The Procedure of Freeze-Drying
Freeze-drying is a complex approach of preserving fresh or already-cooked meals by getting rid of up to 98% of the food’s humidity, leaving intact the food’s texture, taste, aroma and nutritional price.
The approach demands that the fresh or cooked foods be quickly frozen at temperatures as reduced as -50°C. The frozen foods is then put 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 sort, via a approach known as sublimation.
This approach preserves the cell structure and nutritional articles of the food, resulting in a solution that, when rehydrated, quite closely resembles the first meals.
The approach also prevents the drinking water from being reabsorbed by the foods and thus decreases its fat substantially.
Most foods things these kinds of as fruits, vegetables and meats are effectively-suited to freeze-drying, and can be utilized for prolonged-expression foods storage and preservation.
The Approach of Dehydration
Dehydrating foodstuff is a foodstuff preservation technique which has been employed for hundreds of years. Indigenous Us citizens dehydrated their buffalo kills in their searching camps to make it easier 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 low-heat dehydration process concerned possibly air drying (with close by campfires), or sun drying strips of meat on drying racks.
Dehydrators are a contemporary technique for slowly and gradually eliminating the dampness from meals without really cooking it. A disadvantage of dehydration is the constrained sum of foodstuff which can be dried at one particular time. The optimistic facet of dehydration is that this approach of processing for food storage can be easily accomplished at house.
How Do These Two Methods Affect the Foods?
Freeze-dried food items preserve significantly of the unique shade, form, aroma and freshness of fruits, veggies and meats. Freeze-dried meals does not usually incorporate additives or preservatives, so it stays true to its authentic form. And the appear, texture and taste of the meals continues to be after re-hydration.
Unlike Nigerian food in Hong Kong -heat dehydration, freeze-drying enables for the preservation of pre-cooked meals, which includes recipes these kinds of as soups, stews, stroganoff, and the like. An clear benefit is that since the food was prepared in its entirety prior to freeze-drying, all you need to do is basically insert water, then heat for a number of minutes in get to produce sumptuous foods.
Rehydrating freeze-dried food takes just a number of minutes, merely by including boiling h2o. Some foodstuff, like numerous fruits and greens, need to have no re-hydration before eating.
Dehydrated meals shrink for the duration of processing as the dampness is taken off. So the meals merchandise itself is significantly scaled-down than its unique dimensions.
The re-hydration time of dehydrated foodstuff requires a little bit lengthier than freeze-dried, but it stills tastes like the authentic kind of the food. Some dehydrated meals have added substances to improve flavors or aid in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten with out any re-hydration.
The two approaches of foodstuff preservation enhance the prolonged-phrase storage lifestyle of food. Most commercially created freeze-dried and dehydrated meals have a shelf lifestyle of 15 to 20 several years, if effectively packaged and saved in a cool, dry atmosphere.
In addition to their getting a trustworthy source of food in an unexpected emergency or long-expression survival situation, because of their gentle weight and ease of portability, these foods are also great for getting on camping, hiking and searching excursions. They are also a clever option to keep in an crisis road-facet kit for the car, or in your bug out bag.
If you select to keep these foodstuff in your vehicle as portion of an crisis package, remember to bear in mind to rotate them periodically. Temperatures in a vehicle can achieve extremes, both scorching and chilly. High heat as well as continuous temperature fluctuations contribute to faster degradation of each dehydrated and freeze-dried foods.
Which Variety is Much better for Intake?
Everybody is different, and each and every individual has their personal personal preferences and choices. With that in brain, there are a couple of items to consider just before making a determination among freeze-dried or dehydrated meals.
House-grown fruits and veggies are much better preserved by means of dehydration, given that the regular man or woman cannot afford the pricey equipment employed in freeze-drying.
Foodstuff used in every day cooking and meal preparation must probably be freeze-dried. This permits the foods to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are essential, than either type of preserved meals must fulfill these particular demands. As soon as once more, it’s a issue of personal choices.
In a nutshell, both dehydrated and freeze-dried food items are excellent choices for long-term meals storage, as nicely as for every day use or for climbing, tenting, and so forth. They the two supply light-weight-bodyweight, transportable, hassle-free foods. The main variation is that freeze-dried food items are inclined to far better maintain the form, texture and flavors of the unique foodstuff.
Most folks will find that a mix will perform greatest for their requirements. Solitary-merchandise foods this sort of as veggies, potatoes, and other staples and grains are nicely-suited to lower-warmth dehydration. Freeze-drying is much more acceptable for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a variety of substances such as soups, stews and sauces.