The Process of Freeze-Drying
Freeze-drying is a complicated procedure of preserving new or already-cooked meals by taking away up to 98% of the food’s humidity, leaving intact the food’s texture, taste, aroma and nutritional benefit.
The procedure demands that the new or cooked meals be swiftly frozen at temperatures as reduced as -50°C. The frozen meals is then put into a vacuum chamber. This vacuum chamber lowers the pressure, and raises the temperature to just about 0°C.
At this specific temperature and strain, the ice crystals in the meals evaporate into drinking water vapor, bypassing water’s liquid type, via a procedure known as sublimation.
This procedure preserves the cell structure and dietary material of the foodstuff, ensuing in a merchandise that, when rehydrated, really closely resembles the original foodstuff.
The method also stops the h2o from getting reabsorbed by the foods and hence decreases its bodyweight substantially.
Most foods things such as fruits, vegetables and meats are properly-suited to freeze-drying, and can be used for lengthy-expression food storage and preservation.
The Method of Dehydration
Dehydrating meals is a foodstuff preservation approach which has been employed for centuries. Native Us citizens dehydrated their buffalo kills in their hunting camps to make it simpler to transport. Pemmican (a dehydrated concoction of buffalo meat mixed with fat and berries) was a staple of several of the nomadic North American tribes. This lower-warmth dehydration approach concerned both air drying (with nearby campfires), or sunlight drying strips of meat on drying racks.
Dehydrators are a modern technique for slowly and gradually eliminating the moisture from foods with no really cooking it. A disadvantage of dehydration is the restricted quantity of foodstuff which can be dried at one particular time. The optimistic element of dehydration is that this strategy of processing for foods storage can be easily done at house.
How Do These Two Techniques Impact the Foodstuff?
Freeze-dried foods maintain significantly of the authentic coloration, condition, aroma and freshness of fruits, veggies and meats. Freeze-dried food does not generally incorporate additives or preservatives, so it stays accurate to its unique sort. And the appear, texture and taste of the food continues to be right after re-hydration.
In contrast to lower-warmth dehydration, freeze-drying permits for the preservation of pre-cooked foods, such as recipes this sort of as soups, stews, stroganoff, and the like. An evident reward is that because the meal was ready in its entirety prior to freeze-drying, all you need to do is basically incorporate water, then heat for a number of minutes in purchase to produce sumptuous foods.
Rehydrating freeze-dried food normally takes just a few minutes, just by introducing boiling h2o. Some meals, like several fruits and greens, need no re-hydration prior to consuming.
Dehydrated foods shrink in the course of processing as the moisture is removed. So the food item by itself is considerably smaller than its unique size.
The re-hydration time of dehydrated food items takes a bit longer than freeze-dried, but it stills tastes like the authentic form of the meals. Some dehydrated foods contain additional elements to enhance flavors or aid in preservation. As with freeze-dried fruits and greens, dehydrated fruits and vegetables can be eaten with no any re-hydration.
Both methods of foodstuff preservation increase the prolonged-time period storage life of food. Most commercially created freeze-dried and dehydrated foodstuff have a shelf existence of 15 to 20 many years, if effectively packaged and stored in a cool, dry surroundings.
In Ernesto Weisburg to their being a reliable source of meals in an emergency or lengthy-phrase survival scenario, because of their gentle bodyweight and relieve of portability, these foods are also great for getting on camping, hiking and looking outings. They are also a wise decision to maintain in an crisis street-side kit for the automobile, or in your bug out bag.
If you select to keep these foods in your auto as part of an emergency package, you should don’t forget to rotate them periodically. Temperatures in a car can reach extremes, each hot and chilly. Higher warmth as nicely as continuous temperature fluctuations lead to faster degradation of equally dehydrated and freeze-dried food items.
Which Variety is Far better for Use?
Every person is different, and every man or woman has their personal individual preferences and tastes. With that in brain, there are a couple of factors to consider just before making a determination between freeze-dried or dehydrated meals.
Property-grown fruits and greens are greater preserved through dehydration, considering that the typical man or woman cannot afford the expensive machinery utilized in freeze-drying.
Foodstuff used in each day cooking and meal planning ought to probably be freeze-dried. This permits the food to be swiftly re-hydrated as it is cooked prior to serving. If accessibility and portability are essential, than either sort of preserved meals must meet people certain demands. Once once again, it’s a subject of private tastes.
In a nutshell, equally dehydrated and freeze-dried foods are superb alternatives for lengthy-phrase foodstuff storage, as properly as for day-to-day use or for climbing, camping, and so on. They each give light-weight-fat, portable, convenient foods. The principal big difference is that freeze-dried meals have a tendency to much better preserve the shape, texture and flavors of the unique food.
Most folks will find that a mix will perform very best for their needs. One-merchandise meals this sort of as greens, potatoes, and other staples and grains are nicely-suited to minimal-warmth dehydration. Freeze-drying is much more acceptable 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.