Topics Topics Help/Instructions Help Edit Profile Profile Member List Register  
Search Last 1 | 3 | 7 Days Search Search Tree View Tree View  

Visit The Brewery's sponsor!
Brews & Views Bulletin Board Service * Brews and Views Archive 2004 * Archive through September 22, 2004 * Starters: Aeration < Previous Next >

  Thread Last Poster Posts Pages Last Post
  ClosedClosed: New threads not accepted on this page        

Author Message
 

Joseph Listan
Member
Username: Poonstab

Post Number: 175
Registered: 03-2003
Posted on Thursday, September 16, 2004 - 05:06 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I believe in oxygenation. I want to provide my starters with maximum aeration via filtered air and airstone. I do not want to use a stir plate.

Now then, it does not take a genius to figure out that foam coming out of the airlock is going to become an issue very quickly. So, how long will foam control agents last when continuously aerating a 1-gallon starter? Is there some mechanical way to kill foam?
 

Bill Pierce
Moderator
Username: Billpierce

Post Number: 584
Registered: 01-2002
Posted on Thursday, September 16, 2004 - 05:22 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Joseph, my considered opinion is that the foam control will last for 48 hours, which should be long enough to do the job in a yeast starter that is continuously aerated.

I can't recall where I saw this, but I seem to remember that continuous agitation was considered more effective than continuous aeration in terms of yeast propagation. If I were to use one of the methods alone I would be inclined to choose a stir plate.
 

George Schmidt
Junior Member
Username: Gschmidt

Post Number: 85
Registered: 08-2004
Posted on Thursday, September 16, 2004 - 07:43 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Ah, yes, Bill. But a stone and aqua pump is much cheaper than a stir plate. (I am considering trying to make one myself out of an old 80mm PC fan inside a cigar box, though.)
 

Craig Johnson
Intermediate Member
Username: Californiacraig

Post Number: 253
Registered: 03-2003
Posted on Thursday, September 16, 2004 - 10:42 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Go to labx.com for you laboratory needs NAYYY. It is like ebay for nerds except the prices are better than ebay.
 

Hophead
Advanced Member
Username: Hophead

Post Number: 980
Registered: 03-2002
Posted on Thursday, September 16, 2004 - 11:25 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Running an air pump continuously in a starter seems like overkill to me... Running it for 10 minutes a few times a day would provide very similar end results IMHO.
 

Mike Mayer
Intermediate Member
Username: Mmayer

Post Number: 301
Registered: 12-2002
Posted on Thursday, September 16, 2004 - 11:41 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

My starters fit inside of a 1 gallon container. All I ever do is shake the crap out of it for about 30 seconds, and I always get a good start, never had a problem. Seems cheaper and easier to deal with than a stir plate or a pump.
 

Kent Fletcher
Advanced Member
Username: Fletch

Post Number: 514
Registered: 11-2002
Posted on Friday, September 17, 2004 - 01:45 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

The best money I ever spent, in return for my brew-buck, was buying a stir plate. I got it for $15 plus about $8 shipping, off eBay. A firend of mine, Maribeth (MB) Raines, PhD (her doctorate is in Microbiology), did a paper on propagation, including oxygenation and stir plate use for yeast starters. You can download it here:
http://www.maltosefalcons.com/tech/MB_Raines_Guid_to_Yeast_Culturing.doc
The difference is 10 to 15 fold over "traditional" starter methods.

(Message edited by fletch on September 17, 2004)
 

George Schmidt
Junior Member
Username: Gschmidt

Post Number: 88
Registered: 08-2004
Posted on Friday, September 17, 2004 - 04:18 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

That is a wonderful article, Kent. That one's getting saved.
 

Colby Enck
Junior Member
Username: Thecheese

Post Number: 46
Registered: 06-2003
Posted on Friday, September 17, 2004 - 11:03 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

"a stone and aqua pump is much cheaper than a stir plate"

...not if it's "procured" from the biotech company that's about to lay you off... ahem.
 

Brandon Dachel
Senior Member
Username: Brandon

Post Number: 1212
Registered: 03-2002
Posted on Friday, September 17, 2004 - 05:56 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

> The best money I ever spent, in return for my

Wow. Thanks for the heads up. I'll be checking ebay out later tonight. That paper was a great read.
 

Kent Fletcher
Advanced Member
Username: Fletch

Post Number: 516
Registered: 11-2002
Posted on Friday, September 17, 2004 - 11:45 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

MB has made a lot of homebrewers "stir crazy." She did a seminar on the subject at the 2001 NHC, I remember the flurry of discussion on the Digest following that. For a couple of months there seemed to be a lot more bidders for stir plates. Some here may remember her culturing kits.

(Message edited by fletch on September 17, 2004)
 

Richard Nye
Member
Username: Yeasty_boy

Post Number: 240
Registered: 01-2004
Posted on Saturday, September 18, 2004 - 01:14 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Kent, great article. I read it front to back and agree with everything MB says. I got a stirrer about a year ago, and I've had good ferments ever since. I think I'll get a hemacytometer and do a little research of my own. Thanks for the info.
 

Sand
Member
Username: Sand

Post Number: 125
Registered: 03-2003
Posted on Tuesday, September 21, 2004 - 01:04 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I have a stir plate for starters, I wonder if the speed of the stir has an effect on the amount of yeast produced.

Sand