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ChadY
06/15/10 12:36 AM  
Brett fermentations, w/yeast nutrient or w/out?
Any of you brewers doing 100% Brettanomyces fermentations adding a yeast nutrient to your fermentations?

If so, why and what have been the effects?

Chad

Mike T
06/15/10 08:25 AM  
Re: Brett fermentations, w/yeast nutrient or w/out
I used White Labs Servomyces on a couple, I think that was a Tomme reccomendation. I didn't notice a huge difference between ones where used it and others that I just used Wyeast Nutirent. I use yeast nutrient in all my beers, seems to help get a healthier ferementation and is cheap insurance at a few cents a batch.
sl8w
06/15/10 10:23 AM  
Re: Brett fermentations, w/yeast nutrient or w/out
Yes. I've added it on batches built up from a starter, and batches where I've pitched slurry. Can't answer the "why" question ... like Mike, its something I always do, when I remember. I repitched one strain about 6 times, and another about 3. I forgot nutrient on a few batches, but I'm not sure if I noticed any difference in those batches. Over time, the brett got sluggish and dusty, but I don't know whether, or to what extent, the use/non-use of yeast nutrient played any role in that.
JeffB
06/15/10 10:24 AM  
Re: Brett fermentations, w/yeast nutrient or w/out
I didn't use nutrients and didn't make a starter and my beer was amazing, I think stressing the yeast may have created better flavors and aromas. I decided to do it this way after talking to Sean Paxton the Homebrew Chef about his 100% Brett Pale he did a few years ago, "Sonoma Pale Ale". I will hopefully be making batch 2 of mine soon and I won't use nutrients or a starter again. It did take about 3 days for visible signs of fermentation.
brewinhard
06/15/10 05:01 PM  
Re: Brett fermentations, w/yeast nutrient or w/out
I too used nutrients (just plain ol DAP crystals) in my starters with the brett, plus some in the boil for my wort used for the brett. Always saw typical fermentations, and just guessed that I used it as a reassurance sort of thing. Beers came out tasty, so I didn't complain.
ChadY
06/17/10 12:03 PM  
Re: Brett fermentations, w/yeast nutrient or w/out
Sounds like an argument for the use of yeast nutrient would be hard to make off the experiences some have had.

Brettanomyces lacks the ability to produce biotin and thiamine, so the ability to complete fermentation without the important TPP co-factor seems odd. Using yeast nutrients would add key nutrients and should help with complete fermentations and a shortening of the fermentation time while giving a healthier overall fermentation when using pure cultures of Brettanomyces strains.

JWW
06/17/10 01:22 PM  
Re: Brett fermentations, w/yeast nutrient or w/out
I am going to make the assumption that most of the Brett strains we use are closer to wild origin rather than lab origin. With that in mind, it would make sense that the Brett strains we use would be use to a scavaging lifestyle and have a way around low concentrations of biotin and thiamine.

I have grown Brett on both Malt extract and YPD medium side by side and have always noticed better, quicker growth on YPD medium. Its partly the reason I always use YPD to culture Brett and Sacc strains for a starter, but I have not yet supplied additional nutrients to the primary fermentation.

 
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