The Method of Freeze-Drying
Freeze-drying is a intricate approach of preserving fresh or currently-cooked foodstuff by removing up to ninety eight% of the food’s moisture, leaving intact the food’s texture, flavor, aroma and dietary price.
The procedure calls for that the refreshing or cooked meals be swiftly frozen at temperatures as low as -50°C. The frozen food is then placed into a vacuum chamber. This vacuum 特急殿堂 lowers the stress, and raises the temperature to just about 0°C.
At this particular temperature and stress, the ice crystals in the foodstuff evaporate into drinking water vapor, bypassing water’s liquid form, via a method referred to as sublimation.
This method preserves the cell construction and nutritional material of the foodstuff, resulting in a solution that, when rehydrated, really intently resembles the original food.
The method also prevents the water from currently being reabsorbed by the foods and thus decreases its fat drastically.
Most meals items this kind of as fruits, greens and meats are well-suited to freeze-drying, and can be utilized for lengthy-time period foods storage and preservation.
The Procedure of Dehydration
Dehydrating foods is a foods preservation technique which has been utilized for centuries. Native People in america dehydrated their buffalo kills in their looking camps to make it less difficult to transportation. Pemmican (a dehydrated concoction of buffalo meat blended with excess fat and berries) was a staple of several of the nomadic North American tribes. This low-heat dehydration procedure included both air drying (with nearby campfires), or sunshine drying strips of meat on drying racks.
Dehydrators are a modern day method for little by little getting rid of the dampness from foodstuff with no actually cooking it. A disadvantage of dehydration is the restricted volume of food which can be dried at one particular time. The constructive element of dehydration is that this method of processing for foods storage can be very easily done at property.
How Do These Two Techniques Influence the Foodstuff?
Freeze-dried foodstuff maintain much of the original shade, shape, aroma and freshness of fruits, vegetables and meats. Freeze-dried foods does not generally have additives or preservatives, so it remains accurate to its authentic sort. And the search, texture and flavor of the foodstuff stays right after re-hydration.
In contrast to low-heat dehydration, freeze-drying permits for the preservation of pre-cooked foods, which includes recipes this sort of as soups, stews, stroganoff, and the like. An apparent advantage is that because the meal was prepared in its entirety prior to freeze-drying, all you want to do is merely add water, then warmth for a few minutes in order to create sumptuous foods.
Rehydrating freeze-dried food requires just a number of minutes, basically by introducing boiling h2o. Some foods, like a lot of fruits and vegetables, require no re-hydration ahead of ingesting.
Dehydrated food items shrink for the duration of processing as the moisture is removed. So the food product alone is noticeably scaled-down than its original measurement.
The re-hydration time of dehydrated food items normally takes a little bit for a longer time than freeze-dried, but it stills preferences like the original sort of the foods. Some dehydrated foods contain added ingredients to enhance flavors or aid in preservation. As with freeze-dried fruits and greens, dehydrated fruits and veggies can be eaten with out any re-hydration.
Each strategies of food preservation increase the lengthy-expression storage life of foods. Most commercially produced freeze-dried and dehydrated foodstuff have a shelf lifestyle of fifteen to twenty many years, if effectively packaged and saved in a awesome, dry surroundings.
In addition to their being a reliable resource of foods in an emergency or extended-time period survival situation, simply because of their light weight and ease of portability, these meals are also fantastic for taking on camping, mountaineering and hunting trips. They are also a wise decision to hold in an emergency highway-aspect kit for the auto, or in your bug out bag.
If you decide on to preserve these meals in your auto as part of an unexpected emergency package, you should bear in mind to rotate them periodically. Temperatures in a automobile can attain extremes, each scorching and chilly. High warmth as well as constant temperature fluctuations contribute to quicker degradation of both dehydrated and freeze-dried food items.
Which Kind is Better for Intake?
Every person is diverse, and every particular person has their very own personalized preferences and tastes. With that in head, there are a few factors to consider before generating a choice amongst freeze-dried or dehydrated food.
Property-developed fruits and vegetables are much better preserved through dehydration, considering that the typical person cannot pay for the expensive machinery utilized in freeze-drying.
Foodstuff employed in each day cooking and food planning should possibly be freeze-dried. This permits the foodstuff to be swiftly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than either kind of preserved meals should fulfill these particular needs. As soon as again, it truly is a issue of personal choices.
In a nutshell, equally dehydrated and freeze-dried foods are excellent options for long-expression meals storage, as effectively as for every day use or for mountaineering, tenting, and many others. They each supply light-weight-bodyweight, moveable, hassle-free meals. The primary variation is that freeze-dried foods are likely to far better preserve the shape, texture and flavors of the original foodstuff.
Most men and women will discover that a combination will work ideal for their demands. Solitary-product meals this kind of as vegetables, potatoes, and other staples and grains are properly-suited to lower-warmth dehydration. Freeze-drying is more appropriate for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a range of components this kind of as soups, stews and sauces.