PetterL
Norbrygg-medlem
Forvirringen i artikkelen jeg linket til kommer fra data fra John Palmer.
Understreket er referanser, det på motsatt side er forenklet lagt til eller trukket fra 0,25pH som også forklares i artikkelen.
Understreket er referanser, det på motsatt side er forenklet lagt til eller trukket fra 0,25pH som også forklares i artikkelen.
John Palmer was cited in two of the emails that we received at BYO, so I dropped John an email and followed up with a phone call to make sure I was understanding his views. John sent me a presentation he gives about brewing water, “Putting Brewing Water in Perspective”, as a reference.
In this presentation, Palmer cites mash pH ranges in the literature referenced to mash temperature (Bamforth and Briggs), and also cites a pH range in the literature referenced to room temperature (Kunze). He uses a temperature offset of pH 0.25 (more on that later), as opposed to the 0.35 offset from Malting and Brewing Science. Here is a summary of what Palmer reports for the best pH range for optimal extract yield, by source (the range from my answer in question is included in for comparison), and with Palmer’s 0.25 offset included:
Bamforth’s range is: 5.3 to 5.8 (mashtemp) / 5.55 to 6.05 (room temp)
Briggs’ range is: 5.2 to 5.4 (mash temp) / 5.45 to 5.65 (room temp)
Kunze’s range is: 5.25 to 5.35 (mash temp) / 5.5 to 5.6 (room temp)
The Kunze temperature reference is anecdotal because his textbook does not reference temperature, and Palmer bases his temperature reference on a conversation he had with Dr. Ludwig Narziss (Weihenstephan Center of Life and Food Science’s former head of brewing science for over 40 years).