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After meals has been freeze dried what else could be completed to protect it?
The freeze drying course of removes 98% of the water from meals, stopping bacterial progress in addition to killing bugs and their eggs.
Past freeze drying additional to protect meals and enhance shelf life, oxygen is the principle enemy. If the meals is saved in a approach that it’s not uncovered to oxygen, the shelf life can attain 25 to 30 years. Shelf life right here refers back to the meals sustaining it is properties of dietary worth, style, and look. It might nonetheless be fit for human consumption past this time however the aforementioned properties are degraded. Oxygen Absorbers
Some freeze dried meals producers use oxygen absorbers to increase shelf life.
Oxygen absorbers are supplies that chemically react with oxygen within the atmosphere they’re in, combining with the oxygen and thus eradicating it from that atmosphere. Essentially the most generally used materials for absorbers is iron within the types of iron powder or iron carbonate. Each mix with oxygen very successfully.
As soon as oxygen absorbers are uncovered to oxygen they’ll proceed to react with it till the fabric is totally “oxidized” that means it cannot soak up any extra oxygen. Because of this they have to be very fastidiously sealed and saved in order that they don’t seem to be consumed earlier than their supposed use.
The appliance wherein oxygen absorbers are used for freeze dried meals storage is to put them within the can of meals earlier than it’s vacuum sealed.
The thought is that any oxygen that leaks into the sealed container over years of storage will likely be absorbed by it, somewhat than the oxygen reacting with the freeze dried meals and degrading it.
There are two sorts of oxygen absorbers generally used. One kind, Multisorb Applied sciences’ FreshPax Sort-B requires some moisture from the atmosphere it’s in to be current to work and is used for moist meals like bread and processed meats. Sort-D absorbers comprise there personal moisture supply and are thus suited to dry meals like freeze dried meals.
You could bear in mind the previous adage Aristotle proclaimed in 350 BC, “nature abhors a vacuum”. So any vacuum packed container will over time be invaded, if ever so barely, by the encircling air and with it the 21% of air that’s oxygen.
So whereas the oxygen absorber will prolong the shelf life by absorbing the oxygen within the air that’s current initially throughout packing in addition to the air that leaks in over time, ultimately the absorber will likely be “maxed out”, that’s it is going to be totally oxidized and cannot soak up any extra oxygen.
I’ve seen the ensures for shelf life for this kind packed freeze dried meals at 10-15 years. This era could also be a mirrored image of the restrict of the method and course of controls that the producer of the meals makes use of, in addition to that of the oxygen absorber. web site?sl=ar&tl=en&hl=en&u=/”>
Nitrogen Packing
Nitrogen packing or “nitro-pak” however takes a distinct method to coping with oxygen “enemy”.
Slightly than counting on the properties of the container to combat the invading air attempting to get in, the container is flushed with nitrogen or packed in a nitrogen atmosphere. Because of this the sealed container has the identical or barely greater stress however with nitrogen and never air. Because of this air is just not preventing to get in. There is no such thing as a abhorrence so to talk.
Thus the interval that the meals stays unexposed to vital concentrations of oxygen is for much longer and thus the doable shelf life is longer.
What’s the longest shelf life for nitrogen packed freeze dried meals?
Mountain Home, the business model of Oregon Freeze Dry which has been round for over 40 years, states on their website concerning their #10 cans of freeze dried meals;
“Our meals can have the longest shelf life accessible…as much as 30 years!”
It might be the results of superior course of controls, not solely the nitrogen packing course of, that makes them really feel snug making this assertion.
There may be data on-line on how one can nitro-pak meals your self with some tools however I might be leery of assuming your course of management can be on the identical par and have the identical shelf life.
In any case “nitro-pak” freeze dried meals has the longest shelf life for any kind of commercially accessible saved meals I’ve seen.
