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Old 01-18-2013, 10:40 PM   #11
ajdelange
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Originally Posted by Kaiser View Post
interestingly enough a lower mas pH may actually cause the yeast to have more trouble lowering the beer pH. This is due to increased phytase activity which increased the buffer capacity of the wort, so I have read.
I guess the idea would be that increased phytase activity would release more inorganic phosphate. Certainly mash at lower pH can hold more inorganic phosphate but the buffering capacity doesn't appear to change much. Mash at pH 5.3 saturated with respect to calcium and phosphate has a buffering capacity of 4 ppm as CaCO3 from the phosphate species. At pH 5.6 it can only hold half the phosphate but the buffering capacity only drops to 3.5. Never thought about this.


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Old 01-19-2013, 03:56 AM   #12
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It was in Kolbach's paper that you translated and I proofread. http://wetnewf.org/Brewing_articles/KolbachPaper.pdf page 6 paragraph 5

I did come across this some other place so it stuck in my head. But that't not something I want to bring up out of context since mash chemistry is confusing enough and this idea throws in a wrench, at least at the 1st order of abstraction.

But this is the Science forum.

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