Boiled yeast

  • Thread starter Thread starter gregoryc
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gregoryc

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I've read a number of posts in these forums that mention using boiled yeast in musts for yeast hulls and/or nutrients but I'm wondering what the YAN of a gram of boiled yeast might be. Does anyone know?
 
Roughly the same as goferm then, definitely handy to know. I wonder if commercially available yeast hulls have less YAN because they're suppposedly yeast-guts free.
 
Roughly the same as goferm then, definitely handy to know. I wonder if commercially available yeast hulls have less YAN because they're suppposedly yeast-guts free.

Yes - correct. Commercial yeast hulls have been washed to remove most of the internal cell components, since the usual desire when adding hulls is to use only the cell walls as binding sites for some proteins and other substances that can cause off flavors. Boiled yeast gives you both hulls and a little additional amino nitrogen, courtesy of the included yeast guts.
 
Yeast Assimilable Nitrogen, aka YANC where C is content.

Another common one is FAN for Free Amino Nitrogen, which is not the same as YAN since not all nitrogen can be taken up by yeast.