The Method of Freeze-Drying
Freeze-drying is a complex procedure of preserving clean or previously-cooked foods by getting rid of up to 98% of the food’s humidity, leaving intact the food’s texture, flavor, aroma and nutritional value.
The method requires that the clean or cooked food be quickly frozen at temperatures as minimal as -50°C. The frozen foodstuff is then put into a vacuum chamber. This vacuum chamber lowers the stress, and raises the temperature to just about 0°C.
At this distinct temperature and stress, the ice crystals in the foods evaporate into water vapor, bypassing water’s liquid sort, by means of a method referred to as sublimation.
This process preserves the cell composition and dietary content of the foodstuff, resulting in a merchandise that, when rehydrated, extremely carefully resembles the original food.
The approach also stops the drinking water from currently being reabsorbed by the food and as a result decreases its bodyweight substantially.
Most meals products such as fruits, veggies and meats are effectively-suited to freeze-drying, and can be employed for prolonged-phrase foodstuff storage and preservation.
The Process of Dehydration
Dehydrating foods is a foodstuff preservation strategy which has been employed for generations. Native People in america dehydrated their buffalo kills in their searching camps to make it less complicated to transport. Pemmican (a dehydrated concoction of buffalo meat blended with fat and berries) was a staple of many of the nomadic North American tribes. This reduced-warmth dehydration approach involved both air drying (with nearby campfires), or sunshine drying strips of meat on drying racks.
Dehydrators are a modern day approach for little by little getting rid of the moisture from meals without having actually cooking it. A disadvantage of dehydration is the limited volume of foods which can be dried at a single time. The good facet of dehydration is that this approach of processing for foods storage can be simply carried out at property.
How Do These Two Methods Have an effect on the Meals?
Freeze-dried foodstuff protect significantly of the original color, form, aroma and freshness of fruits, greens and meats. Freeze-dried meals does not generally contain additives or preservatives, so it continues to be true to its first kind. And the look, texture and flavor of the food continues to be after re-hydration.
Unlike lower-heat dehydration, freeze-drying permits for the preservation of pre-cooked meals, including recipes such as soups, stews, stroganoff, and the like. An obvious advantage is that because the meal was ready in its entirety prior to freeze-drying, all you need to have to do is basically insert drinking water, then warmth for a few minutes in purchase to generate sumptuous foods.
Rehydrating freeze-dried foods takes just a few minutes, merely by adding boiling water. Some foods, like a lot of fruits and vegetables, require no re-hydration just before taking in.
Dehydrated foodstuff shrink throughout processing as the moisture is removed. So the food merchandise alone is substantially scaled-down than its original size.
Ghana food in Kong Kong -hydration time of dehydrated foodstuff normally takes a little bit more time than freeze-dried, but it stills preferences like the original sort of the meals. Some dehydrated foodstuff contain added elements to increase flavors or assist in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten with no any re-hydration.
Both techniques of foods preservation enhance the lengthy-phrase storage life of foodstuff. Most commercially developed freeze-dried and dehydrated foods have a shelf existence of 15 to 20 many years, if effectively packaged and stored in a amazing, dry setting.
In addition to their becoming a dependable resource of meals in an unexpected emergency or extended-time period survival circumstance, simply because of their gentle weight and ease of portability, these meals are also excellent for having on camping, hiking and hunting journeys. They are also a sensible selection to preserve in an emergency highway-side kit for the automobile, or in your bug out bag.
If you decide on to keep these meals in your vehicle as part of an unexpected emergency kit, you should keep in mind to rotate them periodically. Temperatures in a vehicle can achieve extremes, the two hot and cold. Substantial heat as effectively as continuous temperature fluctuations add to more quickly degradation of each dehydrated and freeze-dried meals.
Which Variety is Much better for Intake?
Everybody is different, and each particular person has their personal individual preferences and choices. With that in mind, there are a couple of things to think about prior to producing a choice among freeze-dried or dehydrated foodstuff.
House-developed fruits and vegetables are much better preserved via dehydration, because the average individual can’t find the money for the high priced equipment employed in freeze-drying.
Foodstuff employed in each day cooking and food planning should probably be freeze-dried. This permits the foods to be swiftly re-hydrated as it is cooked prior to serving. If accessibility and portability are crucial, than both kind of preserved foods must satisfy people particular requirements. Once once again, it’s a issue of individual tastes.
In a nutshell, each dehydrated and freeze-dried foods are excellent choices for extended-phrase meals storage, as nicely as for every day use or for climbing, camping, etc. They each provide light-fat, portable, practical meals. The major big difference is that freeze-dried meals have a tendency to much better maintain the condition, texture and flavors of the original foodstuff.
Most folks will discover that a mix will perform ideal for their demands. Single-product meals this sort of as greens, potatoes, and other staples and grains are properly-suited to reduced-warmth dehydration. Freeze-drying is a lot more appropriate for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a range of components these kinds of as soups, stews and sauces.