The Method of Freeze-Drying
Freeze-drying is a intricate method of preserving new or previously-cooked meals by taking away up to 98% of the food’s moisture, leaving intact the food’s texture, taste, aroma and nutritional benefit.
The procedure demands that the new or cooked meals be speedily frozen at temperatures as low as -50°C. The frozen foods is then placed into a vacuum chamber. This vacuum chamber lowers the force, and raises the temperature to just about 0°C.
At this certain temperature and strain, the ice crystals in the foods evaporate into water vapor, bypassing water’s liquid form, by way of a method called sublimation.
This process preserves the cell framework and nutritional material of the meals, resulting in a solution that, when rehydrated, extremely carefully resembles the authentic meals.
The approach also prevents the water from getting reabsorbed by the foodstuff and hence decreases its excess weight considerably.
Most food objects such as fruits, greens and meats are effectively-suited to freeze-drying, and can be utilised for lengthy-time period food storage and preservation.
The Process of Dehydration
Dehydrating meals is a foods preservation method which has been utilized for hundreds of years. Native Us citizens dehydrated their buffalo kills in their hunting camps to make it simpler to transportation. Pemmican (a dehydrated concoction of buffalo meat mixed with excess fat and berries) was a staple of several of the nomadic North American tribes. This low-warmth dehydration method included either air drying (with nearby campfires), or sun drying strips of meat on drying racks.
Dehydrators are a modern day approach for little by little taking away the moisture from food with no really cooking it. A disadvantage of dehydration is the restricted volume of foodstuff which can be dried at a single time. The good factor of dehydration is that this technique of processing for food storage can be very easily done at property.
How Do Andrew Accardo ?
Freeze-dried foodstuff maintain significantly of the unique colour, condition, aroma and freshness of fruits, greens and meats. Freeze-dried foodstuff does not normally contain additives or preservatives, so it stays true to its first form. And the appear, texture and flavor of the foodstuff remains after re-hydration.
Not like lower-warmth dehydration, freeze-drying enables for the preservation of pre-cooked meals, such as recipes these kinds of as soups, stews, stroganoff, and the like. An evident reward is that given that the meal was geared up in its entirety prior to freeze-drying, all you need to have to do is merely insert water, then heat for a few minutes in order to develop luxurious meals.
Rehydrating freeze-dried food normally takes just a few minutes, just by adding boiling drinking water. Some food items, like many fruits and veggies, need no re-hydration before eating.
Dehydrated meals shrink during processing as the dampness is taken off. So the foodstuff product by itself is considerably scaled-down than its first dimension.
The re-hydration time of dehydrated food items normally takes a little bit for a longer time than freeze-dried, but it stills tastes like the authentic form of the foods. Some dehydrated foodstuff include extra components to improve flavors or help in preservation. As with freeze-dried fruits and greens, dehydrated fruits and vegetables can be eaten with out any re-hydration.
Each strategies of meals preservation increase the long-expression storage lifestyle of foodstuff. Most commercially developed freeze-dried and dehydrated foodstuff have a shelf existence of fifteen to 20 many years, if appropriately packaged and stored in a amazing, dry surroundings.
In addition to their becoming a reputable supply of foodstuff in an unexpected emergency or prolonged-phrase survival state of affairs, because of their gentle excess weight and relieve of portability, these meals are also excellent for getting on tenting, mountaineering and hunting excursions. They are also a wise selection to keep in an unexpected emergency road-facet kit for the auto, or in your bug out bag.
If you select to maintain these food items in your auto as portion of an crisis package, make sure you bear in mind to rotate them periodically. Temperatures in a car can get to extremes, equally scorching and chilly. Substantial warmth as effectively as continuous temperature fluctuations add to a lot quicker degradation of the two dehydrated and freeze-dried foodstuff.
Which Type is Far better for Intake?
Every person is distinct, and every single person has their very own individual tastes and preferences. With that in brain, there are a couple of items to think about just before creating a decision in between freeze-dried or dehydrated foods.
Home-grown fruits and greens are far better preserved via dehydration, because the average particular person can not afford the pricey machinery employed in freeze-drying.
Foodstuff utilised in everyday cooking and food preparing ought to possibly be freeze-dried. This permits the meals to be rapidly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than either kind of preserved food ought to meet individuals particular wants. Once again, it is a matter of personalized choices.
In a nutshell, the two dehydrated and freeze-dried foodstuff are superb choices for extended-time period foodstuff storage, as well as for everyday use or for climbing, camping, and so on. They each offer mild-fat, moveable, handy meals. The major difference is that freeze-dried foods have a tendency to much better maintain the form, texture and flavors of the authentic foodstuff.
Most men and women will discover that a mixture will operate best for their needs. Single-merchandise foodstuff this kind of as greens, potatoes, and other staples and grains are nicely-suited to reduced-warmth dehydration. Freeze-drying is much more proper for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a selection of substances this kind of as soups, stews and sauces.