The Method of Freeze-Drying
Freeze-drying is a complicated approach of preserving fresh or presently-cooked foodstuff by getting rid of up to ninety eight% of the food’s humidity, leaving intact the food’s texture, flavor, aroma and nutritional price.
The approach requires that the new or cooked food be swiftly frozen at temperatures as minimal as -50°C. The frozen foods is then positioned 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 foods evaporate into water vapor, bypassing water’s liquid type, by means of a approach known as sublimation.
This procedure preserves the cell structure and dietary material of the food, resulting in a merchandise that, when rehydrated, quite intently resembles the original foodstuff.
The procedure also prevents the drinking water from becoming reabsorbed by the meals and as a result decreases its excess weight substantially.
Most foods objects such as fruits, vegetables and meats are nicely-suited to freeze-drying, and can be utilised for extended-time period foodstuff storage and preservation.
ขับถ่ายยาก The Approach of Dehydration
Dehydrating foods is a foods preservation strategy which has been employed for centuries. Native Americans dehydrated their buffalo kills in their hunting camps to make it easier to transportation. Pemmican (a dehydrated concoction of buffalo meat combined with body fat and berries) was a staple of a lot of of the nomadic North American tribes. This lower-heat dehydration approach associated possibly air drying (with close by campfires), or sunlight drying strips of meat on drying racks.
Dehydrators are a present day method for little by little taking away the humidity from food with out truly cooking it. A downside of dehydration is the restricted sum of foods which can be dried at a single time. The positive facet of dehydration is that this approach of processing for meals storage can be very easily accomplished at house.
How Do These Two Approaches Influence the Foods?
Freeze-dried food items preserve considerably of the unique color, shape, aroma and freshness of fruits, vegetables and meats. Freeze-dried foods does not typically have additives or preservatives, so it remains correct to its first form. And the search, texture and flavor of the meals continues to be soon after re-hydration.
Not like lower-warmth dehydration, freeze-drying permits for the preservation of pre-cooked foods, including recipes this sort of as soups, stews, stroganoff, and the like. An clear advantage is that given that the food was ready in its entirety prior to freeze-drying, all you require to do is simply add drinking water, then heat for a handful of minutes in buy to produce sumptuous foods.
Rehydrating freeze-dried meals requires just a few minutes, basically by incorporating boiling h2o. Some meals, like several fruits and vegetables, need to have no re-hydration prior to ingesting.
Dehydrated foodstuff shrink throughout processing as the humidity is taken out. So the foods merchandise by itself is noticeably smaller sized than its first size.
The re-hydration time of dehydrated meals requires a little bit for a longer time than freeze-dried, but it stills tastes like the first type of the meals. Some dehydrated food items incorporate extra substances to enhance flavors or aid in preservation. As with freeze-dried fruits and vegetables, dehydrated fruits and vegetables can be eaten with no any re-hydration.
Both strategies of foods preservation increase the long-phrase storage lifestyle of foodstuff. Most commercially produced freeze-dried and dehydrated foods have a shelf existence of 15 to 20 several years, if appropriately packaged and saved in a awesome, dry environment.
In addition to their becoming a reputable source of foodstuff in an unexpected emergency or lengthy-phrase survival situation, due to the fact of their light-weight weight and relieve of portability, these foodstuff are also excellent for getting on tenting, mountaineering and searching outings. They are also a clever choice to hold in an crisis street-facet package for the automobile, or in your bug out bag.
If you choose to keep these foodstuff in your car as component of an crisis kit, please don’t forget to rotate them periodically. Temperatures in a vehicle can get to extremes, both hot and chilly. Substantial warmth as properly as constant temperature fluctuations add to quicker degradation of the two dehydrated and freeze-dried foods.
Which Kind is Much better for Intake?
Everyone is various, and each and every person has their personal personal tastes and preferences. With that in brain, there are a handful of things to take into account just before making a determination between freeze-dried or dehydrated foods.
Property-developed fruits and vegetables are greater preserved through dehydration, because the average man or woman can not find the money for the expensive machinery used in freeze-drying.
Foodstuff employed in everyday cooking and food preparing should probably be freeze-dried. This permits the food to be swiftly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than both kind of preserved meals must meet up with people distinct needs. As soon as once again, it truly is a issue of private tastes.
In a nutshell, both dehydrated and freeze-dried foodstuff are excellent options for extended-term food storage, as properly as for every day use or for hiking, tenting, and many others. They the two give mild-excess weight, transportable, convenient foodstuff. The main variation is that freeze-dried foodstuff are likely to far better maintain the condition, texture and flavors of the unique food.
Most people will find that a mix will work ideal for their needs. One-item foods this sort of as vegetables, potatoes, and other staples and grains are properly-suited to low-heat dehydration. Freeze-drying is more acceptable for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a selection of ingredients this kind of as soups, stews and sauces.