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.