General Category > Yeast and Fermentation

Weirdness with Repitched 1214

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a10t2:
Looking for some input from anyone with experience with this strain (Chimay's, allegedly).

Twice now I've brewed a low-gravity Blond and harvested the yeast for a higher-gravity beer. The first was a Tripel at 18.3P that stalled at SG >1.040 (as high as my hydrometer reads). I didn't have time to deal with it and dumped it. Last weekend I brewed a Dubbel (18.0P) that appeared to stop fermenting within the first day. This morning, five days in, same thing: SG >1.040. I've been agitating the fermenter a couple times a day but it doesn't seem to be doing anything.

I'll probably get a 1272 starter going and pitch it to finish off the Dubbel, but what I'm really wondering is if this is normal behavior for 1214. The only thing I can think of is that both beers had a fair amount of simple sugars (22% of extract in the Tripel, 11% in the Dubbel) and that the yeast is flocculating out before it gets to the maltose. The two batches of Blond (10% sugar) attenuated normally though. The Dubbel may have been slightly under-pitched, but the Tripel was racked onto an entire yeast cake.

kylekohlmorgen:
How are you harvesting the yeast? Just dumping the wort onto it or are you rinsing/storing/refrigerating etc.?

Did you use a blow-off tube for the Blonds?

Did you add yeast nutrient to both the blond and the bigger beer? That was my first thought, especially since both beers had simple sugars, and more so in the 2nd, higher-gravity wort.

FWIW - I just repitched 1214 slurry from a 10% Quad and it fermented properly. This yeast is normally a trooper, that's why I'm interested in getting to the bottom of it.

a10t2:
The Tripel was racked right onto the yeast in the fermenter. The slurry for the Dubbel was refrigerated overnight, then I decanted as much beer off as I could, re-suspended the slurry, and pitched a more or less appropriate volume (160 mL of medium-thin slurry).

No blow-off tubes, no yeast nutrients in any of the beers. I should also have mentioned that only the first Blond was brewed from a smack pack - the second was stored slurry built up in a starter, and attenuated normally.

kylekohlmorgen:
I'll bet the yeast didn't finish because they were low on nutrients.

With the tripel, even though you over-pitched, the small amount of nutrient from the malt was divided amongst a large quantity of yeast. That yeast was probably already low on nutrient from fermenting the blond.

a10t2:

--- Quote from: kylekohlmorgen on October 26, 2012, 12:21:41 PM ---I'll bet the yeast didn't finish because they were low on nutrients.
--- End quote ---

I guess that's a possibility, but it doesn't seem likely to me. Even if reducing the nutrient levels by 10% were enough to cross some sort of threshold, wouldn't the second batch of Blond have been a nearly identical situation?

I've done the Blond-to-Tripel progression using 3787 without issue, so it has to be something specific to 1214.

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