Keg Connection New Inline Flow Control Valve Giveaway

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > White Labs vial past "Best By" date...
Thread Tools
Old 05-21-2012, 08:00 PM   #1
Feedback Score: 0 reviews
Join Date: Aug 2010
Location: Columbus, GA
Posts: 145
Liked 19 Times on 12 Posts
Likes Given: 3

Default White Labs vial past "Best By" date...

I'm planning to brew a Belgian Pale Ale this weekend (OG 1.052), and the vial of WLP575 that was sent to me with my order is past it's "best by" date by about 10 days. I called the shop that sent it to me, and it was the last one they had. I was assured that the yeast had been kept refrigerated as long as it was at the shop and it went into my fridge as soon as it was delivered.

According to the Mr. Malty yeast calculator, this yeast has only about 10% of it's original viability. I do a starter with all my batches, but should I do a two-stage starter with this since it's likely to be pretty weak? For a beer this strength, I would normally do a 1L starter with a gram or so of Wyeast nutrient at about 1.040, let it grow for 36 hours or so, pop it in the fridge the night before the brew and decant the spent wort before pitching. I was thinking this time I might grow it once in a lower strength starter (maybe 1.030 or so), refrigerate, decant and pour fresh 1.040 wort on top and give it another day or so of fermentation to get my viability back up before pitching into the beer on brew day.

Is this overkill? Should I just go with my normal starter procedure and pitch as usual? I'm sure someone here has used a vial past it's "best by" date; how much is viability really affected?

Thanks for any input, I appreciate it.

stjackson is offline
Reply With Quote
Old 05-21-2012, 08:03 PM   #2
Feedback Score: 0 reviews
Join Date: Sep 2007
Location: Corpus, Texas
Posts: 1,574
Liked 17 Times on 16 Posts
Likes Given: 55


many times have i used yeast that was past the date, I just make a starter and all seems to work out.

In Illa Brettanomyces Nos Fides
hopsalot is offline
Reply With Quote
Old 05-21-2012, 08:40 PM   #3
Feedback Score: 0 reviews
Join Date: Feb 2010
Location: KCMO
Posts: 1,502
Liked 139 Times on 105 Posts
Likes Given: 24


Normal starter is fine.
BJCP Master Beer Judge
AmandaK is offline
Reply With Quote
Old 05-21-2012, 08:51 PM   #4
Feedback Score: 0 reviews
Join Date: Apr 2011
Location: louisville, KY
Posts: 287
Liked 32 Times on 18 Posts
Likes Given: 2


You should do the step up. Even refridgerated, at 4 months you've lost a lot of cells.

Or just figure that a single liter will be fine and that it will work out.
pohldogg is offline
Reply With Quote
Old 05-21-2012, 10:15 PM   #5
Feedback Score: 0 reviews
LLBeanJ's Avatar
Join Date: Feb 2012
Location: Windsor, CO
Posts: 2,333
Liked 479 Times on 358 Posts
Likes Given: 183


Assuming a 5 gal batch, according to yeastcalc you need about 182 billion cells. Using a 1/11/12 viability date, with a normal 1.0L starter and a stir plate, you'd only be at 65 billion. That's some serious underpitching.

Do a .75L initial step, then follow up with a 1.2L second step. That'll put you right around 184 billion cells.

LLBeanJ is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to find the "Born On" date of White Labs Yeast? RonRock Fermentation & Yeast 14 09-01-2015 01:18 PM
White Labs vial explosions ziggy13 Fermentation & Yeast 19 06-25-2013 01:28 AM
Pitching past White Labs 'best buy' date. jiggs_casey Fermentation & Yeast 10 11-02-2012 03:58 PM
fizzy white labs vial mk78 Fermentation & Yeast 4 07-31-2010 08:43 PM
Volume of White Labs vial? psuchunk03 Fermentation & Yeast 1 07-07-2010 02:31 PM

Forum Jump

Newest Threads