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Thread: PH/diacetyl

  1. #1
    Join Date
    Nov 2004
    Posts
    6

    PH/diacetyl

    Does wort PH have any effect on the beerīs diacetyl content? Whatīs the mechanism?

    Thanks in advance,
    Pedro

  2. #2
    Join Date
    Nov 2004
    Location
    Boston
    Posts
    6
    High beer pH doesn't cause high diacetyl levels, although the two are often seen together. Rather than one causing the other, they are usually both symptomatic of a microbial contamination...

    Some yeast strains are noted for producing higher diacetyl levels under normal conditions (mostly English ale strains such as Ringwood) but these beers usually have what most would consider normal pH's.

  3. #3
    Join Date
    Oct 2002
    Posts
    11

    Diacetyl

    Diacetyl is a bi-product of the iso-leucene/ valine biosynthetic pathway, and happens in every fermentation.

    Allow for proper time and temperature control during fermentation, and the yeast will further metabolize diacetyl producing 2-3 butanedione which has a much more favorable flavor threshhold.

    Let your yeast attenuate, and don't knock down fermentation temp until the diacetyl is gone. You may even increase the ferm temp about six to seven days into fermentation, expediting the process.

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