Author Topic: Lager yeast starter smells like diacetyl  (Read 810 times)

Offline troybinso

  • Brewer
  • ****
  • Posts: 440
    • View Profile
Lager yeast starter smells like diacetyl
« on: March 12, 2014, 04:13:28 PM »
I made two separate starters of wyeast 2278 Bohemian Lager and they both smell strongly of diacetyl. The starters were kept at about 68 degrees. I just brewed the batch and will be ready to pitch the yeast in a few hours. I am not that familiar with lager brewing. Is it ok to use this yeast?

Offline hopfenundmalz

  • I must live here
  • **********
  • Posts: 7702
  • Milford, MI
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #1 on: March 12, 2014, 04:17:39 PM »
IIRC that one is a good diacetyl producer. You need to pitch a lot of it a little below fermentation temp, manage the temps during fermentation, and do a diacetyl rest or a long lagering time. The yeast will reasorb the diacetyl when they are done fermenting given time. With a starter you have not given them time to reabsorb. I also recommend yeast nutrient in the end of the boil.
Jeff Rankert
Ann Arbor Brewers Guild
AHA Governing Committee
BJCP National
Home-brewing, not just a hobby, it is a lifestyle!

Offline majorvices

  • Global Moderator
  • I must live here
  • *****
  • Posts: 8827
  • Polka. If its too loud you're too young.
    • View Profile
    • Yellowhammer Brewing Company
Re: Lager yeast starter smells like diacetyl
« Reply #2 on: March 12, 2014, 07:39:20 PM »
I've never worried too much about how a well handled yeast starter smells. If it is healthy and not made with questionable sanitation practices it will treat you right. Just follow proper fermentation protocol.

Offline ynotbrusum

  • Brewmaster General
  • *******
  • Posts: 2260
  • Da mihi sis cerevisiam.
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #3 on: March 12, 2014, 09:01:21 PM »
Agreed - you are making yeast - not beer, so you want healthy yeast as the end result.  I don't think the same rules apply as to  making beer.  I will post one caveat - my palate is weak as to diacetyl and DMS.  Others may say that they can perceive either aspect where I just don't.
Hodge Garage Brewing: "Brew with a glad heart!"

S. cerevisiae

  • Guest
Re: Lager yeast starter smells like diacetyl
« Reply #4 on: March 15, 2014, 02:52:33 PM »
IIRC that one is a good diacetyl producer.

+1

It's the nature of the beast.  Saaz-type strains are diacetyl producers.  However, the malt profile that they produce is worth the extra effort necessary to control/reduce diacetyl.

Offline thirsty

  • Brewer
  • ****
  • Posts: 304
  • Brewster, NY
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #5 on: March 16, 2014, 11:41:51 AM »
Yeah, starters frequently smell kind of weird in my experience. But the beer always tastes good.

Offline klickitat jim

  • Official Poobah of No Life.
  • *
  • Posts: 7042
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #6 on: March 16, 2014, 12:35:07 PM »
I've not heard of saaz yeast.

Offline Pinski

  • Senior Brewmaster
  • ******
  • Posts: 1944
  • Portland, Oregon
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #7 on: March 16, 2014, 12:47:47 PM »
I've not heard of saaz yeast.

It's a geography thing. Saaz is the German name for the Czech town of Zatec. In this case I believe referring more regionally to Czech/Bohemian origin yeast strains.
Steve Carper
Green Dragon Brew Crew
Clubs: Oregon Brew Crew & Strange Brew
BJCP Certified

Offline klickitat jim

  • Official Poobah of No Life.
  • *
  • Posts: 7042
    • View Profile
Re: Lager yeast starter smells like diacetyl
« Reply #8 on: March 17, 2014, 01:12:37 AM »
I figured, but just hadn't heard it. Maybe it's a term used in that area? Or was used before my time, who knows.