[Homeroast] Using CO2 to preserve freshness?
roast at homeroaster.com
Tue Apr 20 23:49:05 CDT 2010
Although CO2 and oxygen are both involved in the staling process of roasted
coffee, there are also many other reactions, too numerous to detail, and
many that are undocumented, that enter into the process. Suffice to say,
roasted coffee changes over time. Some of those changes are regarded as
positive by some, and negative for others. I like coffee fresh from the
roaster. Others like to rest beans for weeks. Whatever you call it, it is
a staling process that includes oxidation, vaporization of volatile oils,
evaporation of flavonoids and aromas, chemical leeching, probably acids and
bases combining, oils turning rancid, and who knows what else.
Removing oxygen by replacing it with nitrogen or CO2 only removes one part
of the staling process. Roasted beans have been shipped in nitrogen flushed
Mylar bags since the '70's. I know this to be true because White Coffee
Company in Long Island City shipped beans to my coffeehouse business in the
late '70's in Mylar bags flushed with nitrogen. I really believe that the
most complete way to delay the staling process is to freeze the roasted
beans at 0F or colder.
"to absurdity and beyond!"
----- Original Message -----
From: "Joseph Robertson" <theotherjo at gmail.com>
To: "A list to discuss home coffee roasting. There are rules for this
list,available at http://www.sweetmarias.com/maillistinfo.html"
<homeroast at lists.sweetmariascoffee.com>
Sent: Tuesday, April 20, 2010 5:32 PM
Subject: Re: [Homeroast] Using CO2 to preserve freshness?
> Do you think that is because of so much contact with Co2 compared to no
> with gas contact?
> On Tue, Apr 20, 2010 at 5:31 AM, Ed Needham <roast at homeroaster.com> wrote:
>> For the record, coffee sealed in an airtight or loosely tight container
>> will be much worse at 30+ days than coffee beans left to the open air.
>> Those stored will have rancid smell and nasty taste, where those left to
>> open air will be stale and lifeless, but the taste will be tolerable.
>> Definitely not a goal for homeroasters, but interesting on it's own.
>> Ed Needham
>> "to absurdity and beyond!"
>> ----- Original Message ----- From: "Mike Koenig" <koenig.mike at gmail.com>
>> To: "A list to discuss home coffee roasting. There are rules for this
>> list,available at http://www.sweetmarias.com/maillistinfo.html" <
>> homeroast at lists.sweetmariascoffee.com>
>> Sent: Monday, April 19, 2010 1:19 PM
>> Subject: Re: [Homeroast] Using CO2 to preserve freshness?
>> Actually, my proposed experiment has little to do with preserving coffee
>>> (though it has the side effect of putting to bed the debate of whether
>>> various storage methods are worth their effort) and more to do with
>>> developing an understanding of what goes on during the rest period. My
>>> yet untested) hypothesis is that oxygen is necessary for some of the
>>> development that goes on during the rest, and that taking steps to
>>> oxygen may delay staling, but also slow the flavor development process
>>> most of us observe during the "rest" period.
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