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QUESTION: I've read Alex Lopez-Ortiz's fine FAQ (thanks for all the info) and am curious
whether anyone's expermented with vacuum store. I recently purchased a
vacuum storage device via an infomercial, and am very happy using it with
other food products. On the infomercial, they said not to freeze coffee
beans, because it would dry out the oils, but rather to vacuum store them. Was
this propaganda, or did they have something there?
ANSWER: Vacuum storage is not a good idea. Let us look at it for a moment.
If a vacuum is pulled in a container with coffee in it, the carbon dioxide in
the space between the cells are extracted. It is probably ok if that coffee is
completely used up the next time the can is opened.
If not, when the can is opened, air enters and now occupies all the space in
the coffee that previously had carbon dioxide and has been evacuated. You can
not store this coffee any more because it will deteriorate quickly; faster than
if no vacuum had been pulled.
If you want to store coffee, store it in a container where the air has been
replaced with carbon dioxide, or at least nitrogen.
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