Did I kill my yeast?? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Did I kill my yeast??

Thread Tools
Old 11-06-2009, 02:58 AM   #1
Aug 2009
Posts: 25
Liked 1 Times on 1 Posts

Simple 5 gal extract brew with speciatly grains, English Light Ale. Starting gravity 1.042. Pitched around 74 F and had normal activity for 24 hours, but temp in fermenter was not coming down despite being in ~70 F ambient. I let the room temp fall back to ~64 F over night and the next morning my fermenter was down to ~66-67. It remained there for a week with little activity... racked to secondary at 1.018. Brew was quite cloudy at racking and smelled very... green? or strong at racking. It's been in the secondary almost a week at a constant 68 F, I haven't seen the airlock even change position, like nothing has occured. Got a good seal, its in a carboy with stopper... push on the stopper i can make the water move in the lock.

Did I somehow stop the yeast with too fast of a temperature change... or is there still some activity ongoing despite seeing no signs? Going to give it another week and take a reading I guess, would expect ~1.010 FG.

Reply With Quote
Old 11-06-2009, 03:23 AM   #2
Aug 2009
Posts: 1,630
Liked 29 Times on 23 Posts

You can't have a FG different from your OG with dead yeast.


Reply With Quote
Old 11-06-2009, 03:26 AM   #3
May 2009
Princeton, NJ
Posts: 52

You didn't kill your yeast, but dropping the temp quickly by even a few degrees can cause your yeast to deactivate and flocculate out. Give the carboy a swirl to bring any settled out yeast back up into suspension - that can sometimes get them restarted. Wouldn't hurt to warm it back up by a couple degrees and give it a little more time. But I've had extract+specialty grain beers finish at 1.020 before, so it might actually be finished...
Random Fact: Human Immunodeficiency Virus particles have approximately the same density of 1.170 wort. I know because I float them on a sucrose gradient in the lab to purify them for research.

Primary: nada

Drinking: Belgian strong golden, Northern Brown, Porter

Reply With Quote
Old 11-06-2009, 03:26 PM   #4
malkore's Avatar
Jun 2007
Posts: 6,922
Liked 37 Times on 35 Posts

If you weren't at final gravity expected...why did you rack? Time doesn't dictate racking or bottling. The beer being DONE according to a steady gravity at or very close to the expected gravity is what dictates when we do things.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Did I kill my yeast? CaptYesterday Fermentation & Yeast 4 09-08-2009 08:49 PM
did i kill my yeast? xbabyboy4021x Beginners Beer Brewing Forum 7 12-01-2008 02:57 AM
Need to kill my yeast Hoowil Cider Forum 4 06-24-2008 01:51 PM
Will I kill my yeast? BrewBrain Recipes/Ingredients 2 06-22-2008 04:05 AM
Did i kill my yeast? tdavisii General Techniques 5 01-26-2007 09:59 PM

Forum Jump