Oxygen Absorbers: What You Need to Know

Oxygen Absorbers-what you need to know

Have you ever used oxygen absorbers at home, or are they just the thing you chuck from the bottom of the beef jerky bag? There seems to be some confusion about the point of oxygen absorbers, whether you need to use them, or under what circumstances. But your friendly kitchen self-sufficiency expert is going to help you out <waving—that’s me!>.

What is an Oxygen Absorber?

Don’t get confused between terminology. First, what an oxygen absorber is not: a desiccant is something that absorbs moisture. There are several types of desiccants (nearly all made from Silica, a naturally occurring agent that is usually non-toxic)—some I want nowhere near my food and some I don’t mind. Maybe we’ll talk about that another day. I don’t personally use desiccants in food preservation, choosing instead to use time-tested preservation techniques like keeping food well-sealed in a climate controlled area.

Oxygen Absorbers (sometimes called an “oxygen scavenger”), in contrast, suck up all of the loose air in the sealed container. It combats the most common of all food storage enemies (your others being light, extreme temperature, and vermin—eeewww).

Why should you use Oxygen Absorbers?

Oxygen absorbers extend shelf life, prevent rancidity, delay oxidization, and even helps to preserve the best flavor.

Most people who lose food storage lose it to oxygen. Sometimes a jar lid didn’t seal, and sometimes the mylar bag or vacuum sealed bag gets a tiny little leak. I’ve discovered this stuff in both long and short term food storage. Sometimes it’s user error during processing, and other times it is just the effects of other conditions (like temperature fluctuation in your storage, or jostling the food around).

An oxygen absorber isn’t a permanent fix in situations where you have faulty packaging, but they can buy you time. Do you check your food storage routinely? Do you rotate it so that you are using oldest food first, and are you routinely using your food storage in your daily cooking? All of this prevents loss.

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An oxygen absorber delays loss. It isn’t a permanent fix; it gives you time to find the problem before losing your food. It’s insurance. If you aren’t actually checking your food, rotating it, or routinely using it, then never mind. Don’t bother with using an oxygen absorber at all if you don’t inspect. You’re going to lose a lot of food no matter what.

This is where I pull out my best Mom-Speech about starving children in India.

When should you use Oxygen Absorbers?

All dry, home-packaged food that you plan to keep for 3 months or longer should have an oxygen absorber in the container. This includes dehydrated food, herbs, spices, grain, rice, flour, and salt. There are only two dry items that should not get an oxygen absorber: do not use them in sugar or brown sugar. They dry them out (even though they are not actually desiccants).

What Packaging Should Get an Oxygen Absorber?

Well, anything that stores dry food, but the type of packaging is dependent upon the frequency of access. For instance, all of the dehydrated foods and herbs that I am not currently using get vacuum sealed. Then I place several of those vacuum-sealed bags into a larger, sealed mylar bag (to block out light and to protect from mice and insects). Each individual vacuum-sealed bag gets an oxygen absorber.

If you’re putting your food directly into smaller mylar bags, put an oxygen absorber in that. Stuff going into the freezer—if it’s a dry item (like yeast, flour, etc), chuck one into the container.

My frequently-used stuff—like dehydrated onions, powdered vegetables, and bulk spices—all get an oxygen absorber in the mason jar. This isn’t keeping the food perfectly oxygen free. I am, after all, opening that jar fairly often. It does drastically extend the shelf-life though! I find it also keeps spice blends from getting clumpy (again, working like a desiccant even if they aren’t). The tip to this use is to remember to open and close the jar expediently.

What size of Oxygen Absorber Should I Use?

Anything a quart-sized jar or smaller, a single 50cc is perfect. If you are packing something larger or something with natural air space (granola vs. dense salt), you might want to double up. When you reach the size of a #10 can, you should use three 50cc absorbers.  They come 200 in a pack, and if you re-seal the package as soon as you’re done with it, you’ll be using that same package for awhile.

Use 500cc Oxygen Absorbers for buckets. Wheat, rice, oats, all of which naturally last a long time anyway, should get at least 1 500cc absorber. We often use buckets for storing lots of smaller, sealed food bags. It provides another layer of protection. Wilson always chucks a 500cc absorber in the bucket anyway, regardless that every individual bag contains one. “Cheap insurance,” he says. We have never lost a bag of food sealed in a bucket with an absorber on top.


What is the Process of Using Oxygen Absorbers?

Fast. You use them fast. Wilson and I have a system for this that <yes, we’re dorks> is really fun! When we’re preserving food, it is rarely a bag here-and-there. Oh no, we go big.

Always preserve large quantities of food in smaller, manageable portions. Putting all of your eggs in one basket (I couldn’t resist) is never a good idea. If a mouse gets in to a 10 lb bag of oats, you’ve lost them all. Packing 10 one-pound bags is far more economical in the long-run. So this is how you do it:

  • Place all of the jars or vacuum sealing bags on your table.
  • Wearing gloves, fill all of them with the food to be preserved (using a funnel prevents spills and loss). Gloves, prevent your oils or moisture to contaminate the food.
  • Put the jar lids next to the jars, or have the vacuum sealer ready to go and warmed up.
  • One person opens the bag of absorbers and drops one quickly into each container.
  • The other person runs behind, sealing lids or vacuum-sealing (a bit slower).
  • Once you are done using them from the package, be sure to re-seal that package so that the leftovers will be there when you need them 6 months from now.

Okay, so now you understand the value of using oxygen absorbers to prevent food spoilage–pick up a couple of packs from Pantry Paratus & incorporate them into your food storage plan!


