+- +-

+-User

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

+-Gallery

Shoutbox

steamyb says: Any US brewers willing to pick-up 2 AB 15 gallon kegs for $60 in NC to make into Keggles and finish your 3 vessel brewery? Tops are still in them, PM me & bring cash! 17!
creamofwheatcs says: 8)
steamyb says: Pretty good reason to register, don't cha think?
DamoNinja says: guests can't use the chatterbox :)
steamyb says: Logged in and 104 guests and 7 users? Why not join the conversation?
CorronZenith says: Yes! Celebrate the yeast and treat them with respect – May we forever reap the benefits of their malt fuelled flatulence and excrement! Thank God for gloriously tasting by-products! And thank God for Yeast! We salute you!
steamyb says: Since I only 'check-in' occasionally, I just wanted to welcome all the new folks from all over the world. My only advice would be sanitize and have patience. Beer is easy- the yeast do the work! 17! & Welcome!
newf84 says: Happy 4th of July !!!
combat32 says: Happy Fourth of July!!
combat32 says: Happy Fathers day

+-Top Posters

vic
Posts: 3265
combat32
Posts: 2861
CorronZenith
Posts: 2614
DamoNinja
Posts: 2531
Greedy Dragon Brewing
Posts: 2493

Author Topic: Hot Side Aeration  (Read 3388 times)

arrogantbastardale

  • Master Brewer
  • Hero Member

  • Offline
  • *****

  • 571
    • 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
  • *****

  • 571
    • 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

Completed first BIAB session and have questions by Gunnibrewer
August 28, 2016, 10:10:31 PM

Frozen beer! by Gunnibrewer
August 28, 2016, 10:02:57 PM

Brewing with harvested yeast VIDEO, from start to finish! by Playground
August 28, 2016, 07:29:23 PM

Been a while since I posted but I have some updates! by MWKilduff
August 28, 2016, 07:06:06 PM

Just made a 5 1/2 Gallon batch of Cider and Mead by MWKilduff
August 28, 2016, 05:21:31 PM

Pumpkin Ale recipe by hobgoblin
August 28, 2016, 02:47:55 PM

What did you just pour? New Thread by ryan88dozer
August 27, 2016, 11:38:07 PM

Beer mail tasting by vic
August 27, 2016, 07:16:31 PM

"THAT WON'T WORK!" RV Brewing Part #3 by vic
August 27, 2016, 06:55:08 PM

Gas and Liquid lines? by HarryL16
August 27, 2016, 08:06:31 AM

Homebrew Alchemist by hobgoblin
August 27, 2016, 05:37:04 AM

Your latest home brew purchase by ryan88dozer
August 26, 2016, 08:15:30 PM

Noob move...scared by vic
August 26, 2016, 06:30:25 PM

How to change the taste of a Coopers lager by DougO
August 26, 2016, 04:02:59 PM

A Celebration to strat 17 Brew? by vic
August 26, 2016, 03:05:23 AM

Mead by CorronZenith
August 26, 2016, 02:06:29 AM

CO2 Blanket Myth by DamoNinja
August 26, 2016, 12:05:28 AM

What is a good serving temp in a keezer? by ryan88dozer
August 25, 2016, 08:20:18 PM

MOVED: Spigot Seal drip? normal or something to be worried about by DamoNinja
August 25, 2016, 06:58:34 PM

MOVED: 3.2 cu mini fridge Fermentation Chamber? by DamoNinja
August 25, 2016, 06:58:31 PM

3.2 cu mini fridge Fermentation Chamber? by DamoNinja
August 25, 2016, 06:56:00 PM

What's everyone brewing?? by HarryL16
August 25, 2016, 02:53:14 AM

Spigot Seal drip? normal or something to be worried about by creamofwheatcs
August 24, 2016, 08:57:01 PM

bought new things by combat32
August 24, 2016, 08:55:47 PM

Plum wine... by froglet
August 24, 2016, 07:56:41 AM

First eBIAB/no chill observations by arrogantbastardale
August 24, 2016, 12:10:31 AM

well i started getting all i need for blackdogs pumpkin ale by combat32
August 23, 2016, 11:52:17 AM

Renewed interest in brewing by datholen
August 22, 2016, 04:48:12 PM

my next brew by hobgoblin
August 22, 2016, 07:03:03 AM

Old Fashioned bourbon barrel ale by Playground
August 21, 2016, 08:35:07 PM

What are you smoking or Bbqueing ? by DamoNinja
August 21, 2016, 07:05:10 PM

Source for Kegs? by combat32
August 21, 2016, 04:28:49 PM

a complaint about sjpor and craig by Ouroboros
August 21, 2016, 06:09:45 AM

Freezer recommendations by Playground
August 20, 2016, 12:22:14 PM

Stove Top Wort Chiller Recommendations by DamoNinja
August 19, 2016, 10:05:46 PM

Fruit to Gallon Ratio's by froglet
August 19, 2016, 01:39:00 PM

17 Cream Ale ingredients!! by SirOutlaw
August 18, 2016, 09:16:37 PM

Yeast Flavs and Taste by newf84
August 18, 2016, 09:05:43 PM

BIAB Kettle Upgrade by DamoNinja
August 17, 2016, 08:24:52 AM

Hipsters Love Craft Beer! by eggy79
August 16, 2016, 09:26:20 PM

American Brown Ale Recipe by creamofwheatcs
August 16, 2016, 09:15:20 PM

Alternative brew by combat32
August 16, 2016, 07:45:07 AM

Smoked oatmeal stout recipe. by howyoubrewin
August 16, 2016, 06:12:19 AM

Coopers IPA mod just checking by newf84
August 15, 2016, 09:48:47 AM

Should I use Starsan in my bottles before bottling? by DamoNinja
August 14, 2016, 08:55:05 PM

Cayenne Pickles by brew22beerco
August 13, 2016, 04:19:52 PM

Saison question by ryan88dozer
August 13, 2016, 02:52:33 PM

tap running slow? by newf84
August 13, 2016, 10:21:37 AM

Anyone Need a Yeast Starter? by steamyb
August 12, 2016, 09:10:14 PM

New Pineapple Wine by Dark_Loki
August 12, 2016, 06:26:57 PM

Nub Cakes from Australia by ror
August 12, 2016, 07:54:24 AM

Modified Coopers Irish Stout by Ouroboros
August 12, 2016, 04:43:27 AM

Mistake or not? by vic
August 11, 2016, 08:23:04 PM

Choc Vanilla Milk Stout Recipe Critique by creamofwheatcs
August 11, 2016, 08:33:09 AM

Stratosphere IPA - All Grain by reval8r
August 10, 2016, 04:48:11 PM

Powered by EzPortal