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Home Brew Forums > Home Brewing Beer > Recipes/Ingredients > Question about fermentability and attenuation
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Old 01-09-2013, 01:26 PM   #1
borealis
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Default Question about fermentability and attenuation

As I read about going all grain, there is a lot of discussion regarding the fermentability of wort and the fixed fermentability of extract. Then there is also the ability of yeast to attenuate. I just want to make sure I have it all straight. For example if an extract is fixed at 75% fermentability and you get say 77% attenuation, does that mean that of the 75% of the sugars available to be fermented, the yeast successfully got to 77% of those? So if you brewed the same beer as an all grain version and mashed lower and got a more fermentable wort, the same 77% attenuation could actually "eat" more sugar? Thanks for the help.

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Old 01-09-2013, 02:21 PM   #2
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I'll let some of the more senior members chime in too but the way I understand it you are correct.

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Old 01-09-2013, 02:24 PM   #3
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Originally Posted by borealis View Post
So if you brewed the same beer as an all grain version and mashed lower and got a more fermentable wort, the same 77% attenuation could actually "eat" more sugar?
Yes, in that the 'more fermentable' in the case of all grain mash temp variables means the presence of more simple sugars (or fewer complex sugars) as I understand it.
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Old 01-09-2013, 02:25 PM   #4
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Thanks for the replies. It may seem like a simple question, but I just wanted to make sure I was thinking of it correctly.

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