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Old 11-05-2009, 10:41 PM   #1
agroff383
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Default Coffee in Beer & Yeast Activity

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 11-05-2009, 11:30 PM   #2
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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

http://en.wikipedia.org/wiki/Caffein...nism_of_action

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Old 11-06-2009, 12:45 AM   #3
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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.

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Old 11-06-2009, 12:48 AM   #4
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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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