Happy Hour of Freeze-Drying
Freeze-drying is a intricate approach of preserving new or previously-cooked foods by removing up to 98% of the food’s dampness, leaving intact the food’s texture, flavor, aroma and nutritional value.
The process demands that the refreshing or cooked foods be quickly frozen at temperatures as low as -50°C. The frozen foodstuff is then positioned into a vacuum chamber. This vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this distinct temperature and pressure, the ice crystals in the foods evaporate into h2o vapor, bypassing water’s liquid kind, via a method known as sublimation.
This process preserves the cell construction and nutritional content material of the foodstuff, ensuing in a merchandise that, when rehydrated, really intently resembles the authentic food.
The approach also prevents the water from being reabsorbed by the foods and therefore decreases its fat significantly.
Most meals items this kind of as fruits, veggies and meats are effectively-suited to freeze-drying, and can be used for prolonged-phrase food storage and preservation.
The Approach of Dehydration
Dehydrating meals is a food preservation technique which has been used for generations. Indigenous Us citizens dehydrated their buffalo kills in their searching camps to make it easier to transport. Pemmican (a dehydrated concoction of buffalo meat mixed with fat and berries) was a staple of many of the nomadic North American tribes. This low-warmth dehydration process concerned possibly air drying (with nearby campfires), or solar drying strips of meat on drying racks.
Dehydrators are a present day technique for little by little removing the moisture from foods with no truly cooking it. A downside of dehydration is the constrained quantity of meals which can be dried at one time. The good facet of dehydration is that this approach of processing for meals storage can be easily carried out at residence.
How Do These Two Approaches Affect the Meals?
Freeze-dried foods preserve significantly of the authentic color, form, aroma and freshness of fruits, greens and meats. Freeze-dried food does not usually contain additives or preservatives, so it remains correct to its unique form. And the search, texture and taste of the foodstuff continues to be soon after re-hydration.
Unlike minimal-heat dehydration, freeze-drying makes it possible for for the preservation of pre-cooked foods, like recipes this kind of as soups, stews, stroganoff, and the like. An obvious benefit is that since the meal was well prepared in its entirety prior to freeze-drying, all you require to do is just add h2o, then heat for a handful of minutes in purchase to produce sumptuous foods.
Rehydrating freeze-dried foods will take just a few minutes, basically by introducing boiling drinking water. Some foodstuff, like numerous fruits and greens, need to have no re-hydration prior to ingesting.
Dehydrated food items shrink during processing as the moisture is taken out. So the foods merchandise itself is considerably smaller sized than its first dimension.
The re-hydration time of dehydrated food items requires a bit longer than freeze-dried, but it stills preferences like the original kind of the meals. Some dehydrated food items incorporate additional components to increase flavors or aid in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and greens can be eaten with out any re-hydration.
Equally strategies of meals preservation increase the extended-phrase storage lifestyle of food. Most commercially produced freeze-dried and dehydrated foods have a shelf daily life of 15 to 20 a long time, if effectively packaged and saved in a awesome, dry environment.
In addition to their being a dependable resource of foods in an crisis or lengthy-time period survival situation, since of their light bodyweight and simplicity of portability, these foodstuff are also wonderful for using on camping, mountaineering and hunting trips. They are also a wise selection to preserve in an emergency street-facet package for the vehicle, or in your bug out bag.
If you decide on to preserve these foods in your car as part of an emergency kit, make sure you don’t forget to rotate them periodically. Temperatures in a vehicle can reach extremes, the two hot and chilly. Higher warmth as nicely as ongoing temperature fluctuations contribute to faster degradation of both dehydrated and freeze-dried foodstuff.
Which Kind is Far better for Intake?
Absolutely everyone is distinct, and every man or woman has their very own individual preferences and preferences. With that in head, there are a couple of items to contemplate before producing a decision in between freeze-dried or dehydrated meals.
Property-developed fruits and greens are much better preserved via dehydration, considering that the regular individual cannot pay for the high priced equipment used in freeze-drying.
Foodstuff utilised in each day cooking and food preparing ought to almost certainly be freeze-dried. This permits the food to be speedily re-hydrated as it is cooked prior to serving. If accessibility and portability are important, than either kind of preserved foods need to satisfy those certain needs. After once more, it really is a matter of individual preferences.
In a nutshell, each dehydrated and freeze-dried food items are superb choices for extended-expression foods storage, as effectively as for daily use or for climbing, tenting, and many others. They each supply light-fat, transportable, practical foods. The main variation is that freeze-dried foods are inclined to greater preserve the shape, texture and flavors of the authentic foodstuff.
Most folks will locate that a mix will perform best for their demands. Single-product meals these kinds of as veggies, potatoes, and other staples and grains are well-suited to reduced-heat dehydration. Freeze-drying is a lot more proper for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a selection of components this kind of as soups, stews and sauces.