The Approach of Freeze-Drying
Freeze-drying is a complicated procedure of preserving refreshing or presently-cooked meals by getting rid of up to ninety eight% of the food’s dampness, leaving intact the food’s texture, taste, aroma and dietary worth.
The process demands that the new or cooked foodstuff be rapidly frozen at temperatures as low as -50°C. The frozen food is then placed into a vacuum chamber. 火鍋食材 vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this specific temperature and pressure, the ice crystals in the food evaporate into water vapor, bypassing water’s liquid form, through a procedure called sublimation.
This method preserves the mobile construction and dietary articles of the meals, ensuing in a merchandise that, when rehydrated, very carefully resembles the unique foods.
The procedure also stops the drinking water from being reabsorbed by the meals and hence decreases its weight drastically.
Most foods products such as fruits, vegetables and meats are properly-suited to freeze-drying, and can be utilized for long-time period food storage and preservation.
The Procedure of Dehydration
Dehydrating foodstuff is a food preservation approach which has been employed for hundreds of years. Native Us citizens dehydrated their buffalo kills in their hunting camps to make it easier to transport. Pemmican (a dehydrated concoction of buffalo meat mixed with excess fat and berries) was a staple of several of the nomadic North American tribes. This reduced-warmth dehydration method included both air drying (with nearby campfires), or solar drying strips of meat on drying racks.
Dehydrators are a present day technique for little by little taking away the moisture from food with no in fact cooking it. A drawback of dehydration is the limited sum of food which can be dried at one particular time. The constructive element of dehydration is that this technique of processing for food storage can be very easily completed at property.
How Do These Two Approaches Have an effect on the Foodstuff?
Freeze-dried foodstuff preserve considerably of the authentic coloration, condition, aroma and freshness of fruits, vegetables and meats. Freeze-dried meals does not typically have additives or preservatives, so it continues to be correct to its original type. And the search, texture and taste of the food continues to be following re-hydration.
As opposed to lower-warmth dehydration, freeze-drying makes it possible for for the preservation of pre-cooked meals, such as recipes this kind of as soups, stews, stroganoff, and the like. An apparent benefit is that since the food was ready in its entirety prior to freeze-drying, all you require to do is just include drinking water, then heat for a couple of minutes in buy to generate sumptuous meals.
Rehydrating freeze-dried meals will take just a number of minutes, simply by including boiling h2o. Some meals, like numerous fruits and vegetables, need no re-hydration prior to taking in.
Dehydrated foodstuff shrink throughout processing as the humidity is taken out. So the foods product alone is noticeably more compact than its authentic dimension.
The re-hydration time of dehydrated foods requires a little bit longer than freeze-dried, but it stills preferences like the unique sort of the meals. Some dehydrated foodstuff contain added ingredients to increase flavors or aid in preservation. As with freeze-dried fruits and veggies, dehydrated fruits and veggies can be eaten with no any re-hydration.
Both techniques of food preservation enhance the prolonged-term storage existence of food. Most commercially made freeze-dried and dehydrated food items have a shelf existence of fifteen to 20 many years, if effectively packaged and stored in a great, dry atmosphere.
In addition to their being a reliable supply of foodstuff in an crisis or extended-phrase survival situation, since of their gentle bodyweight and ease of portability, these food items are also great for taking on camping, mountaineering and hunting excursions. They are also a wise choice to maintain in an unexpected emergency highway-side kit for the auto, or in your bug out bag.
If you decide on to maintain these foods in your car as element of an unexpected emergency package, remember to keep in mind to rotate them periodically. Temperatures in a auto can achieve extremes, the two hot and chilly. High heat as effectively as constant temperature fluctuations lead to a lot quicker degradation of each dehydrated and freeze-dried foodstuff.
Which Variety is Far better for Usage?
Everybody is different, and every single man or woman has their possess individual tastes and choices. With that in brain, there are a handful of items to take into account just before generating a decision between freeze-dried or dehydrated foodstuff.
Property-grown fruits and veggies are greater preserved by means of dehydration, considering that the average man or woman are not able to manage the pricey machinery used in freeze-drying.
Foods utilized in each day cooking and food planning should possibly be freeze-dried. This permits the meals to be speedily re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than either kind of preserved foods need to meet these certain demands. As soon as yet again, it’s a issue of private preferences.
In a nutshell, each dehydrated and freeze-dried foods are excellent choices for prolonged-expression foods storage, as well as for every day use or for climbing, camping, and many others. They the two give light-excess weight, portable, handy food items. The primary variation is that freeze-dried foodstuff tend to better preserve the condition, texture and flavors of the original meals.
Most individuals will discover that a blend will work ideal for their wants. One-product foodstuff such as vegetables, potatoes, and other staples and grains are effectively-suited to minimal-heat dehydration. Freeze-drying is much more proper for meats and fruits (whose texture can be preserved), and for pre-cooked meals with a selection of components this sort of as soups, stews and sauces.