Protein rest?

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Different proteins in the mash need to do their own thing (biochemical reactions); however the optimal temperature for any one particular protein to do its thing is different. So you start low ~100 F and let those proteins work, then you crank up to ~115-125 F and let those proteins work...all the way to 145-160 where you let other proteins work (amylases).

Once you get really hot >180 F - proteins start to denature or unravel and are unable to perform their functions anymore.
 
Kai Troester explains protein rests better than I ever could. I learned decoction mashing from this very video several years ago:





 
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