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Old 11-01-2012, 04:17 PM   #1
Frige
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Default Esters in my ale

I recently brewed a cream ale partial mash from midwest. It came with safale us-05 yeast. I really do like it and it has a hint of hops not to hoppy like a ipa. As I am drinking it out of a glass I noticed a slight fruity smell. After a bit of research it seems to be ethyl butyrate. Its not really too bad but I bet the beer would be better without it. Do I need to ferment at a lower temp? I have a cooler and have it at 69 degrees for ales.



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Old 11-01-2012, 04:31 PM   #2
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That is a bit high, but do you have the cooler temp at 69 or was the beer temp 69? I believe that yeast does best under 70 degrees. I use white labs and keep my ales at 68 degrees.



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Old 11-01-2012, 04:37 PM   #3
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S05 gets fruity above 70F. There’s a lot of heat given off in the early stages of fermentation, so you were probably fermenting in the high 70's. You should probably start at 62 and let it come up slowly as the fermentation slows, finishing at 70.

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Old 11-01-2012, 04:38 PM   #4
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US-05 should be clean up to around 72F. It's a clean yeast in that it usually doesn't produce fruity esters like other ale yeasts.
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Old 11-01-2012, 04:42 PM   #5
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Esters are mostly produced at higher fermentation temperatures. This particular yeast has a range of 59-75 degrees, with a low ester profile. Therefore, I would recommend turning your cooler down to about 66-67 degrees since yeast tend to warm up the fermentor slightly during primary fermentation. Hopefully, this will keep you in the 68 degree range inside the fermenter and lower the presence of ester profiles.

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Old 11-01-2012, 04:47 PM   #6
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Is it a hop fruity smell, like citrus/pineapple/grapefruit? What hops were used and what was the fermentation temp?

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Old 11-01-2012, 04:48 PM   #7
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Quote:
Originally Posted by RainyDay
Is it a hop fruity smell, like citrus/pineapple/grapefruit? What hops were used and what was the fermentation temp?
Whoops, just saw that it was 69 degrees, which shouldnt cause off flavors. Im guessing you're reading too much into it and actually have a beer with goos hop flavor! Unless its green apple, then its another issue.
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Old 11-01-2012, 05:10 PM   #8
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A couple other things you can do to reduce esters are increase the yeast pitching rate, and increase the oxygenation level with pure oxygen.

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Old 11-01-2012, 10:47 PM   #9
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Ice bath it...Don't do 70's or you'll get a big league chew bubble gum flavor. Also be sure to research your water and make fine adjustments to accentuate the hops.

Yeast behavior is aerobic so it will bounce around and raise the temperatures. Don't be so sure your temp strip is accurate. 05 is really best at 58-60

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Old 11-01-2012, 11:42 PM   #10
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I'd agree with old world, especially since you want a cream ale to be clean. Have the ambient temperature in the cooler more like 60-65 and you should get a much cleaner fermentation. Also, I would put a thermometer in a glass of water in the cooler to double check, I know my Johnson Controller is about 4 degrees off, so setting it at 69 would get about 73 ambient which could have been at least 75 inside your carboy.



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