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Old 11-05-2009, 11:41 PM   #1
agroff383's Avatar
Mar 2009
Lancaster PA
Posts: 537
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If I add cold coffee extract to a beer will the caffiene in the beer affect the yeast like it affects us? I am making a coffee porter with European Ale White labs yeast in a starter, with Starbucks Sumatran coffee that I am currently cold steeping.
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Old 11-06-2009, 12:30 AM   #2
Sep 2007
Quebec City, Canada
Posts: 112

I don't think so, yeast would need a brain to process caffeine, and made of only one cell, I hardly call that a brain, except for a few people
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Old 11-06-2009, 01:45 AM   #3
May 2009
Edmond, OK, Oklahoma
Posts: 224
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I just did the same thing to a Porter. I bottled it today. It tasted pretty good! Nice robust taste with a lingering hint of coffee on the back end.
"Offered a Bud Light, and a glass of water - I'd drink the water. You only have one liver, don't waste it on bad beer." - Brock Wagner

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Old 11-06-2009, 01:48 AM   #4
Edcculus's Avatar
Jun 2007
Greenville, SC
Posts: 4,546
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Add the coffee when you bottle. Thats the best way to preserve the coffee flavor and not affect the yeast. I know caffine is a poison to most small critters. Thats why plants produce it. I'm not specifically sure if its a poison to yeast though.

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