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General Category => Yeast and Fermentation => Topic started by: rbowers on July 18, 2015, 10:59:30 PM

Title: Lacto Souring
Post by: rbowers on July 18, 2015, 10:59:30 PM
Planning on brewing a Berliner Weisse and souring using lactobacillus brevis.  I wanted to try kettle souring (well actually "fermentor souring"), tossing a starter of pure lacto into the wort for a few days until appropriate sourness obtained.  It sounds like getting a really oxygen deplete environment is best for this part and I contemplated doing this in a CO2 purged corny keg.  My question is: should I expect significant CO2 buildup?  Will it be enough to simply burp the keg every 12 hrs or so?  From my research is sounds like L. Brevis can be heterofermentative and produce both alcohol and CO2, just not sure how much.
 Benefits to doing this in the keg would be easy sampling (just put a picnic tap on keg) to hit the sourness just right.  I'm not looking to make some co2 bomb in the garage though.  Any thoughts?
Also is there any benefit to boiling after the lacto is done to sterilize wort?  I don't mind some continued acidification/souring of the wort to go along with the primary sach fermentation.  Can't think of any other reason to do this step.
Title: Re: Lacto Souring
Post by: klickitat jim on July 18, 2015, 11:13:23 PM
Two reasons to boil after souring. Stop the souring and to isomerize hops.
Title: Re: Lacto Souring
Post by: kramerog on July 18, 2015, 11:45:31 PM
I think anaerobic conditions initially are not essential but that may vary based on the specific strain.  Any reason why you just don't do the fermentation in a plastic bucket?

I think boiling the soured wort to be a waste.
Title: Re: Lacto Souring
Post by: rbowers on July 19, 2015, 12:28:45 AM
Actually don't have a bucket lying around that isn't scratched beyond recognition or been utilized for something else other than brewing.  Went with the kegs just because I have several empty ones lying around and it makes transfers with CO2 real easy on the low back (which isn't to strong these days).