D-brewmeister
Well-Known Member
So here's a technique I was mulling over this morning (sorry its a bit long, it must be the English major in me coming out!):
I have heard from several sources that you can perpetuate a yeast culture using the trub cake from your primary fermenter (i.e. by throwing a new batch of wort right on top of the old cake, or by shaking water with the trub to loosen and re-using [perhaps washing] that slurry). I am leery of this practice for two reasons: 1. I would be concerned about unpredictable hop/yeast/gunk flavors influencing subsequent batches, especialy if they were very different recipes. 2. Since I want to preserve the original characteristics of a given variety of yeast, I imagine that the fewer generations of yeast reproduction between the original smack pack and the current brew, the better (and the less chance for mutated strains to take hold). I am no micro-biologist, and have no idea how many generations occur during primary fermentation, but I bet it is a bunch.
So, I thought that a better way to stretch a given yeast culture over several batches would be through a process I would call "Starter Culture Continuation." And the process I would use for this would be as follows:
1. Shell out your hard earned dough for one of those Wyeast smack packs (Or any liquid yeast for that matter).
2. Smack it, warm it, whatever you do to prepare it (Soak it if it is dried yeast).
3. Boil up a pint or so of water and DME.
4. Put that mini-wort into a sterilized yeast starter jar (I use a 24 oz. Pomegranate jar w/ airlock) and cool to 75*.
5. When the Smack pack is bulging, pitch it into the starter jar.
6. Wait till the starter seems to be going pretty good.
7. Brew up your batch of beer, and prepare it for pitching (cool it to 75*).
8. Pitch about 2/3 of your starter into the main batch.
9. Now here you have a choice of actions, depending on if you want to use that same yeast culture for the next batch, or if you would prefer to save it for a later batch. If the former you would probably leave it in the starter jar as it is, and stick the whole thing in the fridge. And when you are ready to start your next batch, pull it out in advance, warm it to room temp, boil 12oz. of water and DME, cool it, and add it to the starter jar. Then you would start over with step 6 above.
If you wanted to save the yeast culture for a later batch, I would just pour the remaining 1/3 of the starter into a sterilized beer bottle, cap it, and stick it in your fridge. Then, when you want to brew with that yeast again, I would pull it in advance to warm to room temp, and start over with step 3 above, except you would only boil 12 oz of starter wort (since you should already have 4 oz. of starter from last batch), and at step 5 you would pitch the old starter from the bottle instead of a new yeast pack.
So there it is. You should get the benefits of pitching a larger, more active yeast starter than you would if you just pitched a smack pack, you don't have to blow 5-6 bucks on every batch, and you should be able to preserve the integrity and characteristics of the original yeast (for at least a few cycles).
But just a disclaimer -- I haven't tried this yet!! (I intend to with my next yeast purchase) And I would LOVE to hear what you think of the idea, wheather or not you have tried something similar in the past.
Thanks for your indulgence - D.
I have heard from several sources that you can perpetuate a yeast culture using the trub cake from your primary fermenter (i.e. by throwing a new batch of wort right on top of the old cake, or by shaking water with the trub to loosen and re-using [perhaps washing] that slurry). I am leery of this practice for two reasons: 1. I would be concerned about unpredictable hop/yeast/gunk flavors influencing subsequent batches, especialy if they were very different recipes. 2. Since I want to preserve the original characteristics of a given variety of yeast, I imagine that the fewer generations of yeast reproduction between the original smack pack and the current brew, the better (and the less chance for mutated strains to take hold). I am no micro-biologist, and have no idea how many generations occur during primary fermentation, but I bet it is a bunch.
So, I thought that a better way to stretch a given yeast culture over several batches would be through a process I would call "Starter Culture Continuation." And the process I would use for this would be as follows:
1. Shell out your hard earned dough for one of those Wyeast smack packs (Or any liquid yeast for that matter).
2. Smack it, warm it, whatever you do to prepare it (Soak it if it is dried yeast).
3. Boil up a pint or so of water and DME.
4. Put that mini-wort into a sterilized yeast starter jar (I use a 24 oz. Pomegranate jar w/ airlock) and cool to 75*.
5. When the Smack pack is bulging, pitch it into the starter jar.
6. Wait till the starter seems to be going pretty good.
7. Brew up your batch of beer, and prepare it for pitching (cool it to 75*).
8. Pitch about 2/3 of your starter into the main batch.
9. Now here you have a choice of actions, depending on if you want to use that same yeast culture for the next batch, or if you would prefer to save it for a later batch. If the former you would probably leave it in the starter jar as it is, and stick the whole thing in the fridge. And when you are ready to start your next batch, pull it out in advance, warm it to room temp, boil 12oz. of water and DME, cool it, and add it to the starter jar. Then you would start over with step 6 above.
If you wanted to save the yeast culture for a later batch, I would just pour the remaining 1/3 of the starter into a sterilized beer bottle, cap it, and stick it in your fridge. Then, when you want to brew with that yeast again, I would pull it in advance to warm to room temp, and start over with step 3 above, except you would only boil 12 oz of starter wort (since you should already have 4 oz. of starter from last batch), and at step 5 you would pitch the old starter from the bottle instead of a new yeast pack.
So there it is. You should get the benefits of pitching a larger, more active yeast starter than you would if you just pitched a smack pack, you don't have to blow 5-6 bucks on every batch, and you should be able to preserve the integrity and characteristics of the original yeast (for at least a few cycles).
But just a disclaimer -- I haven't tried this yet!! (I intend to with my next yeast purchase) And I would LOVE to hear what you think of the idea, wheather or not you have tried something similar in the past.
Thanks for your indulgence - D.