Do you think that Starsan might contibute to oxidation in kegs?

[FireDancer]

If you happen to have two kegs and a few empty bottles for the next time, it would be a good experiment to do all three processes (Keg with starsan, bottle & keg with iodophor) in parallel with the same fermented beer. Yeah probably too much fuss, but seeing that you are trouble shooting to find something that is driving you crazy, you might try it.

I'd be interested to follow along. Good luck.

 

[BrookdaleBrew]

Two batches, back to back, bottle conditioned and bottles sanitized with iodophor. No noticeable oxidation. Dunkelweizen on the keg, sanitized with starsan. I let this one age a bit in the kegerator sans gas, but did purge it prior to fill. I can taste oxidation. I know I introduced another variable by not immediately carbonating. Still working on it. This is driving me crazy. Next step is iodophor, carbonate immediately. I'll report back.

Are you naturally carbonating in the keg or are you carbing with gas? Personally, I think the natural carbonation process reduces the chances of oxidation being a problem.

 

[Reelale]

If you happen to have two kegs and a few empty bottles for the next time, it would be a good experiment to do all three processes (Keg with starsan, bottle & keg with iodophor) in parallel with the same fermented beer. Yeah probably too much fuss, but seeing that you are trouble shooting to find something that is driving you crazy, you might try it.

I'd be interested to follow along. Good luck.

I'm open to all recommendations at this point.

Are you naturally carbonating in the keg or are you carbing with gas? Personally, I think the natural carbonation process reduces the chances of oxidation being a problem.

I'm force carbing with and purging. I don't see the difference in relation to my problem though.

 

[BrookdaleBrew]

I'm force carbing with and purging. I don't see the difference in relation to my problem though.

When you carb naturally, you have another fermentation that takes place within the bottle/keg. Yeasts use O2 to reproduce before fermentation. Carbonating naturally can scrub O2 from your beer.

Try naturally carbonating one of your kegs and see if you have the same problem.

 

[Reelale]

When you carb naturally, you have another fermentation that takes place within the bottle/keg. Yeasts use O2 to reproduce before fermentation. Carbonating naturally can scrub O2 from your beer.

Try naturally carbonating one of your kegs and see if you have the same problem.

Ah...makes sense now. I'll try this next one.

 

[Houblon]

Heres a crazy idea, but when your sanitizing the keg hook up the gas to the outlet and make CO2 filled bubbles, as the foam rises it purges the keg from bottom up.


I posted about this before revvy & his fanboys got all worked up and thought it was foolish.
> Posted by Revvy:
because, quite frankly it's not really necessary.

https://www.homebrewtalk.com/f163/purging-secondary-156065/

Not so foolish is it? spend all that time - money only to get oxidation in the beer.

 

[remilard]

When you carb naturally, you have another fermentation that takes place within the bottle/keg. Yeasts use O2 to reproduce before fermentation. Carbonating naturally can scrub O2 from your beer.

Try naturally carbonating one of your kegs and see if you have the same problem.

Yeast don't reproduce if you bottle carb with dextrose or sucrose as you are adding no additional nitrogen. They would if you added malt extract or otherwise added a nitrogen source. Regardless, yeast are reductive whether or not they reproduce. In practice, yeast will reduce about 60% of the oxygen in the headspace of a bottle. This is why essentially every modern brewery that bottle conditions pre-evacuates the bottles with co2.

 

[jamest22]

The author of this article mentions that many sanitizers are oxidizers, but doesn't say which ones:

"Most sanitizers are oxidizers, making it very important to insure your vessel is dry before you fill it; otherwise residual sanitizer could potentially oxidize your beer. "

http://www.probrewer.com/resources/stupidstuff/cleaning.php