Yeast Washing Exposed - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Yeast Washing Exposed

Reply
 
Thread Tools
Old 12-28-2012, 06:46 PM   #1
tagz
Recipes 
 
Jan 2008
Posts: 2,063
Liked 275 Times on 193 Posts



This is a post directed at Woodland Brewing Blog... Having trouble posting comments from my iPad. In your Yeast Washing Exposed post you talk about the viability and bacteria content of the layers in a washed yeast jar. Basically you say that the viability of yeast throughout the sediment is equal and that the cell count is pretty high in what people assume is the trub layer. You also say that bacteria levels are the highest in the water layer. You recommend decanting just the water layer, keeping all of the sediment, and adding sanitized water. Would you recommend doing this with older, stored jars? Or would the contamination risk out weigh the benefit? Others can feel free to add their thoughts. Great blog by the way.

 
Reply With Quote
Old 01-08-2013, 02:29 PM   #2
WoodlandBrew
HBT_SUPPORTER.png
 
WoodlandBrew's Avatar
Recipes 
 
Oct 2012
Malden, MA
Posts: 2,191
Liked 244 Times on 199 Posts


Here is the original post:
http://woodlandbrew.blogspot.com/201...g-exposed.html

And this is a more recent post revisiting the issue:
http://woodlandbrew.blogspot.com/201...revisited.html

Quote:
Originally Posted by tagz View Post
This is a post directed at Woodland Brewing Blog... Having trouble posting comments from my iPad. In your Yeast Washing Exposed post you talk about the viability and bacteria content of the layers in a washed yeast jar. Basically you say that the viability of yeast throughout the sediment is equal and that the cell count is pretty high in what people assume is the true layer. You also say that bacteria levels are the highest in the water layer. You recommend decanting just the water layer, keeping all of the sediment, and adding sanitized water. Would you recommend doing this with older, stored jars? Or would the contamination risk out weigh the benefit? Others can feel free to add their thoughts. Great blog by the way.
Thanks!

What you wrote is a good summary of what I have seen.

There are some benefits to storing in beer compared to water such as lower pH, and higher alcohol. So it really depends on how clean the stored slurry is. For most people I would wager a guess that it would be beneficial to decant and replace with water. The only place I have seen extremely low bacteria counts is in tap water and professionally packaged yeast. Even high quality beer can have an alarming amount of bacteria in the yeast slurry at the bottom of a bottle. Bacteria has a way of work of it's way into beer regardless of how careful you might be. It's keeping that bacteria minimized that is crucial to making great beer.
__________________
The 2nd edition is now available: Brewing Engineering
Woodland Brewing Research Blog Applied Science for Better Beer.

 
Reply With Quote
Old 01-13-2013, 03:22 AM   #3
tagz
Recipes 
 
Jan 2008
Posts: 2,063
Liked 275 Times on 193 Posts


Does trub have any impact on future performance or long term storage? I just washed some 1968 and foused my energy decanting the liquid layer rather than separating the trub. As a result I have a much larger quantity of solids (and presumably yeast) than I normally do. It is much less clean though. Is there any drawback to letting yeast sit mixed with trub over the long term?

 
Reply With Quote
Old 01-13-2013, 03:24 AM   #4
eastoak
Recipes 
 
Jan 2011
oakland, california
Posts: 3,292
Liked 159 Times on 149 Posts


Quote:
Originally Posted by tagz View Post
Does trub have any impact on future performance or long term storage? I just washed some 1968 and foused my energy decanting the liquid layer rather than separating the trub. As a result I have a much larger quantity of solids (and presumably yeast) than I normally do. It is much less clean though. Is there any drawback to letting yeast sit mixed with trub over the long term?
not that i've noticed. most breweries that pull yeast out of the cone for repitching do not wash it at all, just dump it in.

 
Reply With Quote
Old 01-13-2013, 03:33 PM   #5
fiat84
Recipes 
 
Nov 2009
Edmonton
Posts: 30
Liked 3 Times on 3 Posts


Great blog, very educational.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Exposed wort! ed5388 Beginners Beer Brewing Forum 4 09-09-2012 03:18 PM
Yeast Washing FAIL: Read the above thread after washing. StinkyVp Fermentation & Yeast 14 05-06-2012 02:28 PM
Secondary exposed to air. Buckeye_Brewer1 General Beer Discussion 4 04-01-2012 02:28 AM
Will exposed JB weld cause problems in the HLT? bmckee56 Kettles, Mash Tuns & Hot Liquor Tanks 12 09-11-2010 03:09 PM
ale exposed for a while -- how much worry required? FSBrewer Beginners Beer Brewing Forum 7 07-22-2008 01:28 PM


Forum Jump