Homebrewers Association | AHA Forum

General Category => Yeast and Fermentation => Topic started by: beerrat on March 29, 2010, 10:15:30 am

Title: Can old yeast be used as a nutrient?
Post by: beerrat on March 29, 2010, 10:15:30 am
I have not been able to find the source of where I read/heard this, but can old yeast be boiled (or added to the wort boil) and used as a yeast nutrient?
Something to do with those old packs of munton's that came with the beer kit.  ;D
If so, would same hold true for a yeast slurry from a prior batch?
Title: Re: Can old yeast be used as a nutrient?
Post by: denny on March 29, 2010, 11:00:37 am
Maybe....as I understand it, the nutrient value comes from zinc stored in the yeast.  There will only be a lot of zinc in there if the previous fermentation was healthy and built up a reserve.
Title: Re: Can old yeast be used as a nutrient?
Post by: blatz on March 29, 2010, 11:08:19 am
IIRC, The Professor says he always adds some of the previous slurry to the boil on a new batch for that very reason.
Title: Re: Can old yeast be used as a nutrient?
Post by: denny on March 29, 2010, 11:09:49 am
IIRC, The Professor says he always adds some of the previous slurry to the boil on a new batch for that very reason.

But I don't think he or anyone I'm aware of has actually done a comparison to see what is actually happening.