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Thread: Exactly how long do beans de-gas for???

  1. #1
    Member
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    May 2006
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    47

    Exactly how long do beans de-gas for???

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all,

    Recently I bought a vacuum sealing machine. My plan was to use it to keep coffee beans fresh for longer. When I first got the machine I couldnt help myself and I vacuum sealed some beans that had just been roasted. It was no surprise when the bag puffed up, and I wasnt that worried.

    But for the second attempt I left the beans to de-gas for 48 hours, assuming that this would be more than enough time. I vacuum sealed these beans, went to NZ for a week and when I got back the bag looked like it was ready to burst!

    How long do beans continue de-gassing for? Will they ever actually stop? Will I ever be able to properly vacuum seal beans without the bag puffing up?

    I also brew beer so the vacuum sealer has benefits for storing those ingredients too, so its not a total waste, but I really would like to use it for coffee too!

  2. #2
    Senior Member
    Join Date
    Jul 2006
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    3,498

    Re: Exactly how long do beans de-gas for???

    Hi T.D.

    Seeing you are also a brewer - would you vacuum seal a bottle of beer?

    The answer of course is NO!!!

    Roasted beans eventually stop degassing - but at that stage they are stale!! And that is how the "Supermarket" vacuum bags are packed - with stale beans!!

    The crema we all love and want is a combination of carbon dioxide (produced during the roasting process) - and volatile oils (the flavour of the coffee). After a few days the gas pressure inside the beans stabilizes - to atmospheric pressure - and they stop degassing. Apply a vacuum and you suck out more of the carbon dioxide and volatile oils (being volatile a vacuum causes them to "boil off") ....

    You can vacuum store them- they will keep longer but taste flat with little or no crema- just like a vacuum sealed bottle of beer!!!

    The best storage method is one way valved opaque bags, in a cool, dry, dark place..... the carbon dioxide and volatile oils will still decrease (the carbon dioxide being slowly replaced by air and the volatile oils slowly becoming rancid due to oxidation) - so use them within three weeks of roasting.....

    Vacuum sealing and/or storing in a fridge/freezer are not good for roasted beans!


  3. #3
    Member
    Join Date
    May 2006
    Posts
    47

    Re: Exactly how long do beans de-gas for???

    Thanks JavaB, thats exactly the info I was after! Ill reserve the vacuum sealer for beer only then (well, the hops anyway, not the final product! :P )

    Thanks again :)


  4. #4
    Senior Member
    Join Date
    Oct 2006
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    178

    Re: Exactly how long do beans de-gas for???

    the beans would sure smell nice though ;)



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