The Process of Freeze-Drying
Freeze-drying is a complicated procedure of preserving refreshing or presently-cooked meals by eliminating up to ninety eight% of the food’s moisture, leaving intact the food’s texture, taste, aroma and nutritional value.
The approach demands that the fresh or cooked foodstuff be quickly frozen at temperatures as lower as -50°C. The frozen meals is then positioned into a vacuum chamber. This vacuum chamber lowers the stress, and raises the temperature to just about 0°C.
At this distinct temperature and strain, the ice crystals in the foodstuff evaporate into h2o vapor, bypassing water’s liquid sort, by means of a process known as sublimation.
This process preserves the cell structure and dietary material of the meals, ensuing in a item that, when rehydrated, quite carefully resembles the first foodstuff.
The approach also stops the water from being reabsorbed by the foods and as a result decreases its bodyweight substantially.
Most meals items this sort of as fruits, vegetables and meats are well-suited to freeze-drying, and can be utilized for prolonged-term foodstuff storage and preservation.
verse tijm bestellen of Dehydration
Dehydrating meals is a food preservation approach which has been utilized for generations. Indigenous Americans dehydrated their buffalo kills in their hunting camps to make it less difficult to transport. Pemmican (a dehydrated concoction of buffalo meat blended with unwanted fat and berries) was a staple of a lot of of the nomadic North American tribes. This lower-warmth dehydration procedure included both air drying (with nearby campfires), or sunlight drying strips of meat on drying racks.
Dehydrators are a modern strategy for gradually getting rid of the moisture from food without having really cooking it. A drawback of dehydration is the restricted sum of meals which can be dried at 1 time. The constructive facet of dehydration is that this strategy of processing for food storage can be effortlessly accomplished at house.
How Do These Two Approaches Have an effect on the Meals?
Freeze-dried food items maintain a lot of the unique colour, condition, aroma and freshness of fruits, veggies and meats. Freeze-dried food does not usually include additives or preservatives, so it stays accurate to its original kind. And the appear, texture and taste of the food remains following re-hydration.
In contrast to minimal-warmth dehydration, freeze-drying enables for the preservation of pre-cooked foods, such as recipes these kinds of as soups, stews, stroganoff, and the like. An obvious gain is that since the food was prepared in its entirety prior to freeze-drying, all you require to do is just insert h2o, then heat for a number of minutes in buy to generate sumptuous foods.
Rehydrating freeze-dried meals requires just a couple of minutes, just by including boiling drinking water. Some foodstuff, like numerous fruits and veggies, want no re-hydration just before ingesting.
Dehydrated food items shrink in the course of processing as the dampness is eliminated. So the food merchandise alone is significantly more compact than its original dimensions.
The re-hydration time of dehydrated food items will take a bit longer than freeze-dried, but it stills tastes like the authentic form of the foodstuff. Some dehydrated meals have additional components to increase flavors or support in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten without having any re-hydration.
Both strategies of food preservation increase the extended-time period storage daily life of foods. Most commercially created freeze-dried and dehydrated foodstuff have a shelf life of 15 to 20 years, if properly packaged and stored in a cool, dry surroundings.
In addition to their getting a trustworthy resource of food in an unexpected emergency or prolonged-time period survival situation, because of their gentle excess weight and ease of portability, these foods are also great for using on camping, hiking and looking excursions. They are also a smart option to maintain in an crisis road-facet kit for the vehicle, or in your bug out bag.
If you pick to preserve these foods in your automobile as element of an unexpected emergency kit, remember to bear in mind to rotate them periodically. Temperatures in a automobile can reach extremes, equally scorching and cold. High warmth as properly as steady temperature fluctuations lead to quicker degradation of the two dehydrated and freeze-dried foodstuff.
Which Variety is Much better for Use?
Everyone is diverse, and every single particular person has their very own personalized tastes and choices. With that in brain, there are a number of items to take into account before creating a choice amongst freeze-dried or dehydrated meals.
Property-developed fruits and vegetables are far better preserved by way of dehydration, considering that the regular man or woman can’t afford the expensive equipment used in freeze-drying.
Foods used in every day cooking and meal planning should most likely be freeze-dried. This permits the meals to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than either variety of preserved foods should meet these distinct demands. When yet again, it is a issue of personal choices.
In a nutshell, each dehydrated and freeze-dried foodstuff are outstanding choices for lengthy-time period foodstuff storage, as well as for daily use or for mountaineering, camping, and many others. They the two provide gentle-bodyweight, transportable, convenient food items. The principal distinction is that freeze-dried foods tend to better maintain the form, texture and flavors of the original meals.
Most folks will find that a blend will work best for their wants. One-item foodstuff this sort of as greens, potatoes, and other staples and grains are effectively-suited to lower-warmth dehydration. Freeze-drying is more acceptable for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a selection of substances these kinds of as soups, stews and sauces.
