dampness from meals without really cooking it. A disadvantage of dehydration is the limited volume of food which can be dried at one particular time. The good element of dehydration is that this strategy of processing for meals storage can be simply completed at property.
How Do These Two Strategies Impact the Foodstuff?
Freeze-dried food items maintain a lot of the original color, condition, aroma and freshness of fruits, veggies and meats. Freeze-dried foodstuff does not normally contain additives or preservatives, so it remains correct to its authentic sort. And the appear, texture and flavor of the foodstuff remains after re-hydration.
In contrast to minimal-warmth dehydration, freeze-drying makes it possible for for the preservation of pre-cooked meals, like recipes such as soups, stews, stroganoff, and the like. An obvious advantage is that given that the food was prepared in its entirety prior to freeze-drying, all you require to do is simply add water, then warmth for a few minutes in get to create sumptuous meals.
Rehydrating freeze-dried food requires just a couple of minutes, simply by adding boiling water. Some foodstuff, like a lot of fruits and vegetables, require no re-hydration just before ingesting.
Dehydrated meals shrink during processing as the humidity is removed. So the food item by itself is noticeably more compact than its authentic measurement.
The re-hydration time of dehydrated meals requires a little bit more time than freeze-dried, but it stills preferences like the authentic kind of the foodstuff. Some dehydrated foods include added components 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.
The two strategies of foods preservation increase the lengthy-expression storage existence of meals. Most commercially made freeze-dried and dehydrated foods have a shelf lifestyle of fifteen to twenty many years, if appropriately packaged and stored in a cool, dry surroundings.
In addition to their becoming a dependable resource of food in an crisis or extended-time period survival circumstance, due to the fact of their light fat and relieve of portability, these food items are also great for getting on camping, mountaineering and searching journeys. They are also a smart decision to hold in an emergency highway-aspect package for the vehicle, or in your bug out bag.
If you choose to maintain these foods in your vehicle as part of an unexpected emergency kit, remember to keep in mind to rotate them periodically. Temperatures in a vehicle can reach extremes, each very hot and cold. High warmth as well as constant temperature fluctuations add to more quickly degradation of each dehydrated and freeze-dried food items.
Which Sort is Better for Usage?
Everyone is various, and every man or woman has their personal individual preferences and choices. With that in brain, there are a couple of things to take into account prior to generating a selection amongst freeze-dried or dehydrated meals.
Residence-developed fruits and vegetables are better preserved by means of dehydration, because the average individual can not manage the expensive equipment employed in freeze-drying.
Foods utilized in daily cooking and meal preparing need to possibly be freeze-dried. This permits the foods to be rapidly re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than both variety of preserved meals should fulfill people certain needs. When yet again, it is a make a difference of private preferences.
In a nutshell, the two dehydrated and freeze-dried foodstuff are superb selections for prolonged-term foodstuff storage, as properly as for everyday use or for climbing, camping, etc. They the two give light-bodyweight, transportable, practical food items. The primary difference is that freeze-dried foodstuff have a tendency to much better maintain the shape, texture and flavors of the original food.
Most people will locate that a mixture will operate ideal for their needs. Single-item food items such as veggies, potatoes, and other staples and grains are nicely-suited to lower-heat dehydration. Freeze-drying is more appropriate for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a assortment of ingredients such as soups, stews and sauces.