The Method 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, flavor, aroma and dietary value.
The process calls for that the new or cooked food be speedily frozen at temperatures as reduced as -50°C. The frozen foods is then placed into a vacuum chamber. This vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this particular temperature and force, the ice crystals in the food evaporate into h2o vapor, bypassing water’s liquid sort, through a method known as sublimation.
This process preserves the mobile framework and dietary material of the foodstuff, ensuing in a merchandise that, when rehydrated, extremely carefully resembles the authentic foodstuff.
The procedure also prevents the drinking water from getting reabsorbed by the meals and as a result decreases its bodyweight considerably.
Most foods things such as fruits, vegetables and meats are effectively-suited to freeze-drying, and can be used for prolonged-phrase foodstuff storage and preservation.
The Method of Dehydration
Dehydrating meals is a food preservation approach which has been utilised for generations. Native Americans dehydrated their buffalo kills in their looking camps to make it easier to transport. Pemmican (a dehydrated concoction of buffalo meat combined with fat and berries) was a staple of numerous of the nomadic North American tribes. This low-warmth dehydration process included either air drying (with nearby campfires), or sunlight drying strips of meat on drying racks.
Dehydrators are a modern day technique for slowly and gradually getting rid of the dampness from foodstuff without having truly cooking it. A disadvantage of dehydration is the restricted volume of foodstuff which can be dried at one particular time. Sour And Sweets of dehydration is that this method of processing for foodstuff storage can be effortlessly carried out at home.
How Do These Two Approaches Influence the Food?
Freeze-dried meals preserve much of the authentic colour, form, aroma and freshness of fruits, veggies and meats. Freeze-dried meals does not typically incorporate additives or preservatives, so it stays accurate to its unique sort. And the look, texture and taste of the meals remains soon after re-hydration.
Unlike low-warmth dehydration, freeze-drying makes it possible for for the preservation of pre-cooked meals, like recipes this kind of as soups, stews, stroganoff, and the like. An evident reward is that considering that the food was prepared in its entirety prior to freeze-drying, all you require to do is simply insert water, then warmth for a few minutes in buy to develop sumptuous foods.
Rehydrating freeze-dried meals requires just a handful of minutes, merely by adding boiling h2o. Some food items, like numerous fruits and vegetables, need no re-hydration before taking in.
Dehydrated food items shrink throughout processing as the dampness is removed. So the foodstuff merchandise alone is noticeably smaller than its original dimension.
The re-hydration time of dehydrated foods requires a little bit lengthier than freeze-dried, but it stills preferences like the first form of the foodstuff. Some dehydrated meals contain additional elements to enhance flavors or help in preservation. As with freeze-dried fruits and greens, dehydrated fruits and veggies can be eaten with no any re-hydration.
Both strategies of foods preservation increase the long-term storage daily life of food. Most commercially created freeze-dried and dehydrated meals have a shelf life of 15 to twenty several years, if correctly packaged and stored in a amazing, dry setting.
In addition to their currently being a reliable resource of meals in an emergency or long-phrase survival circumstance, since of their gentle weight and relieve of portability, these meals are also fantastic for using on camping, climbing and hunting trips. They are also a smart choice to preserve in an crisis street-aspect kit for the car, or in your bug out bag.
If you decide on to hold these foods in your car as element of an unexpected emergency package, make sure you keep in mind to rotate them periodically. Temperatures in a auto can attain extremes, equally hot and cold. Large warmth as properly as steady temperature fluctuations contribute to faster degradation of both dehydrated and freeze-dried food items.
Which Sort is Greater for Use?
Every person is various, and each and every man or woman has their very own individual tastes and choices. With that in brain, there are a couple of issues to take into account ahead of making a decision between freeze-dried or dehydrated meals.
Property-grown fruits and greens are much better preserved through dehydration, because the regular man or woman cannot find the money for the high priced equipment used in freeze-drying.
Food items utilized in daily cooking and meal preparing need to possibly be freeze-dried. This permits the food to be rapidly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than possibly type of preserved foods need to meet up with individuals certain demands. As soon as once more, it’s a make a difference of personal preferences.
In a nutshell, both dehydrated and freeze-dried foods are excellent selections for long-expression food storage, as nicely as for everyday use or for mountaineering, tenting, and many others. They both give light-weight-excess weight, transportable, practical foods. The major variation is that freeze-dried food items tend to greater protect the form, texture and flavors of the first food.
Most people will find that a mixture will perform greatest for their wants. Solitary-merchandise foods this sort of as greens, potatoes, and other staples and grains are properly-suited to lower-heat 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.