24 thoughts on “Oxygen Absorbers: What You Need to Know

  1. Thanks for this info – it’s really helpful

  2. Thank you for your article. I use oxygen absorbers all the time in my mylar bags. Some of my mylar bags get very tight and hard and mold around the food (ie beans) but others look like they didn’t work – the mylar bag is squishy not firmly molded around the item in the bag (ie soup mixes). What causes this and are the ones that are squishy ok? Thank you.

    1. Michelle,

      I’ve had this too! Okay, so there can be 2 main causes, but in either case it means that there is still oxygen unaccounted for in there. The food naturally has space between & around it. One reason that some bags can stay “squishy” is because there are pockets of air that are blocked by food, so those pockets haven’t succumbed to the absorber. If you “knead” the food a bit, jostle the bag, it should help if this is the case. Most likely, though, you needed to throw in an extra oxygen absorber–not that you really want to cut the bag open & try again. If you have a vacuum sealer where you can re-seal that mylar bag, I do suggest trying that to see if that’s the issue. If not, mark that one for a quicker rotation. Another issue can be if the bag itself has a small hole. If this is the case, the bag usually firms up initially and only gets loose over time.

      1. Incorrect oxygen absorbers scavenge the oxygen Not the air which is why this article is missleadi g Air is made up of more than oxygen. In fact there is less oxygen than nitrogen so what u will find is you have nitrogen bubbles left not oxygen atall. This is fine and won’t prevent the longevity of your food seal.

    2. Oxygen absorber remove the 20 odd percent of the atmosphere that is oxygen leaving the rest of the gases like nitrogen remaining. It’s fine and nothing to worry about. This article is miss leading and incorrect in place.

  3. Thanks for ur help with the purchase… Apron collection… I used to do demos at Walmart, Thus depending upon the demo, if food, I advertised the product – after 3 years I have a ‘collection’!

  4. Thanks for your useful article.

    1. Glad you found it useful!

  5. Great article indeed. A true oxygen absorbers bible 🙂

  6. Quite useful info Chaya. I was looking exactly for that.

  7. I’ve never used oxygen absorbers, but it looks like there are more pros than cons in using it.

    1. Definitely. If I could come up with a con, it’s this–there is only 1 country in the world that manufactures them, and that’s China. It’s in the “con” category simply because many of us distrust what they produce. However, the Impak Corporation version of them have been tested and are generally trusted.

  8. I have never know the whole process of using Oxygen Absorbers. I am always missing something. Thanks for the article. Really Appreciate it.

  9. Thanks Chaya. I recently started testing out storing food in those 2 liter soda bottles. I hadn’t see a funnel like you advertised before. I was using a plastic one from Walmart that they use for changing oil in a car. but I like the idea of getting a stainless steel one that has a built in strainer. great idea. I still use mylar bags too, but the soda bottles seem to work well for storing stuff for like 5 years. it seams that the plastic in the bottles aren’t as good at blocking out the oxygen as a mylar bag is.

  10. It is good to know all the facts regarding the process of using Oxygen Absorbers. Thanks for sharing this useful article!

  11. I want to use oxygen absorbers to help preserve dried herbs but I heard from one source that the oxygen absorbers he used ended up wet, thus ruining what he was storing. Can this happen? Thank you.

    1. Well, I’ve certainly never heard of that. I use them in all of my dehydrated foods. I suppose the question would be how and where he stored the items. Sometimes vacuum-sealed bags can get pin-prick holes and leak, if they are a poor quality of bag or if the food stored is sharp (like a broken piece of dehydrated potato, for instance). I am not saying it could not happen, but the oxygen absorber would not have been wet when he used it, so moisture must have come in another way.

  12. Thanks for the useful information. I’ve never used oxygen absorbers before but after reading your article I will definitely give them a try.

  13. Fantastic article! I have read many articles about o2 absorbers over the past four years or so and thank you for your time and efforts. Found you while searching for more info on this subject.

    I have a question about moisture dessicant. As you mention that you don’t use them, why not? Hypothetically I’m about to pkg&store approximately 200lbs of hard red winter wheat that is about 13%in moisture content. What I’ve learned from the IMPAK site is that they suggest to not place the o2 and the dessicant packets too close to each other as the dessicant can “negatively affect” the o2 packet!! Waiting on a reply from them for clarification on proximity… Not to put you on the spot, but Wilson&Chaya , whats your reasoning for not using dessicants? (Might be time for that dessicant article) ????

    Thank you very much, keeping your site close by! DD

  14. Hello. My question is if I use 50cc or 100cc oxygen absorbers in my 2.5 oz beef jerky pouches(sealed, but not vacuumed packed, with my Food Saver), how long should I write down my expected shelf life or approximate expiration date? I’ve followed USDA dehydration guidelines to get the meat up to 160 degree temperature during the dehydration process to kill any microorganism. I see many Jerky manufacturers list 1 year shelf life on their product. That seems really long and not very fresh.

  15. In recent year I have gained alot of experience in oxygen absorbers by working with Sorbead India and I got to know the advantage of oxygen absorbers.

  16. I recently bought one hundred of the 300cc oxygen absorbers which were then packaged in smaller packs of 10. I used 4 of the absorbers and put the leftover 6 in a pint container. After being in that container for a while I noticed moisture forming in the jar.
    Should these absorbers be thrown out?

  17. Hello, I found this post while looking for an answer to the following question:
    If you can only partly open a #10 can of dried vegetables that has an oxygen absorber and have to leave the can that way until you can get a can opener capable of finishing the job of opening the can, such that you can’t remove the oxygen absorber right away, will that cause any kind of food safety problem? Thanks for any answer you can provide.

  18. what are quality tests for an oxygen absorber?

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