+- +-

+-User

Welcome, Guest.
Please login or register.
 
 
 
Forgot your password?

+-Gallery

Shoutbox

newf84 says: Cheers everyone!!
combat32 says: I like it!!  Just Brew It!
Brew Beerymore says: We all know Nike has the slogan: Just Do It!,

How about the 17crew have the slogan: Just Brew It!

?
M0nk3y says: Happy New Year  ;)
combat32 says: Merry Christmas!!
combat32 says: Happy Thanksgiving
combat32 says: just realized i brewed my 75th batch of homebrew  :D
combat32 says: Happy Halloween
combat32 says: i got stuck in mine once...had to drink my way out 8)
Brew Beerymore says: I was hiding in my kegerator, combat. Sorry about that.

+-Top Posters

combat32
Posts: 3935
vic
Posts: 3652
DamoNinja
Posts: 2865
CorronZenith
Posts: 2766
Greedy Dragon Brewing
Posts: 2496

Author Topic: Hot Side Aeration  (Read 4643 times)

arrogantbastardale

  • Master Brewer
  • Hero Member

  • Offline
  • *****

  • 605
    • My YouTube Channel
Hot Side Aeration
« on: September 20, 2012, 08:20:38 PM »
One of the most prevalent myths of homebrewing is Hot Side Aeration.  HSA is the effect of O2 oxidizing your wort at hot temperatures, and is caused by agitating the hot wort.  The more agitation and splashing, the more HSA will supposedly occur.  HSA off flavors include musty, cardboard, or paper aromas/flavors.  It is traditionally thought that the time period between the end of the boil and when chilled is when HSA can occur (I am not sure at which temperature the classic literature says that HSA is no longer an issue, but one old Zymurgy article says 86 degrees F!).  There have also been claims that too much agitation of the mash can cause HSA, although most information these days says that the boil will reverse any HSA in the mash.  From what I understand, beer oxidizes naturally, but at higher temperatures it oxidizes much easier due to the increase in energy (heat = energy).  That is why we store our beer long term in the fridge.

Introducing Dr. Charlie Bamforth, one of the leading brew scientists at UC Davis.  He has done a lot of research on behalf of Anheuser-Busch, including research on HSA.  He says that HSA, while not a complete myth, is something that professional brewers and especially homebrewers shouldn't worry about.  First of all the small scale at which homebrewers brew produces such a smaller amount of splashing in comparison to prouction breweries.  In addition with a healthy fermentation the yeast will clean up any effects of HSA. 

For more details, check out this interview with Dr. Bamforth.  It is one of the best episodes of the Brew Strong podcast: http://www.thebrewingnetwork.com/membersarchive/bs_hsa1-26-09.mp3
« Last Edit: September 20, 2012, 08:24:30 PM by arrogantbastardale »

Tony_G

  • Superhero Member

  • Offline
  • *****

  • 1015
    • tony_g_1319
Re: Hot Side Aeration
« Reply #1 on: September 21, 2012, 11:24:56 AM »
I guess oxidation, like any other chemical reaction, will happen faster at higher temps. I would think that while the wort is boiling, you're actually driving off disolved gasses so it make sense that the time to avoid excessive agitation would be when the wort is still hot but below the boiling point. The thing is, in normal homebrew process you're not spending much time in that temp. zone. I don't see a lot of agitating happening in the danger zone but it could be a reason to be careful until the wort cools. Anyway, it would be fairly easy to test this. Just pull a gallon of fresh hot wort, oxidize the heck out of with an airstone and O2 and then ferment under the same conditions as the main batch. If the test batch comes through that with no off flavors then I think it would be safe to put this one to bed. I'm hoping it tastes better and everyone goes "huh?"


arrogantbastardale

  • Master Brewer
  • Hero Member

  • Offline
  • *****

  • 605
    • My YouTube Channel
Re: Hot Side Aeration
« Reply #2 on: September 21, 2012, 02:12:43 PM »
I guess oxidation, like any other chemical reaction, will happen faster at higher temps. I would think that while the wort is boiling, you're actually driving off disolved gasses so it make sense that the time to avoid excessive agitation would be when the wort is still hot but below the boiling point. The thing is, in normal homebrew process you're not spending much time in that temp. zone. I don't see a lot of agitating happening in the danger zone but it could be a reason to be careful until the wort cools. Anyway, it would be fairly easy to test this. Just pull a gallon of fresh hot wort, oxidize the heck out of with an airstone and O2 and then ferment under the same conditions as the main batch. If the test batch comes through that with no off flavors then I think it would be safe to put this one to bed. I'm hoping it tastes better and everyone goes "huh?"


BasicBrewing Radio did this exact thing with a whisk a few years prior to the Bamforth interview. They had some very interesting results! :)

http://ec.libsyn.com/p/0/d/5/0d5c47b44b7088b2/bbr11-02-06.mp3?d13a76d516d9dec20c3d276ce028ed5089ab1ce3dae902ea1d01cc8f35d4c95e3cc1&c_id=1452080

Mainiac

  • Sr. Member

  • Offline
  • ****

  • 311
  • Personal Text
    Did you hear something?
Re: Hot Side Aeration
« Reply #3 on: September 21, 2012, 07:39:50 PM »
Bravo.  this is a great start

Tony_G

  • Superhero Member

  • Offline
  • *****

  • 1015
    • tony_g_1319
Re: Hot Side Aeration
« Reply #4 on: September 21, 2012, 11:09:31 PM »
Very interesting recording in that now we know what not to do as far as an experiment goes. I found it pretty informative that some brewers are adding a Campdem tablet or other anti-oxidants to the mash, that adds some weight to the idea that it's the 100F to 130F temp range where the O2 binding enzyme becomes active.

rychannel

  • Newbie

  • Offline
  • *

  • 7
Re: Hot Side Aeration
« Reply #5 on: February 10, 2015, 09:57:25 PM »
I've wondered about this since I tend to rinse out my LME plastic cans which usually requires a lot of shaking.


Thanks for clearing it up ABA!

strat

  • Superhero Member

  • Offline
  • *****

  • 1086
    • https://www.youtube.com/channel/UCV5rdR-gd5x4NAVLxnFyxCw/feed
Re: Hot Side Aeration
« Reply #6 on: May 11, 2015, 11:20:44 PM »
Very good link to John Palmers Aeration talk.
Cheers Dan

 

Recent Topics

Clean Slate Saison - International collaboration series by Brew Beerymore
Today at 10:52:14 AM

What did you just pour? New Thread by ryan88dozer
Today at 10:11:39 AM

Question about stabilizing my Mead by Brew Beerymore
Today at 09:44:44 AM

BB is back on YouTube! by Brew Beerymore
Today at 09:38:25 AM

Expired Hops by combat32
Today at 09:05:08 AM

New 17 Brew Crew collaboration beer? by newf84
Today at 07:50:49 AM

Happy Home Brew Wednesday 2-21-18 by combat32
February 22, 2018, 03:50:45 PM

Lemon mead update by StickyTentacles
February 22, 2018, 02:29:57 PM

youtube brewing channels. by Manbearpig1122334455
February 22, 2018, 02:10:22 AM

How To Install A Weldless Ball Valve Whirlpool Port by Manbearpig1122334455
February 22, 2018, 02:06:36 AM

What's everyone brewing?? by Brew Beerymore
February 21, 2018, 12:14:52 PM

New Member by johnnyingeorgia
February 20, 2018, 12:10:53 AM

cheers bb for the beermail by vic
February 19, 2018, 09:48:28 PM

What are you bottling/kegging? by Brew Beerymore
February 19, 2018, 02:18:56 PM

BB's Ginger Beer by Brew Beerymore
February 14, 2018, 04:09:40 AM

Brewing with Breakfast Cereal? by Brew Beerymore
February 12, 2018, 08:34:19 AM

dry hop scum by BuddhaNole
February 12, 2018, 08:10:36 AM

What was and still is your favorite music? by Playground
February 12, 2018, 02:47:39 AM

Robobrew in the States by Playground
February 09, 2018, 12:17:47 PM

New to 17 by Brew Beerymore
February 09, 2018, 04:46:56 AM

Expired coopers canned malt kit by Brew Beerymore
February 08, 2018, 07:39:50 AM

Brewing thoughts by Trurobrew
February 07, 2018, 10:35:24 PM

Sediment in the fermenter after 14 hours by Brew Beerymore
February 07, 2018, 06:11:54 AM

Whirlpool/ aeration paddle? by Jazper_86
February 06, 2018, 01:48:16 AM

Hop shot by Playground
February 05, 2018, 10:03:54 PM

How do you make your starter? by Hobrr
February 05, 2018, 04:37:14 PM

post some funny beer photos by combat32
February 03, 2018, 04:12:32 PM

Vinkällaren Red Wine kit by Brew Beerymore
February 03, 2018, 11:08:44 AM

Coopers have a white wine smell/taste? by BDRJ
February 01, 2018, 07:30:25 PM

Computer problems!!! by johnnyingeorgia
February 01, 2018, 06:54:54 PM

Supply buying addiction by combat32
January 31, 2018, 09:16:47 PM

Is this brew okay, for my next brew? by Jazper_86
January 31, 2018, 10:13:18 AM

Confessions of an impatient first time brewer! by Macdonald
January 31, 2018, 08:39:53 AM

New to the forum by Macdonald
January 31, 2018, 08:36:42 AM

English Bitter revisited by rustcp
January 29, 2018, 08:19:12 PM

Double mashed Imperial Stout by StickyTentacles
January 27, 2018, 11:47:38 AM

Mangrove Jack's Lucky Pale Ale review by revolutionarybrewer
January 27, 2018, 08:51:30 AM

Mangrove Jack - Northern Bitter by revolutionarybrewer
January 27, 2018, 08:49:16 AM

Preparing yeast by combat32
January 25, 2018, 10:25:32 AM

Priming - Batch priming Coopers by Playground
January 23, 2018, 11:14:31 AM

Azacca Hops by Playground
January 22, 2018, 01:32:13 PM

Does this recipe look good? by Jazper_86
January 22, 2018, 12:07:05 PM

BBQ chips for oak flavoring?? by combat32
January 21, 2018, 08:23:40 AM

What's up!! by johnnyingeorgia
January 21, 2018, 01:35:26 AM

Grain mill adjustment. by Jaymcmlxx
January 20, 2018, 09:13:26 PM

MOVED: Coopers have a white wine smell/taste? by combat32
January 19, 2018, 05:55:58 PM

Many thanks to Aussie brew brothers CZ,,,VIC,,,,TAS,,,ANDDDDDDDPHIL by Brew Beerymore
January 19, 2018, 08:41:37 AM

Update on porter abv getting ready to bottle by Hplovecraft07
January 19, 2018, 08:12:41 AM

New to this forum, been around a while though by Hobrr
January 16, 2018, 01:46:48 PM

New Guy to the forum by BuddhaNole
January 16, 2018, 09:11:06 AM

Finally got around to registering here by Brew Beerymore
January 16, 2018, 03:32:29 AM

How Long? by Brew Beerymore
January 16, 2018, 03:00:03 AM

Muntons Old conkerwood black ale by Hobrr
January 14, 2018, 01:01:35 PM

Sediment in the fermenter after 14hours by Hobrr
January 14, 2018, 05:46:43 AM

029 Kolsch yeast by Stivius
January 12, 2018, 05:16:51 PM

Powered by EzPortal