The Method of Freeze-Drying
Freeze-drying is a complicated procedure of preserving refreshing or already-cooked food by eliminating up to ninety eight% of the food’s dampness, leaving intact the food’s texture, flavor, aroma and nutritional benefit.
The approach demands that the fresh or cooked foodstuff be rapidly frozen at temperatures as reduced as -50°C. The frozen foodstuff is then placed into a vacuum chamber. This vacuum chamber lowers the force, and raises the temperature to just about 0°C.
At this distinct temperature and strain, the ice crystals in the meals evaporate into h2o vapor, bypassing water’s liquid form, through a procedure referred to as sublimation.
This method preserves the cell composition and dietary material of the food, ensuing in a item that, when rehydrated, quite carefully resembles the original foods.
The method also prevents the drinking water from becoming reabsorbed by the foods and thus decreases its excess weight considerably.
Most meals products such as fruits, veggies and meats are properly-suited to freeze-drying, and can be used for prolonged-term food storage and preservation.
The Approach of Dehydration
Dehydrating foods is a foods preservation strategy which has been employed for hundreds of years. Food Made Good in america dehydrated their buffalo kills in their looking camps to make it less complicated to transport. Pemmican (a dehydrated concoction of buffalo meat mixed with body fat and berries) was a staple of several of the nomadic North American tribes. This minimal-warmth dehydration approach concerned both air drying (with close by campfires), or sunshine drying strips of meat on drying racks.
Dehydrators are a modern strategy for slowly getting rid of the humidity from foodstuff with out actually cooking it. A disadvantage of dehydration is the restricted quantity of meals which can be dried at one particular time. The good element of dehydration is that this method of processing for food storage can be very easily completed at home.
How Do These Two Strategies Affect the Food?
Freeze-dried food items maintain much of the unique colour, form, aroma and freshness of fruits, veggies and meats. Freeze-dried meals does not usually incorporate additives or preservatives, so it stays correct to its authentic form. And the appear, texture and taste of the meals continues to be right after re-hydration.
In contrast to lower-warmth dehydration, freeze-drying enables for the preservation of pre-cooked meals, like recipes these kinds of as soups, stews, stroganoff, and the like. An evident benefit is that since the food was prepared in its entirety prior to freeze-drying, all you want to do is just incorporate drinking water, then heat for a few minutes in order to create sumptuous meals.
Rehydrating freeze-dried foods takes just a few minutes, just by adding boiling h2o. Some meals, like numerous fruits and vegetables, need to have no re-hydration prior to eating.
Dehydrated meals shrink during processing as the humidity is eliminated. So the foods merchandise itself is noticeably more compact than its unique measurement.
The re-hydration time of dehydrated meals requires a bit more time than freeze-dried, but it stills tastes like the authentic kind of the meals. Some dehydrated food items have included ingredients to increase flavors or aid in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and vegetables can be eaten without any re-hydration.
The two strategies of food preservation improve the extended-term storage daily life of foods. Most commercially created freeze-dried and dehydrated food items have a shelf existence of fifteen to 20 a long time, if appropriately packaged and stored in a awesome, dry setting.
In addition to their being a trustworthy supply of foodstuff in an crisis or long-expression survival state of affairs, because of their light-weight weight and simplicity of portability, these food items are also great for taking on camping, climbing and looking excursions. They are also a sensible choice to hold in an crisis road-aspect kit for the automobile, or in your bug out bag.
If you decide on to preserve these foodstuff in your car as part of an crisis package, you should don’t forget to rotate them periodically. Temperatures in a automobile can get to extremes, equally hot and cold. High heat as effectively as ongoing temperature fluctuations add to quicker degradation of equally dehydrated and freeze-dried food items.
Which Variety is Far better for Use?
Everyone is diverse, and every single man or woman has their possess individual tastes and choices. With that in head, there are a handful of factors to think about before generating a determination among freeze-dried or dehydrated food.
Property-developed fruits and vegetables are better preserved through dehydration, because the common man or woman can’t afford the costly machinery used in freeze-drying.
Foodstuff employed in everyday cooking and food planning should probably be freeze-dried. This permits the food to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than either kind of preserved meals must fulfill these certain requirements. As soon as again, it truly is a matter of personal choices.
In a nutshell, each dehydrated and freeze-dried meals are exceptional options for long-phrase food storage, as effectively as for day-to-day use or for climbing, camping, and so forth. They equally provide light-weight-fat, portable, hassle-free food items. The major difference is that freeze-dried foods are likely to greater preserve the form, texture and flavors of the original meals.
Most folks will find that a mix will work very best for their requirements. One-merchandise foodstuff these kinds of as greens, potatoes, and other staples and grains are nicely-suited to reduced-warmth 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 substances these kinds of as soups, stews and sauces.