+- +-

+-User

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

+-Gallery

Shoutbox

combat32 says: Happy Fathers day
HarryL16 says: ATTN: All Australians. Dan Murphy's now stocks both Ballast Point's Sculpin IPA and Grapefruit Sculpin. Definitely worth a pick up :)
combat32 says: Happy 10 years Craig
combat32 says: Happy Mothers Day to all the moms out there.
17
BrewTubeUK says: So, how does this shout box thing work...   oh, I see
says: still makes me laugh  ;D  http://17crew.com/forums/index.php?topic=1344.0
combat32 says: Happy National Beer day
vic says: yo hoho and a bottle of rum.
says: The next morning I've got empty bottle Rum, Oh my Head :o
says: Drinking Lamb's Rum and Coca-Cola :o Over and Out

+-Top Posters

vic
Posts: 3167
combat32
Posts: 2676
CorronZenith
Posts: 2579
Greedy Dragon Brewing
Posts: 2474
DamoNinja
Posts: 2333

Author Topic: Hot Side Aeration  (Read 3235 times)

arrogantbastardale

  • Master Brewer
  • Hero Member

  • Offline
  • *****

  • 548
    • 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
  • *****

  • 548
    • 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

What's everyone brewing?? by combat32
Today at 03:38:22 PM

Cooling chamber by combat32
Today at 03:21:00 PM

First try at a cider by combat32
Today at 12:54:10 PM

17 Cream Ale ingredients!! by Jaymcmlxx
Today at 08:24:27 AM

Pellet hops by newf84
June 28, 2016, 07:22:01 PM

Coopers IPA silly question by DamoNinja
June 28, 2016, 07:19:50 PM

Your latest home brew purchase by ryan88dozer
June 28, 2016, 07:19:03 PM

What did you just pour? New Thread by ryan88dozer
June 28, 2016, 06:56:08 PM

Coopers kitchen micro pub by eggy79
June 28, 2016, 05:30:58 PM

17 cream ale video by Rayner585
June 28, 2016, 05:26:33 PM

MOVED: iv screwed my Guinness for St Patrick's day :( by combat32
June 28, 2016, 11:07:39 AM

MOVED: Bandaid taste grrrrr by combat32
June 28, 2016, 11:03:24 AM

MOVED: rotten egg smell by combat32
June 28, 2016, 11:02:51 AM

How to brew - Is my beer ruined? Common off flavors by DamoNinja
June 28, 2016, 10:01:08 AM

Hopback, HopRocket or a Hop Randall? by BuddhaNole
June 28, 2016, 09:50:08 AM

How to tell if fermentation is done? by gustavinho202
June 27, 2016, 08:28:23 PM

Just a bit of bottling by combat32
June 27, 2016, 06:27:58 PM

Beerman Home Workout 3-day Split Routine by LesWaller
June 27, 2016, 03:27:08 PM

How long can you leave bottled beer out of refrigeration after bottling it by CraigTube
June 27, 2016, 01:41:13 PM

Using Light Brown Sugar instead of Brewers Sugar by CraigTube
June 27, 2016, 12:11:19 PM

All grain mistake by nomorglf3
June 26, 2016, 08:15:25 PM

SUPER CHEAP AND GOOD TASTING BEER RECIPE?????? by DamoNinja
June 26, 2016, 02:41:08 AM

Looking for free hop rhizomes by Mchops
June 25, 2016, 08:08:58 PM

Cheap Home brew bottles by DamoNinja
June 25, 2016, 09:23:10 AM

Hello from Montreal by CorronZenith
June 24, 2016, 02:53:51 AM

the MACHINIST (in honour of JayMCMLXX) by newf84
June 23, 2016, 07:52:38 PM

Best way to store fermented beer if bottling is delayed by DamoNinja
June 23, 2016, 07:48:42 PM

Carbonation Drops And Bulk Priming by Rayner585
June 23, 2016, 01:38:37 PM

Youtube Brewers by Ouroboros
June 23, 2016, 12:09:00 AM

Hi from Moultrie GA by mark stephenson
June 22, 2016, 08:48:55 PM

Heating your beer by chunk1724
June 21, 2016, 04:45:02 PM

Kegging by CraigTube
June 21, 2016, 09:35:51 AM

Fermentable sugars in coopers can & brew enhancer by CraigTube
June 21, 2016, 09:20:16 AM

2 weeks and still cloudy with floaters by combat32
June 21, 2016, 08:11:41 AM

Bottle Conditioning Questions by combat32
June 20, 2016, 09:44:05 AM

rotten egg smell by arrogantbastardale
June 20, 2016, 04:42:31 AM

How to change the taste of a Coopers lager by DougO
June 19, 2016, 04:16:03 PM

Coopers "session IPA" recipe by HarryL16
June 19, 2016, 03:29:48 AM

using Chocolate to make chocolate stout by smokering
June 18, 2016, 11:21:41 PM

Camp Brew 'generic red ale' by LancashireLass
June 18, 2016, 02:35:40 PM

Coconuts?! by monkeymullins
June 18, 2016, 01:48:27 PM

Get oaked by combat32
June 17, 2016, 09:30:35 AM

Hop Hash?? by Ohio Grassman
June 15, 2016, 11:11:21 PM

Cerveza, Pale Ale and Cream Ale Homebrew by HighlandMedia
June 15, 2016, 03:15:38 PM

Homebrew Wednesday # 17 - Mighty fine mead!! by StickyTentacles
June 15, 2016, 01:01:54 PM

Joe's Ancient Orange Mead by StickyTentacles
June 15, 2016, 01:00:52 PM

Extract kit boil volume question by 77Trev
June 14, 2016, 08:14:53 AM

Top harvesting yeast by BuddhaNole
June 14, 2016, 08:00:29 AM

New coopers kits by CrookedTail
June 14, 2016, 04:53:38 AM

What is 17? by combat32
June 13, 2016, 08:19:05 PM

Stuff that makes me cry by newf84
June 13, 2016, 06:49:13 PM

GrainFather? by combat32
June 13, 2016, 02:45:28 PM

Hello from Grand Rapids, MICHIGAN (Beer City USA) by Da Yooper
June 11, 2016, 08:57:20 PM

Hello From Smiths Falls Ontario !!! by SirOutlaw
June 11, 2016, 07:15:32 PM

Renewed interest in brewing by datholen
June 11, 2016, 04:29:38 PM

Powered by EzPortal