Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > O2 In Wort
Reply
 
Thread Tools
Old 03-02-2009, 06:39 PM   #1
batfishdog37
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Menomonie, Wisconsin, Wisconsin!!
Posts: 196
Liked 1 Times on 1 Posts

Default O2 In Wort

I understand that aeration is a key component to fermentation. Higher aeration promotes the aerobic phase of the yeast. But, how much aeration is proper? As much as possible? Or is a vigorous pour into the fementer adequate?


batfishdog37 is offline
 
Reply With Quote
Old 03-02-2009, 06:41 PM   #2
Tonedef131
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Fort Wayne
Posts: 1,906
Liked 26 Times on 14 Posts
Likes Given: 3

Default

Depends on the OG and what type of yeast strain. I would say most of the time you will want to do more than a vigorous pour, shaking for 5 min seems to be the standard for those who don't use pure O2.


Tonedef131 is offline
 
Reply With Quote
Old 03-02-2009, 06:51 PM   #3
batfishdog37
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Menomonie, Wisconsin, Wisconsin!!
Posts: 196
Liked 1 Times on 1 Posts

Default

Cool thanks. Also, poor aeration can lead to lower than desired OG, correct?
batfishdog37 is offline
 
Reply With Quote
Old 03-02-2009, 06:56 PM   #4
Tonedef131
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Fort Wayne
Posts: 1,906
Liked 26 Times on 14 Posts
Likes Given: 3

Default

No, your OG would already be determined by the time the wort is in the fermenter. Poor aeration can only lead to poor yeast health and likely a lower cell count. This can in turn cause off flavors and perhaps higher than desired FG.
Tonedef131 is offline
 
Reply With Quote
Old 03-02-2009, 07:04 PM   #5
batfishdog37
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Menomonie, Wisconsin, Wisconsin!!
Posts: 196
Liked 1 Times on 1 Posts

Default

Er......yeah that's what I meant, FG not OG. Is that because the yeast would not consume all of the possible sugars? Or do yeast get "full" or something?
batfishdog37 is offline
 
Reply With Quote
Old 03-02-2009, 07:07 PM   #6
Tonedef131
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2008
Location: Fort Wayne
Posts: 1,906
Liked 26 Times on 14 Posts
Likes Given: 3

Default

Well there is a lower cell count to consume the same amount of sugar. So you are basically asking the yeast to do more with less...which doesn't work, you get less with less.
Tonedef131 is offline
 
Reply With Quote
Old 03-02-2009, 07:11 PM   #7
batfishdog37
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Menomonie, Wisconsin, Wisconsin!!
Posts: 196
Liked 1 Times on 1 Posts

Default

Got it, thanks a lot Tonedef, I appreciate it.
batfishdog37 is offline
 
Reply With Quote
Old 03-02-2009, 07:17 PM   #8
Edcculus
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2007
Location: Greenville, SC
Posts: 4,567
Liked 43 Times on 40 Posts

Default

Oxygen is important for yeast to be able to develop their cell wall properly. A weak cell wall means a few things. First, cell wall permeability is increased. This isn't a huge issue in a beer around 1.040-1.050. Any higher and the sugary water can possibly suck all the water out of the cell.

The second is that a yeast cell cannot properly bud. Yeast reproduce by budding. If the cell wall is thin and brittle, it cannot reproduce well.


Edcculus is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chilling wort without wort chiller. Moun10 General Techniques 47 10-01-2014 07:42 AM
How to Cool Wort (w/out wort chiller) web250 Beginners Beer Brewing Forum 42 09-30-2011 08:58 PM
converting outdoor wort chiller to indoor wort chiller Pauliwankenobi Beginners Beer Brewing Forum 3 12-30-2008 11:37 AM
all grain wort ferments faster than extract wort? dcunitedfan All Grain & Partial Mash Brewing 8 05-08-2008 12:46 PM
wort chiller and water/wort transfer questions chemist308 Equipment/Sanitation 1 03-24-2008 01:33 AM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS