Yeast shelf life - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Yeast shelf life

Reply
 
Thread Tools
Old 11-24-2012, 05:55 PM   #1
Bevilaquafoto
Recipes 
 
Feb 2012
New York, New York
Posts: 42
Liked 1 Times on 1 Posts



I bought a packet of dry Nottingham ale yeast before hurricane Sandy hit here in Hoboken, NJ. I put it in my fridge hoping to use it within the next few days. The hurricane hit, we lost power and the fridge went warm. The yeast stayed dry (unlike my kitchen, bathroom and bedroom), and then cooled again when the power came back on. Did I lose my yeast? Did the cooling, warming and cooling kill it, or should it still be good in the vacuum sealed packet? Any thoughts would be appreciated.

Thank you
__________________
Lorenzo Bevilaqua
Lorenzo Bevilaqua Photography
http://www.lorenzobevilaqua.com

Leave the gun. Take the cannolis.

 
Reply With Quote
Old 11-24-2012, 06:02 PM   #2
passedpawn
Waste Allocation Load Lifter - Earth Class
HBT_ADMIN.png
 
passedpawn's Avatar
Recipes 
 
Apr 2009
☼ Clearwater, FL ☼
Posts: 26,540
Liked 7017 Times on 4154 Posts


Yeast is fine.

Response from Dr. Clayton Cone [Lalvin]:
Active Dry Yeast, at <5% moisture, is originally packaged in an oxygen free atmosphere either via nitrogen flush or vacuum. Under these conditions they will loose about 20% activity / year when stored at 20C.(68F) and about 5% activity / year when stored at 4C.(40F). It is the presence of Oxygen and the pick up of small amounts of moisture that causes the yeast to deteriorate at a faster rate, once the package has been opened. If you can vacuum pack (kitchen vacuum package equipment)or store in an air tight container and refrigerate you may retain a substantial amount of the activity. It would be wise to increase the inoculum 50% to be on the safe side. It is always a gamble, depending on how much moisture the cells have picked up each time you open and close the package and return to the refrigerator.
__________________
- Andrew

 
Reply With Quote
Old 11-24-2012, 06:05 PM   #3
Bevilaquafoto
Recipes 
 
Feb 2012
New York, New York
Posts: 42
Liked 1 Times on 1 Posts


Thank you so much! That's great to know.
__________________
Lorenzo Bevilaqua
Lorenzo Bevilaqua Photography
http://www.lorenzobevilaqua.com

Leave the gun. Take the cannolis.

 
Reply With Quote
Old 11-25-2012, 09:53 AM   #4
daksin
HBT_SUPPORTER.png
 
daksin's Avatar
Recipes 
 
Aug 2011
San Diego, CA
Posts: 4,617
Liked 357 Times on 311 Posts


Yea, you're good to go, no worries!
__________________
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!

twitter.com/2kidsbrewing .. facebook.com/2kidsbrewing .. 2kidsbrewing.com

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yeast shelf life dukes7779 Fermentation & Yeast 10 02-19-2012 07:16 PM
Shelf life of Yeast martink49 Beginners Beer Brewing Forum 7 10-12-2010 12:17 PM
Yeast Shelf Life Cold_Steel Fermentation & Yeast 3 02-17-2010 05:57 PM
Yeast shelf life ChuckCollins Extract Brewing 5 07-29-2009 03:42 PM
Shelf life of yeast Brewno Beginners Beer Brewing Forum 5 06-14-2006 11:28 AM


Forum Jump