WLP007 problems

[dirtyal]

I had two WLP007 vials shipped to me from the US to Brazil and the yeast keeps throwing a strong banana aroma and flavor. I´ve made a starter and I´ve tried it for 3 generations with this banana ester. All fermentation were temp controlled under 18C.
Is this yeast done or there are something I could try to bring it back?

Tks.

[wwyw]

I had two WLP007 vials shipped to me from the US to Brazil and the yeast keeps throwing a strong banana aroma and flavor. I´ve made a starter and I´ve tried it for 3 generations with this banana ester. All fermentation were temp controlled under 18C.
Is this yeast done or there are something I could try to bring it back?

Tks.

Under-oxygenation will throw off a lot of banana esters I've found, even with a starter and temp control. I had this exact problem (albeit with 550). Are you shaking the shit out of your carboy?

[BDawg]

If that doesn't work, then something happened and the yeast self-selected the cells that throw the esters and killed off the ones that don't. Personally, I'd go with pure 02 for 90 seconds, using a new vial stepped up in a starter. WLP007 is one of my favorite yeasts and never had any issues like you are describing. Don't give up on the strain, it's a great one.

[thatguy314]

007 has very temp dependent esters. I find 68-72 i get more strawberry, i get more pinapple, apple pear at lower temps. If you're higher than that that might also explain banana.

Esters are always a product of growth and temperature. Lower pitching rate, less oxygen, and higher temp favor more esters. Higher pitching rate, more oxygen, and lower temp favor less esters.

[dirtyal]

Tks for all the answers and I will try to use oxigen, which I´ve never done so far and test it again, if it doest work, I will try a new vial of 007.