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You are here: Home --> Forum Home --> General Forum --> Homebrewing Links --> Aeration xBmt #1

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KidMoxie
Charter Member
San Elijo Hills, CA
405 Posts


Isn't your LHBS MoreBeer? Figured they of all people would give a good crush.




Posted 34 days ago.

ingoogni
nl
314 Posts


"""I guess I am just baffled how, WRT this latest test, we can claim
BOTH: 1. It doesn't matter because of the rest of the process, and 2. it
is encouraging bad practice. I really think it has to be one of those
two, and not really both. Yes, it looks like I could get away without
aeration, IN MY BREWHOUSE, on MY RECIPE, with MY YEAST STARTER PROCESS. """

'Simplified biology' Yeast does about four doublings in a normal fermentation. Well fed yeast can do about four doublings in a non aerated wort, after that there's too little lipids etc left in the cells for a next generation. That though does not mean yeast will instantly stop fermenting. So yes, a simplified conclusion can be "you make good starters".

There are several breweries starting to do this again and in the recent past many smaller German brewers have done so. The reasoning is that if wort is aerated and no yeast is added DO measurements still show a rapid decrease in O2 so the wort "must be oxidising". Downside of this way of working is that you can't directly reuse harvested yeast but always have to make a starter and/or re-aerate the yeast.

The biggest difference in our scale of brewing with 20 - 30 years ago is the preparation of a starter, good quality of nutrients and aerated in the right way during the right time on a stir plate. Aeration of the starter is not about more biomass, more cells, less time, it's mostly about really fit cells. That IMO is the biggest improvement in (home)brewing we had.

Boulton & Quain where the guys that kind of started with aerated starters, read their papers / book / patents and some of the stuff that references and builds on their work.




Posted 34 days ago.

rayfound
Charter Member
Riverside, CA
313 Posts


Morebeer does actually have a great mill/crush. But they are 20+ minutes from here and I have another that is like, 3min. They got a new mill that is BETTER, but I still get a little roller coaster ride of efficiencies... whilst with morebeer (before new shop opened) I was like rock solid predictable. 




Posted 34 days ago.

tracebusta
Charter Member
Somerville, MA
155 Posts


   but I still get a little roller coaster ride of efficiencies

That's what pushed me to getting my own mill. The HBS' mills keep getting jammed, which means they keep moving the rollers which means that I never got the same crush. Now I have the peace of mind knowing that I'll get the same crush over and over. 




Posted 34 days ago.

ingoogni
nl
314 Posts


An interesting read: "The influence of yeast oxygenation prior to brewery fermentation on yeast metabolism and the oxidative stress response"

onlinelibrary.wiley.com/doi/10.1111/j...





Posted 34 days ago.

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